Bosch GreenTronic 7000 T Hybrid Electric Water Heater

Installation and Operating Instructions

This document provides comprehensive instructions for the installation and operation of the Bosch GreenTronic 7000 T Hybrid Electric Water Heater. Please read all instructions thoroughly before proceeding.

1 Key to Symbols and Safety Instructions

WARNING: Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

DANGER: Indicates a hazardous situation which, if not avoided, will result in death or serious injury.

CAUTION: Indicates a hazardous situation which, if not avoided, could result in minor to moderate injury.

NOTICE: Used to address practices not related to personal injury.

i (Info symbol): Indicates important information where there is no risk to people or property.

Safety Precautions:

Installation and service must be performed by a qualified installer or service agency.
Improper installation, adjustment, alteration, service or maintenance can cause injury, death, or property damage.
DO NOT install outdoors. This water heater is certified for indoor installation only.
Water temperature over 120°F (49°C) can cause severe burns instantly or death from scalds. Children, disabled, and elderly are at highest risk.
This appliance shall not be installed in any location where flammable liquids or vapors are stored.
Do not use this water heater if it has damaged wiring or is not working properly.
California Law requires that residential water heaters must be braced, anchored or strapped to resist falling or horizontal displacement due to earthquake motions.

2 Specifications

The following table details the specifications for various Bosch GreenTronic 7000 T models:

Part Number	AHRI Reference	UEF	Nominal Capacity	DOE Rated Storage Volume	First Hour Rating	Recovery Rate (90°F rise)	Water Connections	Max. Water Pressure	Temperature Setpoint Range	Power Supply	Electric Heating Elements	Refrigerant	Compressor Rated Input	Compressor Heating Capacity	Noise Level	Ambient Operation Temperature	Ambient Operation Temperature for Heat Pump	Ingress Protection Rating	Product Dimensions	Product Net Weight	Product Operating Weight	Shipping Dimensions (H x W x D)	Shipping Weight
TR7000T-50US	214838664	3.75	50 Gallon	47 Gallon	69 Gallon	27.5 GPH	3/4" NPT	150 PSI (1.03 Mpa)	109-149 °F (43-65 °C)	208/240VAC, 30A (1Ph 60Hz)	2 x 4,500 W	R134a	408 W	1,593 W	< 50 dB(A)	5-115 °F (-15-46°C)	37-109°F (3-43°C)	IP21	66½" x 21 3/4"	218 lbs	609 lbs	75" x 28 3/4" x 27 1/2"	265 lbs
TR7000T-50CA	214838665	3.90	65 Gallon	60 Gallon	80 Gallon	27.5 GPH	3/4" NPT	150 PSI (1.03 Mpa)	109-149 °F (43-65 °C)	208/240VAC, 30A (1Ph 60Hz)	2 x 4,500 W	R134a	408 W	1,593 W	< 50 dB(A)	5-115 °F (-15-46°C)	37-109°F (3-43°C)	IP21	65 3/4" x 25 3/4"	271 lbs	771 lbs	75 1/2" x 30 " x 29"	335 lbs
TR7000T-65US	216018259	4.00	80 Gallon	74 Gallon	91 Gallon	27.5 GPH	3/4" NPT	150 PSI (1.03 Mpa)	109-149 °F (43-65 °C)	208/240VAC, 30A (1Ph 60Hz)	2 x 4,500 W	R134a	408 W	1,593 W	< 50 dB(A)	5-115 °F (-15-46°C)	37-109°F (3-43°C)	IP21	74½" x 25 3/4"	293 lbs	909 lbs	79 ½" x 30 " x 29"	360 lbs
TR7000T-65CA	216018258
TR7000T-80US	214838666
TR7000T-80CA	214838667

3 Dimensions

Refer to the diagram for dimension labels A through J.

Model Number	Height (A)	Diameter (B)	Electrical Knockout (C)	Condensate Drain (D)*	T&P Relief Valve (E)	Hot Water Outlet (F)	Cold Water Inlet (G)	Drain Valve (H)	Lower Heating Element (J)
TR7000T-50US TR7000T-50CA	66½" (169 cm)	21 3/4" (56cm)	53½" (136 cm)	49½" (126cm)	39 3/4" (101 cm)	39 3/4" (101 cm)	5½" (14 cm)	5½" (14 cm)	14" (36 cm)
TR7000T-65US TR7000T-65CA	65 3/4" (167 cm)	25 3/4" (66 cm)	52 3/4" (134 cm)	48 3/4" (124 cm)	37 3/4" (96 cm)	37 3/4" (96 cm)	5½" (14 cm)	5½" (14 cm)	13 ½" (34 cm)
TR7000T-80US TR7000T-80CA	74½" (190 cm)	25 3/4" (66 cm)	61½" (157cm)	57½" (146 cm)	46 3/4" (119 cm)	46 3/4" (119 cm)	5½" (14cm)	5½" (14 cm)	12" (31 cm)

* Not visible from the front of the water heater.

4 Getting Started

4.1 Location

WARNING: Fire, explosion! Areas where flammable liquids are stored may not be suitable. Never store or use flammable substances in the same room or area containing an electric water heater.

