Rheem Electric Point of Use Water Heaters

Introduction

This manual serves a dual purpose: to provide installers with essential directions and recommendations for the proper installation and adjustment of the water heater, and to guide owner-operators on the features, operation, safety precautions, maintenance, and troubleshooting of the water heater. It includes a parts list.

It is imperative that all individuals involved in installing, operating, or adjusting this water heater read these instructions carefully to understand the procedures. Please keep this manual in a safe place for future reference.

Important Safety Information

⚠️ Recognize this symbol as an indication of Important Safety Information!

California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

IMPORTANT SAFETY INSTRUCTIONS

WARNING—When using electrical appliances, basic safety precautions to reduce the risk of fire, electric shock, or injury to persons should be followed, including:

1. READ ALL INSTRUCTIONS BEFORE USING THIS WATER HEATER.
2. The cord and plug connected water heater (2½ gallon models) must be grounded. Connect only to a properly grounded outlet. See "Electrical Connections" section on page 8.
3. Install or locate this water heater in accordance with the provided installation instructions.
4. Use this water heater only for its intended use as described in this manual.
5. As with any appliance, close supervision is necessary when used by children.
6. Do Not use an extension cord set with this water heater. If no receptacle is available adjacent to the water heater, contact a qualified electrician to have one properly installed.
7. Do Not operate this water heater if it has a damaged cord or plug, if it is not working properly, or if it has been damaged or dropped.
8. This water heater should be serviced only by qualified service personnel. Contact the nearest authorized service center for examination, repair or adjustment.

SAVE THESE INSTRUCTIONS

[UL Listed]

Manufactured under trademark license by: Rheem Manufacturing Company, 2600 Gunter Park Drive East, Montgomery, AL 36124-4020

Part No. AP12169-5 (01/05) Pub. No. 49-50013-4 11-03 JR

Installation Instructions

Local Installation Regulations

This water heater must be installed in accordance with these instructions, local codes, utility codes, utility company requirements or, in the absence of local codes, the latest edition of the National Electrical Code. The National Electrical Code is available from some local libraries or can be purchased from the National Fire Protection Association, Batterymarch Park, Quincy, MA 02269 as booklet ANSI/NFPA 70.

Location

This water heater is designed to meet a wide range of applications, fulfilling a demand for a small water heater that can be installed in limited spaces like under countertops, in cabinets, or in closets.

• Locate the water heater in a clean, dry area as near as practical to hot water fixtures or the most frequently used water faucet.
• Position the water heater in a clean, dry area close to the area of greatest heated water demand. Long uninsulated hot water lines can waste energy and water.
• Ensure the water heater is placed so that the thermostat and element access panels can be removed for inspection and servicing (e.g., element removal, control checking).
• Protect the water heater and water lines from freezing temperatures. Do not install in outdoor, unprotected areas.

Diagram Description (Page 5): Illustrates clearance requirements. 'A' indicates the diameter of the water heater plus a minimum of 2 inches. 'B' indicates a maximum of 2 inches.

CAUTION: The water heater should not be located where leakage from the tank or connections could damage adjacent areas or lower floors. If such locations are unavoidable, install a suitable, adequately drained catch pan beneath the water heater.

NOTICE: Auxiliary catch pans must conform to local codes. Catch Pan Kits are available from the water heater's point of purchase or any water heater distributor.

NOTICE: To open the drain, the line should be at least 3/4" ID and pitched for proper drainage.

Inspect Shipment

Inspect the water heater for possible damage. Verify the markings on the rating plate to ensure the power supply corresponds to the water heater's requirements.

Thermal Expansion

Determine if a check valve exists in the inlet water line (this could be a backflow preventer, pressure reducing valve, water meter, or water softener). A check valve in the cold water inlet line creates a "closed water system." An "open" system lacks such a device.

When water is heated, it expands, increasing pressure. In an "open" system, this expansion dissipates into the city main. However, a "closed water system" prevents this, leading to a rapid and potentially dangerous pressure increase. This can cause the relief valve to operate frequently, leading to premature failure of the valve or heater. Replacing the relief valve will not solve the underlying issue.

The recommended method to control thermal expansion is to install an expansion tank in the cold water line between the water heater and the check valve. This tank has an air cushion to absorb pressure increases. Other methods may be available; consult your installer, water supplier, or plumbing inspector.

Water Supply Connections

Refer to the "Typical Installation" illustrations for suggested connections. Unions or flexible copper connectors are recommended for easy disconnection during servicing.

