Eemax A865b25F Electric Mini-Tank Water Heaters Owner’s Manual

: June 5, 2024
: Eemax

Table of Contents

Eemax A865b25F Electric Mini-Tank Water Heaters
IMPORTANT SAFETY INSTRUCTIONS
TECHNICAL DATA
GENERAL INFORMATION
INSTALLATION INSTRUCTIONS
PLUMBING CONNECTIONS
TEMPERATURE AND PRESSURE RELIEF VALVE
FILLING THE WATER HEATER
ELECTRICAL CONNECTIONS
INSTRUCTIONS FOR USE
MAINTENANCE INSTRUCTIONS
TROUBLESHOOTING
SPARE PARTS/ ELECTRICAL DIAGRAM
ABOUT YOUR ELECTRIC MINI-TANK WATER HEATER
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Eemax A865b25F Electric Mini-Tank Water Heaters

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:

READ ALL INSTRUCTIONS BEFORE USING THIS WATER HEATER.
This water heater must be grounded. Connect only to properly grounded outlet. See “GROUNDING INSTRUCTIONS” found on page 6 and 11 (ELECTRICAL CONNECTIONS and ELECTRICAL DIAGRAM).
Install or locate this water heater only in accordance with the provided installation instructions.
Use this water heater only for its intended use as described in this manual.
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.
As with any appliance, close supervision is necessary when used by children.
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.
This water heater should be serviced only by qualified service personnel. Contact nearest authorized service facility for examination, repair, or adjustment.
The manufacturer and/or distributor is not responsible for damages caused by improper installation, or by non-observance of the instructions in this manual. A qualified, licensed technician must always install the mini tank water heater and conduct all subsequent service work and/or maintenance.
IMPORTANT: Never turn the water heater power on until the tank is completely full and water is flowing out of the hot water faucet.

TECHNICAL DATA

Capacity (gal)	1.5	2.5	4.0	6.0
Rated power at 120 Vac (W)	1440	1440	1440	1440
Rated voltage (V)	110-120	110-120	110-120	110-120
Max water pressure (psi)	150	150	150	150
Weight empty (lbs)	13.89	17.64	20.94	27.12
Amperage (A)	12	12	12	12
Phases	1	1	1	1

Capacity (gal)	1.5	2.5	4.0	6.0
A (in)	14.40	16.18	17.40	19.99
B (in)	9.71	10.91	12.28	13.86
C (in)	9.63	10.94	12.65	14.19

GENERAL INFORMATION

Electric Mini-Tank water heaters can be used in most under-the-counter, point- of-use applications. The models are designed to supply hot water for all handwashing and kitchen sinks. The units can replace traditional central hot water heaters thereby, conserving water and reducing energy waste. Electric Mini-Tank water heaters are lightweight, compact and manufactured for easy installation. The models are designed to be mounted on the wall. Units operate at 150 psi maximum water pressure.

CAUTION:

The manufacturer cannot be responsible for damage caused by improper installation or by failure to follow instructions in this manual. Comply with “Installation Instructions” before connecting to electrical supply.
The thermostat temperature setting range is between 50°F (10°C) and 140°F (60°C). The thermostat has been pre-set by the manufacturer in the OFF position and will need to be adjusted on commissioning. It is recommended not to exceed 125°F (51.7°C) to reduce the risk of scald injury.
Hydrogen gas is produced in a hot water system served by this heater that has not been used for a long period of time (2 weeks or more). Hydrogen gas is extremely flammable. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. When hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. There should be no smoking or open flame near the faucet at the time it is open.

WARNING: Installer should review the contents of this manual with the owner upon installation. The manual should remain with the owner and placed in a location close to the water heater.

INSTALLATION INSTRUCTIONS

All state and local codes must be adhered to. The manufacturer will not be liable for any damages because of failure to comply with these installation instructions or because of improper installation performed by an unqualified installer.
Choose a location that allows ease of access for maintenance or servicing, ideally installed at least 8” to 9” from the ceiling (inside top of cabinet) or any adjacent walls. Fasten the supplied mounting bracket to the wall. Use screws that are suitable for the wall material and the weight of the water heater filled to capacity (1.5 gal capacity = 25 lbs., 2.5 gal capacity = 37 lbs., 4.0 gal capacity = 52 lbs., 6.0 gal capacity= 80 lbs.). Hang the water heater on the bracket and pull downwards on the water heater to ensure that both “fingers” of the bracket are seated in the mounting slots. Confirm your water piping orientation (hot and cold) before wall mounting. ONLY INSTALL IN VERTICAL POSITION. Heater can sit on the floor. Some units may be installed under the sink. Confirm water piping orientation before finalizing installation. ONLY INSTALL IN VERTICAL POSITION.