WARNING: Personal injury, product damage, property damage! Indoor installation only. Do not install outside.

i Local codes and requirements may require the water heater to be installed with the bottom heating element elevated at least 18 inches from the floor.

Install the water heater in a clean, dry location with an ambient temperature always above freezing. Position it close to major hot water usage points. Ensure all electrical controls, air filter, heating elements, drain valve, and water connections are accessible for servicing. Increased top clearance is recommended for easier servicing of the anode rod.

For optimal efficiency, the ambient temperature should be between 37°F (3°C) and 109°F (43°C) to ensure heat pump operation.

The water heater operates below 49dB(A), comparable to a quiet refrigerator.

4.2 Air Flow Requirements

The water heater uses ambient air for heating. A minimum enclosed space of 700 ft³ (19.8 m³) is required. Insufficient airflow can lead to increased usage of electric heating elements and reduced efficiency.

Consider louvered door options or ducting the air flow if the space is smaller than 700 ft³.

Air Flow Opening	Ducting	Minimum Installation Space Requirement (ft³)
Enclosed room	none	700 (19.8 m3)
Fully louvered door or upper & lower louvers in door or upper louver with undercut door	none	84 (2.4 m3)

Table 5 Air Flow Options and Space Requirements

Air Flow Opening	Ducting	Minimum Installation Space Requirement (ft³)
Upper louver OR undercut door	Inlet OR outlet	None	84 (2.4 m3)

Table 7 Air Flow Options and Space Requirements

Air Flow Opening	Ducting	Minimum Installation Space Requirement (ft³)
None	Inlet AND outlet	None	84 (2.4 m3)

Table 8 Air Flow Options and Space Requirements

Required Clearance for Operation	Required Clearance for Service
Air Exhaust	6" (15.3 cm)	6" (15.3 cm)
Top	20" (51 cm)	50 Gallon: 25.5" (65 cm) 65 Gallon: 25.5" (65 cm) 80 Gallon: 32" (81.3 cm)

Table 4 Required Minimum Clearances

Table 6 Required Minimum Clearances

4.3 Electrical Requirements

Hardwire the water heater per local codes.

Electrical Requirements	Value
Required breaker size:	208V/240V (60Hz) 30A double pole breaker
Required wiring gauge:	10 AWG

Table 9 Electrical Requirements

i Power supply for a condensate pump is not supplied from the water heater.

4.4 Draining Requirements

NOTICE: Property damage! Locate the water heater where leaks will not cause damage. A drain pan with a minimum depth of 2 inches and dimensions at least 2 inches greater than the water heater diameter is recommended and should be piped to a drain.

4.4.1 Drain Pan Installation

A drain pan is recommended, especially if leaks could cause substantial damage. Code may require it.

Water Heater Size	Minimum Required Drain Pan Diameter
50 Gallon	26" (66 cm)
65 Gallon	30" (77 cm)
80 Gallon	30" (77 cm)

Table 10 Minimum Required Drain Pan Diameter

4.4.2 Condensate Drain

The water heater produces condensate during operation that must be drained. Use the supplied 6-foot, 1/2-inch diameter drain hose. A neutralizer is not required.

4.5 Water Chemistry Requirements

NOTICE: Product damage! Chemical imbalance in the water supply can affect efficiency and cause damage. Water quality should be professionally analyzed. Adverse water quality is not covered by warranty.

The water must be potable and free of corrosive chemicals, sand, dirt, and other contaminants. Ensure compliance with EPA secondary maximum contaminant levels (40 CFR Part 143.3). If water contains higher contaminants, treatment is required.

Water Chemistry Parameter	Value
pH	6.5 to 8.5
Hardness	5 to 14 Grain/US Gallon
Chlorine Concentration	≤ 100 ppm
Total Dissolved Solids	≤ 500 ppm
Conductivity µS/cm	≤ 1200

Table 11 Water Chemistry Limits

5 Installation

WARNING: Personal injury, property damage! Install in accordance with all national, state, and local codes. Consult the National Electric Code (NFPA 70) or Canadian Electric Code (CSA22.1) for further information.

Before installation, close the main water supply valve, open a water faucet to relieve pressure, and then close the faucet.

i This water heater is not intended for space heating applications.

5.1 Inspect Shipment

Check packaging for damage. Claims for damage, shortage, or non-delivery must be filed with the carrier immediately.

Do not install if the tilt sensor on the outer packaging has tripped.

5.2 Placing the Water Heater

i Refer to chapter "Getting Started" for location, space, and drain requirements.

Place drain pan.
Lift water heater from the base.
Position water heater to maintain access and clearance requirements.

5.3 Plumbing

i Use dielectric unions to help prevent corrosion and extend the life of the water heater.

Water connections are located on the side. Cold water connection is on the bottom, hot water connection is on the top.

Install unions and shut-off valves for easy servicing. A mixing valve is recommended if not already required by code.

All hook-ups must comply with local codes.