• Connect the cold water supply line to the 3/4" pipe connection near the bottom of the water heater (for 6 and 20 gallon models).
• Install a shut-off valve and a drain valve (supplied with 2½ gallon models only) in the cold water line near the heater.
• Connect the hot water line to the 3/4" pipe connection marked "HOT" on the side near the top of the heater.
• For 2½ gallon models, the hot and cold water connections are 1/2" pipe connections located on top of the heater.
• Local codes may require an anti-siphon device on the water inlet for side-connected water heaters.

NOTICE: Do not apply heat directly to the HOT or COLD water connections. If sweat connections are used, sweat the tubing to the adapter before attaching the adapter to the heater connections. Applying heat to the water supply fittings will permanently damage the dip tube and/or heat traps.

Typical Installation Diagram Description (Page 7)

The diagram shows two typical installation layouts. Key components illustrated include:

• Plumbing: Hot water outlet to fixtures, cold water supply, shut-off valves, drain valve, relief valve, temperature & pressure relief valve, unions, anode, recommended heat trap (6" minimum), auxiliary catch pan, and suitable open drain.
• Electrical: Opening for 1/2" or 3/4" electrical fitting (for 6-20 gallon models), power supply cord (for 2½ gallon models only).
• Access: Jacket access panel.
• Clearances: 6" air gap shown.

A separate diagram illustrates the installation of a Vacuum Relief Valve (not supplied), noting it should be installed per local codes and manufacturer's instructions.

A new combination temperature and pressure relief valve, complying with ANSI Z21.22, is supplied and must remain installed. No valve should be installed between the relief valve and the tank. Local codes govern relief valve installation.

WARNING: The relief valve's pressure rating must not exceed 150 PSI, the maximum working pressure marked on the water heater's rating plate.

Relief Valve

The relief valve's Btuh rating must not be less than the water heater's input rating (1 watt = 3.412 Btuh). Connect the relief valve outlet to a suitable open drain, ensuring the discharge water cannot contact live electrical parts or persons, and to prevent water damage.

Discharge piping must be approved for hot water distribution, be no smaller than the valve outlet, and pitch downward for gravity drainage. The discharge line end should not be threaded or concealed, and must be protected from freezing. No valves, restrictions, or reducer couplings are permitted in the discharge line.

To Fill the Water Heater

1. Ensure the drain valve is completely closed.
2. Open the shut-off valve in the cold water supply line.
3. Slowly open each hot water faucet to allow air to vent from the heater and piping.

A steady flow of water from the hot water faucet(s) indicates the water heater is full.

Condensation

Condensation may form on the tank when it is first filled or during heavy water draw with very cold inlet water. This is usually temporary and disappears as the water heats. If condensation persists, check piping and fittings for leaks.

Additional information may be found at www.rheem.com under "Library," specifically Technical Service Bulletins 1300 Series, Bulletin #1303.

Electrical Connections

All wiring must comply with local codes or the latest edition of the National Electrical Code (ANSI/NFPA 70). Voltage and wattage requirements are on the rating plate.

• 2½ Gallon Models: Supplied with a 120 VAC plug-connected power supply cord. Connect to a properly grounded receptacle on a branch circuit with copper conductors, overcurrent protection, and a suitable disconnect means. Field wiring can be done by removing the access cover, disconnecting the cord, and using 1/2" or 3/4" electrical fittings in the junction bracket.
• 6 through 20 Gallon Models: Wired to a junction bracket inside the jacket. An opening for 1/2" or 3/4" electrical fittings is provided for field wiring. A separate branch circuit with copper conductors, overcurrent protection, and a suitable disconnect means must be provided by a qualified electrician.

Branch circuit wiring should include:

1. Metallic conduit or metallic sheathed cable approved as a grounding conductor, installed with approved fittings.
2. Non-metallic sheathed cable, metallic conduit, or metallic sheathed cable not approved as a ground conductor must include a separate grounding conductor attached to the ground terminals of the water heater and electrical distribution box.

CAUTION: The presence of water in piping and the water heater does not provide sufficient conduction for a ground. Non-metallic piping, dielectric unions, or flexible connectors can electrically isolate the water heater.

Branch Circuit Sizing and Wire Size Guide (Page 9)

This table provides recommended minimum branch circuit sizing and wire sizes based on the National Electric Code. Always refer to wiring diagrams for field connections.

*Less than 1500 watts may be wired 14 gauge with 15 amp protection. Check Local Electrical Codes, as they will also apply.

Insulation Blankets

External insulation blankets for electric water heaters are generally not necessary. This water heater meets or exceeds the National Appliance Energy Conservation Act standards for insulation and standby loss. The manufacturer's warranty does not cover damage or defects caused by the installation or use of unauthorized energy-saving devices, which may also endanger life and property.