PLUMBING CONNECTIONS

Connect the cold water inlet pipe to the inlet nipple (marked with a blue ring) and the hot water outlet pipe to the outlet connection (marked with a red ring).

IMPORTANT:
If Water pipes are copper or bronze, use dielectric connections to prevent corrosion. Failure to provide dielectric insulation may result in the premature tank or nipple failure and may void your warranty. Ensure that the water heater is installed in a level position. Install a shutoff valve on the cold water side of the water heater. The valve is for servicing and should be in the open position when the water heater is in operation. In order to protect the water heater from heat damage due to soldering, solder a piece of tubing to a threaded UNION fitting before screwing the UNION to the tank. DO NOT APPLY HEAT DIRECTLY TO INLET OR OUTLET CONNECTIONS.

TEMPERATURE AND PRESSURE RELIEF VALVE

CAUTION:

To reduce the risk of excessive pressures and temperatures in this water heater, install temperature and pressure protective equipment required by local codes and no less than a combination temperature and pressure relief valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials, as meeting the requirements for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22. This valve must be marked with a maximum set pressure not to exceed the marked maximum working pressure of the water heater. Install the valve into an opening provided and marked for this purpose in the water heater, and orient it or provide tubing so that any discharge from the valve exits only within 6 inches above, or at any distance below, the structural floor, and does not contact any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstances.
Install a discharge pipe from the temperature/pressure relief valve terminating at a sink or drain. DO NOT CAP OR PLUG THE END OF THE DISCHARGE PIPE. THE DISCHARGE PIPE MUST BE UNOBSTRUCTED AND FULL SIZED.
The T/P valve is certified by a nationally recognized test lab that maintains periodic inspections of the listed equipment and meets the requirements for relief valves and automatic shut off devices for hot water supply systems ANSI Z21.22.
The T/P valve is marked with a maximum pressure, which does not exceed the maximum working pressure of the water heater (150 PSI).
Install the T/P valve into the threaded opening at the top of the water heater marked “TPR” and orient the discharge tubing so that any discharge from the valve will exit within 6 inches above, or at any distance below the structural floor, and cannot contact any live electrical part.

T/P VALVE DISCHARGE PIPE

Must NOT be smaller in diameter than the outlet diameter of the valve, or have any reducing couplings.
Must NOT be plugged or blocked.
Must be made of suitable material for hot water.
Must NOT be over 15’ in length.
Must NOT have more than two elbows.
Must terminate at an adequate drain.
Must NOT have a shut-off valve between the relief valve and tank or relief valve and termination of discharge.

CLOSED SYSTEM THERMAL EXPANSION

Periodic discharge of the T/P relief valve or failure of the element gasket may be due to thermal expansion in a closed water supply system. The water utility supply meter may contain a check valve, backflow preventer or water pressure reducing valve which will create a closed water system. During the heating cycle of the water heater, the heated water expands causing pressure inside the water heater to increase. The T/P relief valve may discharge hot water under these conditions which results in a loss of energy and a buildup of lime on the relief valve seat. To prevent this from happening, there are two recommendations:

Install a diaphragm-type domestic hot water expansion tank (suitable for potable water) on the cold water supply line. The expansion tank must have a minimum capacity of 1.5 U.S. gallons for every 50 gallons of stored water.
Install a 125 PSI pressure relief valve in the cold water supply line. Make sure the discharge of this valve is directed to an open drain and protected from freezing. Contact the water supplier or local plumbing inspector for information regarding the control of this situation. Never plug the outlet of the relief valve.

FILLING THE WATER HEATER

CAUTION:

Before connecting the power, fill the tank and system with water and check for leaks. BE SURE ALL AIR IS REMOVED.
To be sure that all air is out of the water system, open the hot water faucets on your fixtures until constant water flows from them. Otherwise, any air remaining in the tank will cause the water heater element to prematurely fail.

FILLING THE WATER HEATER

Open the hot water faucet.
Open the cold water supply valve.
When continuous water flows out of the faucet, the tank is filled.
Close the hot water faucet.
Check entire system for leaks.

