User Manual

1 Safety Information

1.1 Safety Definitions

This manual contains safety information and instructions to help eliminate or reduce the risk of accidents and injuries.

• ? DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
• ⚠️ WARNING: Indicates a hazardous situation that, if not avoided, could result in death or serious injury.
• ? CAUTION: Indicates a hazardous situation which, if not avoided, could result in property damage and minor or moderate injury.
• ℹ️ NOTICE: This symbol indicates important information where there is no risk to people or property.

Additional Symbols

General Safety Instructions

1. READ ALL INSTRUCTIONS BEFORE USING THIS WATER HEATER.
2. This water heater must be grounded. Connect only to a properly grounded outlet. Refer to "GROUNDING INSTRUCTIONS".
3. Install or locate this water heater only in accordance with the provided installation instructions.
4. Use this water heater only for its intended use as described in this manual.
5. Do not use an extension cord set with this water heater. If no receptacle is available, contact a qualified electrician.
6. Close supervision is necessary when used by children.
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 nearest authorized service facility for examination, repair, or adjustment.
9. Do not use multi-outlet adaptors (i.e., power strips) with this water heater.
10. Failure to inspect the anode rod at least once a year could cause the tank to fail and leak. This condition is not covered under the manufacturer's warranty.
11. Install the water heater so that if it leaks, the water flow will not cause damage. National Plumbing codes require a drain pan. Failure to install one is the sole responsibility of the owner/installer. Reference UPC 2006 Section 508.1 or IPC 2006 Section 504.7.

1.2 Important Safety Instructions

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

2 Information about the product

2.1 Models overview

Description of Fig. 2 (Models Overview): A diagram showing the top and side views of the electric mini-tank water heater. Numbered labels indicate key components:

• 1. Temperature & pressure relief valve, ¼ NPT male
• 2. Cold water inlet (BLUE) ½ NPT male (ES025 and ES040) / ¾ NPT male (ES080 equipped with converter)
• 3. Temperature Adjustment Knob
• 4. Temperature & pressure relief valve discharge line to drain
• 5. ¾ NPT female tapping for relief valve
• 6. Hot water outlet (RED) ½ NPT male (ES025 and ES040) / ¾ NPT male (ES080 equipped with converter)

2.2 Dimensions

Description of Fig. 3 & 4 (Dimensions): Diagrams illustrating the front, side, and top views of the water heater, with dimensions labeled A through F. The table below provides specific dimensions for different capacities.

* Vertically installation only

2.3 Technical data

3 Installation instructions

3.1 Mounting the heater

Wall mounting

ℹ️ NOTICE: Material damages! Use screws that are suitable for the wall material and the weight of the heater.

After determining the installation position, drill two holes spaced 2.44 inches apart horizontally, with a diameter of 0.394 inches and a depth of at least 2.76 inches. Insert two plastic expansion tubes into the holes and fix the water heater bracket with fastening screws.

Description of diagram: Shows drilling of holes on a wall, with measurements 2.44" and Φ0.394". Text indicates "Install the wall hole".

Unclench the plastic shell at the back of the water heater. Align the two hanging holes on the back of the heater with the two hooks on the water heater bracket and pull down to hang securely.

Description of diagram: Illustrates the water heater being hung on a bracket attached to the wall. Labels include: Water Heater, Hanging Bracket (on the water heater), Plastic Shell, Water Heater Bracket, Plastic Expansion Tube, Fastening Screw, Wall.

? CAUTION: The appliance must be hung securely to prevent personal injury and property damage from falling.

Floor mounting

The heater can sit on the floor. When placed on the floor, additional reinforcement is required.

3.2 Pipe connections

• Connect the cold water inlet pipe to the inlet tapping (marked with a blue ring).
• Ensure an isolation valve is installed on the cold water supply to the water heater.
• Connect the hot water outlet pipe to the outlet tapping (marked with a red ring).

? CAUTION: To reduce the risk of excessive pressures and temperatures in this water heater:

• Install the supplied temperature and pressure protective equipment required by local codes, but not less than a combination temperature and pressure relief valve certified by a nationally recognized testing laboratory, meeting requirements for Relief Valves and Automatic Gas Shut-off Devices for Hot Water Supply Systems, ANSI Z21.22.