Water supply pressure should not exceed 80% of the water heater's working pressure. If it does, install a pressure limiting valve with a by-pass on the cold water inlet line.

i If the water heater is enrolled in a utility DR program that allows temporary temperature increases, a thermostatic mixing valve certified to ASSE 1017 must be installed.

i Heat cannot be applied directly to water fittings. If using solder connections, solder the pipe to the adapter before attaching to the water heater fittings.

i Always ensure that all fittings are free from leaks.

5.3.1 Closed System / Thermal Expansion

NOTICE: Product damage, property damage! Do not install a check valve or other backflow device that creates a closed system unless required by code, as this may result in discharge due to thermal expansion.

Install a diaphragm-type expansion tank suitable for potable water on the cold water supply line. The expansion tank must have a minimum capacity of 1.5 US gallons for every 50 gallons of stored water.

5.3.2 Relief Valves

WARNING: Personal injury, property damage! The pressure rating of the relief valve must not exceed 150 PSI and must not exceed the water heater's maximum working pressure.

WARNING: Personal injury, property damage! Failure to maintain a listed, adequately sized temperature & pressure relief valve will release the manufacturer from any claim.

The water heater is equipped with a 150 PSI temperature & pressure relief (T&P) valve. Ensure the discharge line is installed correctly, terminating no more than 6 inches above the floor or flood level rim, and does not contact any live electrical part. Local authorities may require a different valve model.

WARNING: Scald hazard, property damage! Discharge lines must be properly installed and piped to an adequate drain. The discharge line must not be capped, blocked, or contain any valve. It must terminate 6 inches above a floor drain and be capable of withstanding 250°F (121°C).

i Excessive length (over 30 feet) or more than four elbows in the discharge line can cause restriction and reduce discharge capacity.

5.3.3 Condensate Drain

The water heater produces condensate during operation. Install the supplied drain pipe to properly drain the condensate. A neutralizer is not required.

5.3.4 Filling the Water Heater

Open all hot water fixtures.
Open the shut-off valve on the cold water inlet and hot water outlet to fill the tank.
Close each hot water outlet as it delivers water free from air.
Check the system for leaks.

5.4 Electrical

5.4.1 Electrical Connections

WARNING: Fire, shock hazard, property damage! Use only the specified electrical supply voltage. Check the data plate for the correct voltage rating. Consult your electrical utility company if you have questions.

WARNING: Hazardous voltage! A qualified electrician is required. Ensure the electrical supply to the water heater is turned OFF before installing electrical wiring.

WARNING: Improper operation! DO NOT ALTER any internal wiring.

NOTICE: Product damage! Ensure the water heater is completely full of water and the cold water inlet valve is open before energizing. Energizing with dry elements will damage them.

Electrical Connections Checklist:

Ensure the electrical supply has proper overload fuse or breaker protection.
Verify wire sizes and connections comply with all applicable codes.
Ensure wiring is enclosed in approved conduit (if required by local codes).
Ensure the water heater and electrical supply are properly grounded.

To connect wiring:

Provide a separate disconnect switch for the water heater.
Open knockout to gain path for wires into the power supply box.
Open the power supply box.
Optional: Remove CTA 2045 port cover and connector for better access to the terminal block.
Pull wires through the knockout and connect wires to the terminal block.
Properly ground the unit.
Close all covers.

WARNING: Shock hazard! Check wire tightness.

5.5 Ducting

i If ducting is installed, adjust F40 setting to 1. Refer to chapter "Advanced Settings".

Check chapter "Air Flow Requirements" if ducting is necessary. Ensure ducting complies with local building and HVAC codes.

This water heater must be ducted separately from other appliances. Use only ducting approved for HVAC applications. Ensure ducting is adequately supported and uses UL Certified terminations.

HVAC approved indoor registers are required. Use rigid ducting, isolated from structural members. Utilize a short section of flexible duct (12" or larger) between the water heater and rigid ducting to minimize vibration or noise. Every foot of flexible ducting counts as three feet of rigid ducting. Ducting must be insulated per HVAC codes.

Cold air exhaust must be away from structures to prevent condensation. Providing warm, moist air is beneficial to performance.

Considerations for duct system planning:

Use direct routes to maximize airflow; minimize elbows/bends.
Utilize the largest duct size possible.
The total length of duct is the sum of inlet and outlet lengths.
Inlet and outlet ducting lengths do not have to be the same.
Elbows, bends, and terminations decrease total allowable ducting length.

Duct Type / Diameter	8"	7"	6"	5"
Rigid	357 ft (109 m)	168 ft (51 m)	68 ft (21 m)	26 ft (7.9 m)
Flexible	131 ft (40 m)	68 ft (21 m)	18 ft (5.5 m)	8 ft (2.4 m)

Table 12 Maximum Total Equivalent Duct Length

5.5.1 Equivalent Feet for Duct Accessories

Elbows/Bends: An elbow is defined as rigid duct with flex bends greater than 45°. Refer to Table 13 for maximum elbows/bends allowed.

Terminations/Registers: Table 13 accounts for equivalent feet for terminations, including rodent screens and duct reducers. Smaller diameter terminations and registers with more than a 2ft (0.6m) connection should not be used.

Damper: An approved damper should be installed no further than 10ft (3m) of rigid ducting from the unit if ducting to the outside using only an exhaust duct. This prevents outside air from entering the living space.