USING AN AERATOR
It is highly recommended that an aerator be used together with models of 1.5 gallon capacity. The purpose of the aerator is to restrict the amount of water flow exiting the unit which allows the water heater to produce hot water for a longer duration. If an aerator is not used the 1.5 gallon capacity will be depleted quickly.

ELECTRICAL CONNECTIONS

To be certain that all of the air is out of the water heater, open the hot water faucet on your fixtures until constant water flows from them. If air remains in the tank, the element will be damaged when connected to power.
Connect the water heater to a GROUNDED POWER SUPPLY.
The Mini-Tank water heater is fitted with an electrical connection that is intended to connect to a grounded 110-120 V/AC supply. Adhere to all pertinent state and local codes. Install the correct size circuit breaker into the master panel. The Mini-Tank water heater was manufactured and wired in accordance with UL requirements.
The water heater is equipped with an overheat limiting device with a manual reset. Also known as the temperature high limit, this device has been factory installed to interrupt the power supply in the event of a thermostat failure.
THIS WATER HEATER IS DESIGNED FOR ONLY 110-120V ELECTRICAL SERVICE. DO NOT CONNECT TO HIGHER OR LOWER VOLTAGE.
Failure to use proper voltage may result in personal injury and/or property damage. If the supplied electrical connection is either damaged or not long enough, do NOT use an extension cord. Have a licensed electrician replace the power cord.

INSTRUCTIONS FOR USE

CONGRATULATIONS: You are now ready to use your water heater. Run the hot water at a nearby sink and evaluate the hot water temperature. Make any temperature adjustment using the section below.

SETTING THE THERMOSTAT

The mini tank water heater is equipped with an adjustable thermostat that once set will automatically control water temperature. The red indicator lamp remains illuminated while the water is being heated. If the water in the tank is at the desired temperature the lamp will NOT be illuminated.
The temperature adjusting knob will increase the temperature by turning the knob clockwise and decrease the water temperature by turning the knob counterclockwise.
When not being used for a lengthy period of time, you can conserve energy by reducing the water temperature setting.

FREEZE PROTECTION

When the water heater is not being used for an extended period of time and there is a risk of freezing, disconnect power and drain the water heater.

MAINTENANCE INSTRUCTIONS

Always disconnect power when the supply water line is turned off or when servicing or draining the water heater. Before calling for service, first confirm that the water heater is properly filled and that 110VAC power has not been interrupted.
WARNING: Before servicing or cleaning the water heater, turn off the POWER switch and disconnect power.
NOTE: Before performing maintenance, turn off the POWER switch, disconnect power, and drain all water from the mini tank.

DRAINING AND REMOVING THE WATER HEATER

Disconnect power from the water heater.
Open a hot water faucet to let hot water run out. Allow water to flow until water is no longer hot.
Turn off the cold water supply to the water heater.
Close the hot water faucet.
Disconnect the water heater from both the hot and cold water connections.
If possible siphon out the remaining water from the tank
Carefully detach the water heater from the wall.
Tilt the water heater to drain remaining water out of the heater.

CHANGING THE THERMOSTAT

Turn off the POWER switch and disconnect the water heater from the power supply.
Drain the water heater and remove from the wall (see above).
Remove the bottom panel of the water heater.
Remove thermostat knob and unscrew two retaining screws. It may be necessary to pry the knob off of the thermostat spindle. Now remove front panel.
Disconnect the push-pull wire connectors on the thermostat noting which connector goes to which terminal. Terminals are marked.
Remove the thermostat and ECO High Limit Switch probe from the well at the heating element.
Install new thermostat, attach wires and tighten screws.
Reinsert the thermostat probe and ECO High Limit Switch probe into the well at the heating element.
Reconnect the thermocouple probes of the Thermostat and Hight Limit switch to the bracket with zip ties or equivalent (shown below).

Attention.
The thermostat probe and ECO are located within the same well at the heating element. For best performance from the thermostat controllers, the position of the High Temperature Limit Switch and the Thermostat probes are very important. Please refer to the diagram below indicating the correct installation position.

RESETTING THE HIGH LIMIT SWITCH

For various reasons the high limit safety shut-off switch will occasionally shut the water heater down. This shut down will occur when water temperatures exceed 190F. Power is automatically turned off to the heating element. The shut off device may activate as a result of a power outage or an electrical storm.

NOTE:

Do not attempt to reset the high limit switch without first allowing the water heater to cool down the high-temperature water inside the heater.
A lower temperature setting saves energy and reduces the risk of scalding.