The supplied temperature and pressure relief valve is marked with a maximum set pressure (150 psi) that does not exceed the marked maximum working pressure of the water heater.

• Install the valve in the opening provided and marked for this purpose in the water heater.
• Orient it or provide tubing so that any discharge from the valve exits within 6 inches above, or at any distance below, the structural floor, and cannot contact any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstances.

3.3 Closed system thermal expansion

Periodic discharge of the temperature and pressure relief valve or failure of the element gasket may occur due to thermal expansion in a closed water supply system. A water utility supply meter may contain a check valve, backflow preventer, or water pressure reducing valve, creating a closed system.

During the heating cycle, water expands, increasing pressure inside the water heater. This can cause the temperature and pressure relief valve to discharge hot water, leading to energy loss and lime build-up on the valve seat.

To prevent this:

• Install a diaphragm-type expansion tank suitable for potable water on the cold water supply line. A minimum 0.5-gallon expansion tank should be used.

Contact the local water supplier or plumbing inspector for information on how to control this situation. Do not plug the temperature and pressure relief valve.

ℹ️ NOTICE: Wrap Teflon tape around the threaded opening of the pressure relief valve at least 15 times (approx. 1.2 meters) to prevent water leakage.

Description of diagram: Shows Teflon tape being wrapped around a threaded fitting, with text "Wrap at least 15 times".

ℹ️ NOTICE: Wrap at least 8 turns (approx. 25.2 inches / 65 cm) of Teflon tape around the threaded opening of the hose connector.

Description of diagram: Shows a hose connector with a flow guide tube and Teflon tape being wrapped around the threaded opening, with text "Wrap at least 8 turns".

National Plumbing codes may require a drain pan for water heater installation. Failure to install one is the sole responsibility of owner/installer. Reference UPC or IPC.

4 Use

4.1 Starting and testing

? CAUTION: DO NOT supply power to water heater until filled with water.

To fill the heater:

• Open supply valve for water heater to fill with water.
• Open hot water tap(s) supplied by the water heater to purge air out of the system. Once air is purged, close hot water tap.
• Visually check for any leaks.

Turning heater on

For models not fitted with a switch:

• Supply power to the water heater by plugging in the power cord.
• If the light does not come on, turn the control knob in a clockwise direction.

The light will come on until water temperature has reached the thermostat temperature setting. The light will come back on any time the water temperature inside the tank drops below the thermostat setting.

Description of Fig. 5 (Temperature Setting): Diagram showing the front of the heater with labels S, C, M. S likely refers to the cover, C to the thermostat adjustment knob, and M to a control knob or indicator light.

? DANGER: If user's water pressure is high, the TP valve may relieve pressure during the heating process. Water temperature will be over 145 °F after pressure relief, which can cause severe burns instantly or death from scalds. Please take attention!

4.2 Temperature setting

The temperature of the hot water is adjusted by rotating the knob M (Fig. 5) located on the front cover. Temperature range is 55-145 °F.

• Turn the knob clockwise to increase temperature.
• Turn the knob counter-clockwise to decrease temperature.

5 Maintenance

? CAUTION: Do not attempt to repair this water heater yourself. Call a service person for assistance. Always turn off the power supply to the heater prior to servicing or draining the heater.

ℹ️ NOTICE: For most maintenance operations, the water will have to be drained from the heater. For all these operations, the power cord should be disconnected and the front cover removed.

5.1 Removing the cover

Remove the rubber seal covering the Phillips screw (Fig. 5 [S]), and unscrew the Phillips screw. The cover (Fig. 5 [C]) can now be removed by slightly rotating. When reassembling, work in the opposite way, being careful to insert the tongue of the cover into the slot.

5.2 Draining the heater

If the heater has been installed with flexible hoses:

• Shut off the power supply.
• Turn the heater upside down over a sink to drain the water out of it.

5.3 Inspecting the anode rod

The purpose of the anode rod (Fig. 8, [N]) is to protect the tank against corrosion. It is critical that the anode rod be inspected once a year to determine whether it requires replacement. To access the anode rod, the heating element must be removed (see Section 5.4).

Upon inspection, the anode rod surface should appear smooth. If the rod surface appears pitted, bumpy, rusty, or if the rod is missing completely, then it must be replaced.

To access the anode rod:

• Remove the heating element (see Section 5.4).