CAUTION: If local codes require an external insulation blanket, ensure it does not obstruct the temperature and pressure relief valve, jacket access panels, electrical junction box, or operating/warning labels.

Pipe Insulation Installation (Page 10)

Diagram Description: Illustrates typical vertical, horizontal, and side piping arrangements for hot and cold pipe insulation. For increased energy efficiency, some models include two 24" sections of pipe insulation. Install according to illustrations that best meet requirements.

Relief Valve Insulation Installation (Page 10)

Diagram Description: Shows typical top and side connection arrangements for relief valve insulation. For increased energy efficiency, some models include a 2-3/8" section of pipe insulation. Slip the insulation cover over the T&P Valve and align the opening.

CAUTION: Ensure the T&P Valve opening is not obstructed by insulation.

Heat Traps

For increased energy efficiency, some water heaters are supplied with factory-installed heat traps in the hot outlet and cold water inlet lines.

NOTICE: Do not apply heat to the HOT or COLD water connections. If sweat connections are used, sweat tubing to adapter before fitting adapter to the water connections on heater. Any heat applied to the water supply fittings will permanently damage the dip tube and/or heat traps.

Installation Checklist (Page 11)

Verify the following items:

A. Water Heater Location

• Close to area of heated water demand.
• Indoors and protected from freezing temperatures.
• Area free of flammable vapors.
• Sufficient fresh air supply for proper operation.
• Provisions made to protect area from water damage.
• Sufficient room to service heater.

B. Water Supply

• Water heater completely filled with water.
• Air purged from water heater and piping.
• Water connections tight and free of leaks.

C. Relief Valve

• Temperature and Pressure Relief Valve properly installed and discharge line run to open drain.
• Discharge line protected from freezing.

D. Wiring

• Power supply voltage agrees with water heater rating plate.
• Branch circuit wire and fusing or circuit breaker of proper size.
• Electrical connections tight and unit properly grounded.

Operating Instructions

CAUTION: Hydrogen gas can be produced in a hot water system that has been idle for two weeks or more. HYDROGEN GAS IS EXTREMELY FLAMMABLE!! To dissipate gas and reduce injury risk, open a hot water faucet for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen is present, an unusual sound like escaping air may be heard. Do not smoke or use open flames near the faucet when it is open.

Safety Precautions

• ⚠️ Do turn off power to water heater if it has been subjected to overheating, fire, flood, or physical damage.
• ⚠️ Do Not turn on water heater unless it is filled with water.
• ⚠️ Do Not turn on water heater if the cold water supply shut-off valve is closed.

If you have difficulty understanding or following these instructions, it is recommended that a qualified person or serviceman perform the work.

Safety Controls

The water heater has a combination thermostat and temperature limiting control (ECO). If the water temperature becomes excessively high, the ECO breaks the power circuit to the heating element. This control must be reset manually.

To reset the temperature limiting control:

1. Turn off the power to the water heater.
2. Remove the jacket access panel(s) and insulation. (Do not remove the thermostat protective cover.)
3. Press the red RESET button.
4. Replace insulation and jacket access panel(s) before turning power back on.

CAUTION: The cause of a high temperature condition must be investigated by a qualified service technician before placing the water heater back in service.

Emergency Instructions

WARNING: If the water heater has been subjected to flood, fire, or physical damage, turn off power and water to the water heater. Do not operate again until thoroughly checked by qualified service personnel.

Water Temperature Setting

DANGER: Hotter water increases the potential for Hot Water SCALDS. Households with small children, disabled, or elderly persons may require a 120°F or lower thermostat setting to prevent contact with HOT water.

The water temperature is regulated by the adjustable surface-mounted thermostat(s) behind the jacket access panel(s). Dual element heaters have two thermostats.

Safety and energy conservation are key factors in selecting the thermostat setting. A lower setting saves energy and operating costs. For safety compliance, thermostats are factory set at 120°F or less where local codes require; this is the recommended starting point.

Water temperatures above 125°F can cause severe burns or death from scalding. Refer to the warnings on the label near the thermostat.

Mixing valves are available to reduce point-of-use water temperature by mixing hot and cold water. Contact a licensed plumber or local plumbing authority for details.

The following chart guides proper water temperature selection:

Table courtesy of Shriners Burn Institute

Diagram Description (Page 13): Shows the thermostat adjustment dial with a reset button, dial pointer, and protective cover. It indicates temperature settings like 125°F (52°C) and notes "TURN OFF POWER BEFORE SERVICING".

If adjustment is necessary:

1. Turn off the power to the water heater.
2. Remove jacket access panel(s) and insulation to expose the thermostat(s). (Do not remove the thermostat protective cover.)
3. Using a small screwdriver, set the thermostat(s) dial pointer(s) to the desired temperature.
4. Replace insulation and jacket access panel(s). Turn on the power to the water heater.