5.5.2 Duct Installation

NOTICE: Product damage! Horizontal termination to the outside is recommended to avoid water entering the unit.

Determine the duct terminal location and create a hole through the exterior wall to accommodate the UL Certified Termination that prevents water entry.

8" Duct Adapters are available with part number 7738007443.

6 Operation

6.1 Safety Precautions

CAUTION: Fire, explosion! Hydrogen gas can be produced in a hot water system that has not been used for two weeks or more. Open a hot water faucet for several minutes before using any electrical appliance connected to the system. Do not have open flame or smoke near any faucet if hydrogen is present.

WARNING: Improper operation! If the water heater has been subjected to fire, flood, or physical damage, disconnect all power. DO NOT operate or attempt to repair the unit until checked by a qualified service technician. It must be replaced if any part has been under water.

Fill water heater completely before supplying power.
If the cold water shut-off valve is closed, DO NOT turn on the water heater.
It is recommended that a qualified person or service technician performs the work.

6.2 End User Operation

6.2.1 Overview of Control

The control panel features a display and buttons for operation. Refer to Figure 8 and Figure 10 for details.

Buttons Overview: Mode, Up, Down, Clock, Copy, Back, Delete, Confirm, On/Off, Operation Light, Demand Response, Child Lock, Electric Elements.
Display Icons Overview: Includes icons for Vacation, HP, DR, HYBRID, SET TEMPERATURE, E-HEATER, ECONOMY, INVALID, HEAT PUMP, Clock, and Day/Week settings.

6.2.2 Turning on the Water Heater

NOTICE: Product damage! Ensure the water heater is filled with water before supplying power. Damage caused by dry firing is not covered by warranty.

To turn on the water heater, supply power and press the On/Off button. The unit may take up to 1 day to reach the target temperature depending on operation conditions and selected mode.

6.2.3 Selecting Operation Mode

The water heater has 5 operation modes: VACATION, HYBRID, E-HEATER, ECONOMY, and HEAT PUMP. ECONOMY is the default mode.

Press the Mode button to cycle through the modes. The Hybrid and E-Heater modes expire after 72 hours and revert to Economy mode.

Operation Mode	Efficiency	Recovery	Remarks
VACATION	N/A	N/A	Maintains tank temperature at 59°F (15°C) for frost protection. Set for 1-360 days.
HYBRID	Low	High	Utilizes heat pump and electric elements. Minimizes recovery time but uses more energy than Economy mode. Active for 72 hours.
E-HEATER	Very Low	Very High	Uses only electric heating elements. Fastest way to heat water. Least economic. Active for 72 hours.
ECONOMY	High	Low	Utilizes heat pump and electric elements. Default mode. Most efficient but takes longer to heat water.
HEAT PUMP	Very High	Very Low	Uses only the heat pump. Most efficient but takes the longest to heat water.

Table 15 Operation modes

6.2.4 Water Temperature Setting

DANGER: Scald hazard! Households with small children, disabled, or elderly persons may require a 120°F (49°C) or lower thermostat setting.

Water temperature can be set between 109-149°F (43-65°C). Lowering the temperature saves energy. Factory settings are 120°F (49°C) for US models and 140°F (60°C) for Canadian models.

Water temperatures above 125°F (52°C) can cause severe burns or death. Read and follow all warnings.

Mixing valves are recommended for reducing point-of-use water temperature. Ensure compliance with ASSE 1017 standards.

To set a new temperature, press the Up or Down button. The new temperature will be saved immediately.

6.2.5 Vacation Mode

The water heater maintains a temperature of 59°F (15°C) in Vacation Mode for frost protection.

To activate: Press the Mode button until VACATION is displayed. Use the Up/Down buttons to set the number of days (1-360). Press Confirm to save.

6.2.6 Schedule

The water heater supports daily and weekly scheduling. To activate scheduling, press the Clock button to toggle between week, day, or schedule off.

i Set up clock and weekday before scheduling. Press and hold the Clock button for 3 seconds. Use Up/Down to select the weekday, then Confirm. Set the time using Up/Down and Confirm.

Weekly Schedule: Allows programming six on/off times for each weekday.

Press Clock until "WEEK" is shown.
Press Confirm to start setting the schedule. Choose day, start time, end time (up to 6 slots per day).
Set operation mode.
Set target temperature.
Use the Copy button to copy the schedule from one day to another.

Daily Schedule: Programs six on/off times that repeat daily.

Press Clock until "DAY" is shown.
Press Confirm to start setting the schedule. Choose start time and end time (up to 6 slots).
Set operation mode.
Set target temperature.

6.2.7 Legionella Protection

This function prevents legionella growth by raising the tank temperature to 140-158°F (60-70°C) for 30 minutes.

DANGER: Scald hazard! Hot water can produce third-degree burns in 6 seconds at 140°F (60°C). A mixing valve must be installed when legionella protection is enabled.

Refer to advanced settings (chapter 6.4.2) for F07, F09, F17, and F26.