Original anode rod sizes

• Length 4.72" Diameter 0.787"

Certain installations may require more frequent replacement of the anode rod:

• Recirculation applications
• Poor water quality
• Galvanic/electrolytic corrosion
• High flow applications

In the event of poor water quality, consult a local water treatment professional for water treatment options. Always ensure the water heater is grounded. Damage resulting from poor water quality or failure to replace the anode rod is not covered under the manufacturer's warranty. For additional questions, please call Technical Service.

5.4 Removing the heating element

Description of Fig. 6: Diagram showing internal components. Labels A-L refer to parts like Heating Element Pressing Plate (A), Heating Element (B), wires (C, D, E), thermostat capillary (G), power cord (L).

• Take out the power cord L from the plastic part (Fig. 6).
• Use a cross screwdriver to unscrew the 3-in-1 cross screw J on the heating element terminals of red wire J and blue wire C (Fig. 6).
• Remove the wire nail I and press the thermostat capillary G and the thermal cut-out capillary H, and take it out of the blind tube opening (Fig. 6).
• Loosen the 5 nuts and spring washer on the heating element pressing plate A with the sleeve, and take out the heating element pressing plate A (Fig. 6).
• Remove heating element B (Fig. 6).

5.5 Descaling the heating element

Scale deposits can affect the heating capability of the element and may even cause damage. The element can be descaled either chemically or manually.

• Soak the element in white vinegar or other descaling solution.
• Once descaled, rinse well with fresh water, to which you should add some baking soda.
• -or-
• Once the element has dried, use a soft brush (non-metallic to prevent damaging the stainless steel sheath) on the element.
• Brush the dried mineral off.
• Reinstall the element with gasket and make the wire connections.

Description of Fig. 7: Diagram showing the heating element.

Description of Fig. 8: Diagram showing the anode rod, labeled [N].

ℹ️ NOTICE: Make sure the tank has been refilled with water before restoring power.

6 Replacement of parts

6.1 Changing the anode rod

• Turn off the power supply and drain the heater (see Draining the Heater).
• Remove heating element (see previous section).
• Unscrew anode rod from threaded connection.
• Remove and replace the anode rod (Fig. 8, [N]).
• Reinstall heating element.
• Refill tank with water before restoring power.

6.2 Changing the heating element

• Turn off power supply and drain the heater (see Draining the Heater).
• Remove the heating element (see section on Removing the Heating Element).
• Install new element with gasket, making sure the gasket and element are positioned correctly.
• Tighten the retaining nuts and make the wire connections.
• Ensure that the thermostat temperature sensor is inserted into the well located on the element assembly and secured with black rubber grommet.
• Refill tank with water before restoring power.

6.3 Changing the thermostat

• Turn off power supply.
• Disconnect the 2 wire connectors on thermostat.
• Loosen the two brass screws at the right side of the thermostat and pull wires out.
• Remove thermostat temperature sensor from well located in element assembly.
• Unscrew and remove the two Phillips screws holding the thermostat onto the tank.
• Install new thermostat and re-attach wiring and screws.
• Ensure that the thermostat temperature sensor is inserted into the well located on the element assembly and secured with black rubber grommet.

7 Troubleshooting

7.1 Fault Assessment and Troubleshooting

7.2 Resetting High Limit Switch

Occasionally, the high temperature limit shut off device may trip the reset. This occurs when water temperature exceeds 190 °F. The shut off device may also trigger from a power outage or electrical storm.

To reach the thermostat:

• Disconnect power cord and remove installation cover.
• Firmly press reset button (Fig. 9, [B]) with the tip of a ball point pen or similar object.

Description of Fig. 9: Diagram showing the high limit switch with a reset button labeled [B].

A click indicates the reset was tripped.

• Reconnect power.

IMPORTANT:

• Check the operation of the thermostat: Turn temperature dial from high to low.
• If the red light does not go off on low setting: Turn off power supply and call a service person to replace the thermostat.
• If the red light does go off, the thermostat is working well: Place dial setting to desired setting.

ℹ️ NOTICE: A lower setting is more economical and reduces the risk of scalding.

Replace cover plate.

? CAUTION: Call a technician if the high limit needs to be reset frequently.

8 Interior components diagram

Description of Fig. 10 (Interior Components Diagram): An exploded view diagram showing the internal components of the water heater. The table below lists each part by number.