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

WARNING:

Do not tamper with the reset button to override overheating shut down.
It is recommended to turn off the power switch and consult with a licensed technician in the event the high limit safety shut off switch may have turned off the heater. To ensure the high limit safety shut off switch is reset, press the “Reset” Button marked on the front of the appliance and located below the temperature adjusting dial

REMOVING THE HEATING ELEMENT

Turn off power supply, disconnect water heater from power and drain (see above).
Remove cover.
Remove all the line wires from the heating element.
Unscrew the heating element retaining nuts.
Remove the element.

DESCALING THE HEATING ELEMENT

Scale deposits can affect the heating capability of the element. Heavy scale can even cause the element to burn out. The element can be descaled chemically or manually.

Remove the heating element (see above).
To descale chemically, soak the heating element in white vinegar or other descaling solution and then rinse well with fresh water.
To descale manually, let the element dry and then using a non-metallic brush similar to a toothbrush; brush the residue from the element. Avoid damaging the surface of the element.
- At this time inspect your anode rod for degradation
- The anode installed in your water heater will slowly dissipate whilst protecting the tank.
- The life of the cylinder may be extended by replacing the anode.
- The anode must be inspected (and replaced if there is any sign of depletion) within five (5) years of its installation, and within every three (3) years thereafter.
Reinstall the element and gasket.
Refill tank with water before turning on the power to the water heater.

REPLACING THE HEATING ELEMENT

Disconnect power and drain the water heater (see prior instructions).
Remove heating element noting original positions of all connections.
Install new element with gasket making sure the new element and gasket are positioned correctly. Make sure the Arrow marking on the Heating Element is facing towards the Front Cover (see figure above).
Tighten retaining nuts and make the wire connections to their original locations.

TROUBLESHOOTING

In the event any of the following conditions occur, follow the troubleshooting instructions noted below to resolve.

WATER DOES NOT GET HOT

Make sure the power supply is on and working.
If the light does not come on, check that the reset button is pushed in; follow steps from previous section.
If the indicator light is illuminated, but water temperature does not get hot at the sink, test for a plumbing crossover as follows; shut off cold water supply to water heater and open hot water tap.There should be no water flowing. Any continuous flow indicates a cross over which will affect the temperature and will need to be corrected.
If there is no crossover, then replace the heating element (see previous sections).

INDICATOR LIGHT NOT ON

If the light does not come on, but water gets hot, check for faulty bulb.
Check reset button; follow steps from the previous section.

BROWN WATER

Brown or rusty water indicates a “spent” anode rod. Replace anode rod.
Also validate incoming water supply is potable water.

ODOR IN WATER

Odor in water could be due to an unusual reaction between local water and the heater’s anode rod. Check anode rod.

WATER IS TOO HOT

Turn the temperature knob counter clockwise to a lower temperature setting. If the temperature does not lower within 60 minutes, then replace the thermostat.

WATER IS NOT HOT ENOUGH

Under Instructions for Use, see “Setting the thermostat”.

WATER IS LEAKING

Turn off power switch and disconnect water heater from 110 VAC power supply.
Check water fittings and T&P fitting in the top of the tank.
Remove cover and inspect heating element gasket.

SPARE PARTS/ ELECTRICAL DIAGRAM

*Item*	*Description*	*Part Number*	*Tank Size*
1	Power Cable SJT 3×16 AWG NEMA 5-15P Plug	VN0214008K	1, 2.5, 4, 6
2	High Limit Switch 85 Deg C	VN0203302K	All
3	Thermostat – Capilliary 0-60 Deg C	VN0203015K	All
4	Wire Harness Assy 15A L250 mm	VN0211714K	All
5	LED PCB 70mm Pitch	VN0200101K	All
6	Element Straight Incoloy 31 x 34	VN0201101K	1
6	Element Straight Incoloy 31 x 34	VN0201102K	2.5, 4
6	Element Straight Incoloy 40 x 48	VN0201105K	6

ABOUT YOUR ELECTRIC MINI-TANK WATER HEATER

Congratulations on the purchase of your electric mini-tank water heater! To get the best performance and energy savings from your electric mini-tank water heater, it is important that it is installed in accordance with our instructions and the electrical and plumbing codes applicable to your area, and that you read this manual thoroughly for important operating instructions and tips.
If you have questions at any time, please contact:
Manufacturer’s National Service Department
400 Captain Neville Dr. Waterbury, CT 06705
If you require assistance from our Technical Service Department, make sure you can identify this electric mini tank water heater by having the model no:____ and serial number:_____ .