6.2.8 Turning Off Water Heater

For extended periods of non-use, consider Vacation Mode. Otherwise:

Turn off the water heater using the On/Off button.
Disconnect power to the water heater.
To prevent freeze damage and/or hydrogen gas buildup, drain the water heater completely by opening the drain valve on the bottom of the unit if leaving it off for an extended period.

6.3 Demand Response

If enrolled in a utility DR program, a thermostatic mixing valve certified to ASSE 1017 must be installed.

The water heater has a demand response port (CTA-2045). Bosch does not supply the UCM module for this port.

When a UCM module is installed, demand response will activate, indicated by "DR" on the display. The DR icon will flash when actively controlled. Press the DR button to interrupt control for up to 72 hours.

6.4 Advanced Options for Technician

6.4.1 Operating Parameters

Press the Settings button to view sensor values and settings. Use the Down button to scroll through parameters.

Item	Description	Unit	Value Expected
EEr	Expansion valve opening	000 format	Variable
EEC	Compressor status	(Status indication)	0 (off) or 1 (on)
PUP	N/A - not available	N/A	N/A
P5	N/A - not available	N/A	N/A
FΓ	Fan type	Binary	1
HΓ	Heating type	Binary	1
Compressor type	Binary	1
F51	N/A - not available	N/A	N/A
S10	Tank capacity	Liters	170 (TR7000T-50CA) 190 (TR7000T-50US) 227 (TR7000T-65CA) 246 (TR7000T-65US) 280(TR7000T-80CA) 300(TR7000T-80US)
P4P	N/A - not available	N/A	N/A
00	Product type	Binary	0 (hybrid electric water heater)
U2	Software version	000 format	Variable
U3	Display software version	000 format	Variable
U4	N/A - not available	N/A	0
U5	N/A - not available	N/A	1
UT	Region	Binary	2
Ег	Error history: Most recent error code	0000 format	Variable
26г	Error history: Second recent error code	0000 format	Variable
36г	Error history: Third recent error code	0000 format	Variable
HHH	Maintenance reminder	Days	Variable
LF	Set point temperature	°F or °C (depends on F01 settings)	Variable
End	End of operating parameters menu	N/A	N/A
TSU	Tank temperature at upper heating element	°F or °C (depends on F01 settings)	Variable
TSL	Tank temperature at lower heating element	°F or °C (depends on F01 settings)	Variable
151	N/A - not available	N/A	N/A
75	Heat pump stop temperature	°C	65 (equals 149 °F)
13	Refrigerant temperature into evaporator	°F or °C (depends on F01 settings)	Variable
36г	Air intake temperature	°F or °C (depends on F01 settings)	Variable
ΓΡ	Refrigerant temperature after compressor	°F or °C (depends on F01 settings)	Variable
ΓΗ	Refrigerant temperature into compressor (suction line)	°F or °C (depends on F01 settings)	Variable
ΓLF	Set point temperature	°F or °C (depends on F01 settings)	Variable
Гег	N/A - not available	N/A	N/A
ΓΓ	Legionella protection set point temperature	°C	65 (equals 149 °F)
CO	Current amperage draw	A	Variable (0-25)
FO	Fan speed	RPM x 10	Variable (0-140)
EO	EPROM	N/A	Variable

Table 16 Operating Parameters

6.4.2 Advanced Settings

WARNING: Improper or dangerous operation! These settings are for qualified installers or service agencies only.

Press the Settings button for more than 3 seconds to enter advanced settings.

Item	Description	Options
F01	Unit conversion for temperature display	0 - Celsius 1 - Fahrenheit
F02	Maintenance reminder	0 - No maintenance reminder 1 - Maintenance reminder (default)
F03	Time for maintenance reminder	Select 30 - 365 days (default: 365)
F04	Reset maintenance time	Select 1 and confirm to reset day count of maintenance reminder
F05	Clear error code history	Select 1 and confirm to clear error code
F06	Electric heating elements	DO NOT ADJUST (default: 1)
F07	Legionella protection	0 - off (default) 1 - on (SCALD RISK, refer to chapter 4.2.6)
F08	Electric heating element auto activation temperature	DO NOT ADJUST (default: 5)
F09	Legionella protection cycle time (hour)	Select hour of day: 0-23 (default: 23)
F10	Not applicable to this product
F11	Set vacation mode temperature	Select 10-20°C (equals 50-68°F)
F12	Not applicable to this product
F13	Not applicable to this product
F14	Time until electric heating element activates when heat pump is not able to increase tank temperature	Select 1-150; Unit: 10 minutes (default: 84 equals 840 minutes/14 hours)
F15	Dry fire protection	DO NOT ADJUST (default: 1)
F16	Overcurrent protection	DO NOT ADJUST (default: 1)
F17	Legionella protection temperature	Select 60-70°C (equals 140-158°F)
F18	Maximum temperature setpoint	Select 65-70°C (equals 149 - 158°F)
F19	E-Heater mode expiration after 72 hours	0 - off 1 - on (default)
F20	Hybrid mode expiration after 72 hours	0 - off 1 - on (default)
F21	Modbus address	Not applicable (default: 1)
F22	Not applicable to this product
F23	Reset unit to factory settings	Select 1 and confirm to reset
F24	Not applicable to this product
F25	Not applicable to this product
F26	Legionella protection cycle time (minutes)	Select minutes of the hour: 0-59 (default: 0)
F27	Activation of electric heating element when heat pump is not able to increase tank temperature	0 - off 1 - on (default)
F28	Not applicable to this product
F29	Not applicable to this product
F30	Backlight behavior	0 - Backlight always on 1 - Backlight turns off after 3 seconds
F31	Not applicable to this product
F32	Not applicable to this product
F33	Not applicable to this product
F34	Mute sound	0 - sound is on (default) 1 - sound is off
F35	Automatic child lock	0 - off (default) 1 - on
F36	Not applicable to this product
F37	Not applicable to this product
F38	Auto shutoff valve leak protection	0 - off (default) 1 - on
F39	Manual activation of legionella protection	0 - off (default) 1 - on
F40	Duct settings	0 - no duct 1 or 2 select if duct is installed