Care and Cleaning

Draining the Water Heater

CAUTION: Shut off power to the water heater before draining.

DANGER: Before manually operating the relief valve, ensure no one is exposed to the hot water released. Drained water can be hot enough to cause scalds. Direct water to a suitable drain to prevent injury or damage.

To drain, turn off the cold water supply. Open a hot water faucet or lift the relief valve handle to admit air. Attach a garden hose to the drain valve and direct it to a drain. Open the drain valve.

NOTICE: Refer to the Hydrogen Gas Caution in the Operating Instructions.

Vacation and Extended Shut-Down

If the water heater will be idle for an extended period, turn off power and water to conserve energy and prevent dangerous hydrogen gas buildup. Drain the heater and piping if freezing temperatures are possible.

After a long shut-down, have operation and controls checked by qualified service personnel. Ensure the water heater is completely filled before resuming operation.

Routine Preventative Maintenance

Proper maintenance ensures years of dependable service. Establish a routine maintenance program.

• Periodic inspection of operating controls, heating element, and wiring by qualified service personnel is recommended.
• If hissing or singing sounds increase excessively, the heating element may need cleaning. Contact a qualified installer or plumbing contractor.
• At least annually, lift and release the relief valve lever to ensure it operates freely. Allow several gallons to flush through the discharge line to an open drain.
• The tank can accumulate solids. Drain a few quarts monthly to clean deposits.
• Rapid faucet closing can cause water hammer. Install risers or arresting devices if needed.
• Remove the anode rod annually for inspection and replace if more than 6" of core wire is exposed. Ensure cold water supply is off before removal.

NOTICE: Do not remove the anode rod except for inspection/replacement, as it will shorten the life of the glass-lined tank and void warranty coverage.

Troubleshooting Tips

Before You Call For Service

Save time and money! Review this chart first.

CAUTION: For your safety, DO NOT attempt repair of electrical wiring, thermostats, heating elements, or other safety devices. Refer repairs to qualified service personnel.

Replacement Parts

For 2½ gallon models and 6, 10 & 20 gallon models with single elements.

Instructions For Placing a Parts Order

To place orders using a Visa/MasterCard, call 800-431-1549.

All parts orders should include:

1. The model and serial number of the water heater from the rating plate.
2. Specify voltage and wattage as marked on the rating plate.
3. Part description (as noted below) and number of parts desired.

CAUTION: For your safety, DO NOT attempt repair of electrical wiring, thermostat(s), heating elements, or other operating controls. Refer repairs to qualified service personnel.

2½ Gallon Models Diagram Description (Page 16)

Illustrates components including: Cavity insulation, Thermostat protective cover, Thermostat, Thermostat bracket, Heating element gasket, Heating element, Relief valve, Jacket access panel, Electrical cord set (120 VAC models only), Drain valve shroud, Drain valve, Snap bushing.

6, 10 and 20 Gallon Models Diagram Description (Page 16)

Illustrates components including: Anode rod, Shroud, Thermostat, Thermostat protective cover, Cavity insulation, Relief valve, Nipple, hot outlet, Shroud, Nipple, cold inlet, Thermostat bracket, Heating element, Heating element gasket, Jacket access panel.

Wiring Diagrams

Wiring Diagrams for Type-59T Therm-o-disc Thermostats (Page 17)

Two diagrams are provided:

• 120 V Plug Connected cord set ONLY: Shows wiring from the power cord to the junction box, thermostat & high temp. limit, and heating element. Connects to a properly grounded receptacle on the branch circuit.
• 120 V Field Connected ONLY: Shows wiring from the branch circuit to the junction box, thermostat & high temp. limit (ECO), and heating element. Connects to the electrical distribution panel.

Consumer Product Ownership Registration (Pages 19-20)

Follow these three steps to protect your new appliance investment:

1. Complete and mail the Consumer Product Ownership Registration today.
2. After mailing, store the document in a safe place for service information.
3. Read your Owner's Manual carefully for proper operation.

For Your Records: Write the Model Number and Serial Number (found on the appliance label). Staple sales slip or cancelled check as proof of purchase for warranty service.

If you require service, call 800-431-1549.

Consumer Product Ownership Registration Form Fields:

• Water Heater
• Model Number
• Serial Number
• Mr./Ms./Mrs./Miss.
• First Name
• Last Name
• Street Address
• Apt. #
• City
• State
• Zip Code
• Date Placed In Use (Month, Day, Year)
• Phone Number

NOTICE: Failure to complete and return this card does not diminish your limited warranty rights.