Table 17 Advanced Settings

Table 18 Advanced Settings Continued

7 Maintenance

DANGER: Hazardous voltage! Disconnect all power before servicing.

WARNING: Modification, tampering! Tampering with internal components is dangerous and voids the warranty. Only qualified personnel should service the unit.

CAUTION: Personal injury, product damage! Do not use if any part has been under water. Call a qualified service technician.

Proper preventative maintenance is required to maintain the warranty and extend the life of the water heater.

Contact your installer, plumbing contractor, or service agency for service.

Required Maintenance	Frequency
Drain Water Heater	annually
Test T&P Valve	annually
Heating Elements	annually
Anode Rod	annually
Air Filter	3 months
Ducting (if installed)	annually

Table 19 Regular maintenance requirements

i Utilize F02 and F03 settings to remind the user of maintenance.

7.1 Drain Water Heater

WARNING: Scald hazard! Water drained from the tank may be hot. Direct it to a suitable drain.

NOTICE: Product damage! Ensure power is shut off before draining. Fill the tank completely with water before re-energizing.

Drain a few quarts of water after the first 6 months, then annually, to flush out sediment. Failure due to deposits is not covered by warranty.

Disconnect power from the water heater.
Attach a hose to the drain valve and connect it to a drain or bucket.
Close the cold water supply line shut-off valve.
Open the drain valve.
Flush until water runs clear.
Open a hot water faucet to let air escape.
Re-open the cold water supply line shut-off valve.
Close the hot water faucet once air has been bled from the system.
Make sure the water heater is completely filled before re-energizing.

7.2 Test the T&P Valve

WARNING: Scald hazard! Water drained may be hot.

Test the relief valve operation after filling and pressurizing the system, and at least annually.

Place a bucket under the discharge line of the T&P valve.
Lift the lever as shown in Figure 17.
Ensure water discharges freely.
Close the lever.
Check for leaks after closing the valve.

If the valve fails to operate correctly or leaks, replace it immediately.

7.3 Heating Elements

WARNING: Hazardous voltage! Removal and replacement of heating elements involve electrical disconnection and must be performed by a qualified service technician.

Heating elements can accumulate lime and mineral deposits, reducing effectiveness. Clean elements annually with white vinegar and a stiff bristle brush if they are coated with calcium.

i Ensure you have new gaskets available before servicing elements.

To check or replace an element:

DISCONNECT POWER at the breaker.
Drain the tank (see 7.1).
Use a 1 1/2" socket wrench to remove the heating element.
Service or replace the element.
Install a new gasket when tightening the element. Do not overtighten.
Open faucets to let air escape.
Fill the tank with water until water runs normally.
Check for leaks before turning on power.

7.4 Anode Rod

The anode rod is a sacrificial consumable item that prevents corrosion and premature tank failure. Inspect the anode rod after the first six months, then annually, or more frequently if you use a water softener.

Replace the anode rod if it is partially depleted or substantially worn out (See Figure 19).

Part Number	Material	Model
7738007478	Magnesium	TR7000T-50 \| TR7000T-65
7738007479	Magnesium	TR7000T-80

Table 20 Anode rod part numbers

NOTICE: Warranty exclusion! Damages or malfunction caused by lack of anode rod maintenance are not covered by the warranty.

To inspect or replace the anode rod:

Shut off the water heater.
Close the cold water line and drain a few gallons of water through a faucet to remove pressure.
Remove the head cover by unscrewing 6 Phillips head screws.
Locate and remove the white anode rod cap.
Use a 1 1/8" socket head with an 18-inch extension to unscrew the anode rod.
Check and/or replace the anode rod.
Fill the water heater by opening the cold water line again.
Check for leaks before mounting the head cover and powering the unit.

7.5 Air Filter

Clean the air filter every three months, or more frequently if installed in an area with poor air quality. The filter is located on the top of the water heater (if not ducted).

Push the handle to remove the filter, then rinse with water to clean it.

8 Troubleshooting

This section provides a table of common problems, their possible causes, and corrective actions.

Problem	Possible Cause	Corrective Action
Display is not powered	No power to the water heater	1. Check for tripped breaker, restore power. 2. Check voltage at terminal block (~208-240V).
	No power to the display	1. Check connection on main board to display. 2. Check if display connection has power. 3. If power from mainboard connection is available, replace display board.
	TCO tripped	1. Understand cause of TCO activation. 2. Reset TCO.
	Board failure	Replace failed board.
No power	1. Check for tripped breaker, restore power. 2. Check voltage at terminal block (~208-240V). 3. Check if display has power, if not see above.
No hot water	Vacation mode is active	1. Check operation mode on display for VACATION. 2. Change to desired mode.
	Error Code	1. Error code is displayed. 2. Check error code table and follow corrective actions.
	Water heater has not recovered	1. Check current temperature on display. 2. Change operation to mode with higher recovery rate, refer to section "Selecting Operation Mode".
Running out of hot water	Plumbing Issues	Check for plumbing issues (e.g., crossover, bad mixing valve, etc.).
	Wrong operation mode selected	Select mode with higher recovery rate.
	Setpoint temperature too low	Raise setpoint, refer to section "Water Temperature Setting".
	Demand response is active	Check if DR is activated, refer to section "Demand Response".
	Water heater is undersized	1. Stagger hot water usage. 2. Check with your installer.
Temperature too high	Setpoint temperature too high	Lower setpoint.
	Plumbing Issues	Check for plumbing issues (e.g., crossover, bad mixing valve, etc.).
Water pressure too low	Plumbing Issues	Check for plumbing issues (e.g., closed cold water supply valve).
Leak from drain valve	1. Verify drain valve is fully closed. 2. Replace if it still leaks.
Leak from water connections or condensate drain	1. Check for leaks. 2. Tighten connections. 3. Replace if necessary.
Water in drain pan	Leak from T&P valve	1. Check for leak at T&P valve. 2. Check if expansion tank is full. 3. Replace T&P valve and/or expansion tank.
	Leak from tank	Inspect tank for leakage, and replace whole unit if necessary.

Table 21 Troubleshooting

8.1 Error code table

Active error codes are displayed. Cleared error codes can be found in operating parameters (Chapter 6.5.1: 1Er, 2Er, 3Er).

Error Code Reference Number	History Number	Description	Result	Corrective Action
EC52	8	Temperature sensor T3 not detected	Water heater will operate by using electric heating elements only.	1. Check connector CN28 to main board. 2. Check resistance, refer to chart "Electric Resistance Specifications".
EC53	7	Temperature sensor T4 not detected	Water heater will operate by using electric heating elements only.	1. Check connector CN28 to main board. 2. Check resistance, refer to chart "Electric Resistance Specifications".
EC54	5	Temperature sensor TP not detected	Water heater will operate by using electric heating elements only.	1. Check connector CN28 to main board. 2. Check resistance, refer to chart "Electric Resistance Specifications".
EHOO	2	Heat pump failure	Water heater cannot operate.	Call technician.
EH03	3	Fan error	Water heater cannot operate.	1. Check if fan can move freely. 2. Inspect wire for damage. 3. Check connector CN12 to main board.
EHOb	1	Display communication failure to board	Water heater cannot operate.	1. Verify display connector CN53 on main board. 2. Re-energize unit.
EH5d	11	Heating elements open circuit	Water heater will operate by utilizing heat pump.	1. Verify wire connections. 2. Check for resistance for elements (12.8 Ohms at 240 V). 3. Replace heating element.
EH5H	6	Temperature sensor TH not detected	Water heater will operate by using electric heating elements only.	1. Check connector CN29 to main board. 2. Check resistance, refer to chart "Electric Resistance Specifications".
EH5L	9	Temperature sensor T5L not detected	Water heater will operate by using electric heating elements only.	1. Check connector CN24 to main board. 2. Check resistance, refer to chart "Electric Resistance Specifications".
EH5U	10	Temperature sensor T5U not detected	Water heater will operate by using electric heating elements only.	1. Check connector CN24 to main board. 2. Check resistance, refer to chart "Electric Resistance Specifications".
EHHP	12	Heat pump system fault (Activates when PH20, PH21, PC30, PC06 appears 3 times in a row or at least one error code lasts longer than 1 hour)	Water heater will operate by utilizing heat pump.	Call technician.
FC06	23	Auto shut-off valve not detected	Water heater can operate normally.	1. Check if auto shut-off valve is installed. 2. If not installed, make sure F38 is 0. 3. Replace faulty auto shut-off valve.
PC06	19	High temperature at TP (TP > 230°F/110°C)	Water heater will operate by using electric heating elements only.	Clears when TP < 194°F/90°C: if error repeats, call technician.
PC30	18	High refrigerant pressure detected > 435 PSI when compressor on / > 350 PSI when compressor off	Water heater will operate by using electric heating elements only.	Call technician.
PH15	4	Electric leakage detected	Water heater cannot operate.	1. Disconnect from power immediately. 2. Call service technician.
PH20	14	Compressor is not able to heat up refrigerant	Water heater will operate by using electric heating elements only.	1. Check if sensors are properly mounted. 2. Check temperature delta on the refrigerant line. 3. Call technician.
PH21	15	Compressor working current too large	Water heater will operate by using electric heating elements only.	1. Power off unit and wait 1 hour before re-energizing. 2. If error persists, call technician.
PH22	16	Leak sensor activated	Water heater can operate normally.	Check for leaks and fix leaking part.
PH24	17	T5L < 39°F/4°C and T4 < 45°F/9°C: Frost Protection active	Water heater will operate by using electric heating elements only.	Frost protection deactivates automatically. If inlet air is ducted, consider taking indoor air.
PH91	22	Evaporator temperature too low	Water heater will operate by using electric heating elements only.	1. Check temperature sensor T3 (connections and resistance).
PH9b	20	Water temperature exceeds set point by 9°F (5°C)	Water heater will operate by using electric heating elements only.	1. Check resistance of temperature sensor T5U. 2. Replace if out of specification.
PHdH	13	Dry burning protection is running	Water heater cannot operate.	Make sure water is in the tank by opening hot water faucet.
PHL1	21	Water detected in condensate tray	Water heater will operate by using electric heating elements only.	Check if condensate drain is blocked.

Table 22 Error code table

8.2 Thermal Cutout

The water heater has a thermal cutout (TCO) that breaks power to the water heater if the temperature becomes excessively high. The TCO must be reset manually.

WARNING: Personal injury, product damage, property damage, improper operation! Investigate the cause of high temperature before resetting the TCO.

To reset the TCO:

Disconnect all power to the unit.
Remove the upper heating element cover and insulation.
Press the reset button.
Replace insulation and cover before turning on power.

8.3 Electric Resistance Specifications

The water heater uses temperature sensors and heating elements based on resistance values. Refer to the table for correct resistances. Significant variations from specified values may indicate a component replacement is needed. Contact a qualified technician.

Part	Resistance Specifications (±5%)
Electric Heating Element	12.8 Ohm
T3	10 kOhm (at 25°C)
T4	10 kOhm (at 25°C)
TP	5 kOhm (at 90°C)
TH	10 kOhm (at 10°C)
T5L	17.6 kOhm (at 50°C)
T5U	17.6 kOhm (at 50°C)

Table 23 Electrical resistance specifications

8.3 Electrical Diagram

This guide recommends minimum branch circuit sizing and wire size based on National Electric Codes.

Table 24 Electrical Specifications

Water Heater Wattage at 240V	Phases	Recommended Over Current Protection (Fuse or Circuit Breaker) Amperage Rating 208-240V	Copper Wire Size AWG Based on N.E.C. Table 310-16 (75°C) 208-240V
5,500	1	30	10

9 Water Heater Components

Figure 24 illustrates the various components of the water heater:

Filter
Top Cover
Air Inlet
Display
Air Outlet
Junction Box
Upper Cover
Junction Box Cover
Compressor
Electronic Control Box
Evaporator
Cover
Fan Assembly
Anode Rod
Condensate Outlet
TCO
T&P Valve
Cover
Hot Water Outlet
Upper Electric Heating Element
Lower Electric Heating Element
Drain Valve
Cold Water Inlet
Insulating Cover

10 Installation Checklist

Use this checklist to ensure proper installation.

Category	Item	Check
Installation Location	Is the product installation location inside and the temperature remains between 37°F and 109°F?	Check
	Is installation in an enclosed space larger than 700 cubic feet? Or installed in an enclosed space with louvered doors? Or will the supply and return both be ducted?	Check
	Is the product installed close to the major hot water usage?	Check
	Is the product placed in a drain pan?	Check
	Does the product have a top clearance of 25.5" ((50 & 65 Gallon)/32" (80 Gallon) for service?	Check
	Does the product have a side clearance to the air exhaust of 6"?	Check
Plumbing	Is a backflow preventer installed in the water supply line? (When required by local building codes)	Check
	Is an expansion vessel installed between the cold water inlet and the backflow preventer or any other one-way device?	Check
	Is the discharge line for the pressure relief valve (PRV) installed correctly?	Check
	Is the water heater filled with water and air purged out?	Check
	Are all water connections secure and free of leak?	Check
	Is the condensate drain pipe installed with proper drainage?	Check
Electrical	Does the breaker meet the requirements of 208V/230V, 60Hz, 30A double pole breaker?	Check
	Is minimum of 10 AWG copper wire used? (For lines <100ft)	Check
	Are all wiring connections secure and properly grounded?	Check
Optional: Ducting	Duct adapter kit installed according to instructions?	Check
	Is HVAC approved ducting installed?	Check
	Is the maximum duct length within the parameters stated in this manual?	Check
	Is the ducting installed with proper ventilation clearances from other vents including fresh air intakes, exhaust, dryer vents, and such as to not impede or obstruct operation of any appliances?	Check
Operation	Unit is filled and checked for leaks prior to powering on.	Check
	Is the unit turned on?	Check
	Is the temperature and mode setting appropriate? A thermostatic mixing valve is required for installations where the demand response function will be enabled.	Check
	Has the owner received the manual and knows how to operate the display?	Check
	Has the owner received the warranty document and is aware of the maintenance required to ensure warranty?	Check

Table 25 Installation Checklist

Online Help Resources

Visit www.bosch-homecomfort.com/service for FAQs, videos, and service bulletins. You can also scan the QR code provided.

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