Eemax’s customer service is here to assist you with your electric water heater questions and concerns, starting with these frequently asked questions.


I’m not getting any hot water from my Eemax heater. What do I do?

The first thing to do is to call Eemax Technical Support at 800-543-6163. A friendly service technician will be happy to help you identify the problem and get your heater back in operation. Please have your model number and serial number available when you call so we can properly identify your unit and assist you in diagnosis and repair.

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I’m a trained service technician or a technically skilled homeowner and I need troubleshooting instructions. Where can I find them?

Eemax has troubleshooting guides on our website for your model heater. Go to product pages and download the appropriate troubleshooting guide form our technical library.

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The light on my Eemax heater comes on, but I have cold water.

In most cases, this is a sign of a failed heating element. Heating elements in Eemax tankless products are designed for easy replacement and are available from the factory and from many wholesale distributors. Consult your owner’s manual, parts page, or call Technical Support at 800-543-6163 for the proper replacement part number for your heater.

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One light on my Eemax heater is flashing, and the light on another heating chamber is on steady. Is this normal?

Yes, this is normal operation. Your Eemax heater is regulating the temperature of the water and adjusting the total output of the heater, saving you money!

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My heater “clicked” when water flowed through it, but now it doesn’t…and my water is cold. What can I do?

Eemax heaters built since early 2006 have high limit thermostats built in. To reset this device:

  • Make sure the power to the heater is turned off at the circuit breaker(s) and verify it’s off at the heater with an appropriate electrical tester
  • Remove the cover to the heater.  Depending on the model there will be one or two Phillips-head screws on the top and bottom of the cover – loosen the screws and the heater cover will pull off towards you.
  • Each grey heating chamber has a circuit board attached to it; above or below the circuit board is a high limit thermostat.  It is a small black device with (2) orange wires going to it and a small red button in the center.  GENTLY push this red button – if the thermostat is tripped this button will move in slightly…if the button does not move the thermostat is not tripped.
  • Reinstall the cover and turn on the circuit breakers.
  • Check the heater for proper operation.  If the thermostats continue to trip, call Eemax Technical Support for assistance.

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My Tank-type Hot Water Heater has a Temperature & Pressure Valve (T&P valve) – Why Don’t I Need One With My Eemax Tankless Water Heater?

Eemax heaters are fully certified by Underwriters Laboratories (UL) and T&P valves are not required for tankless water heaters. You should consult your local codes for their specific regulations.

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What Are The Electrical Requirements of an Eemax Heater?

Eemax Tankless Electric Hot Water Heaters come is a variety of electrical voltages and capacities – from 120 volts up to industrial installations with 480 volts. Please do not choose an Eemax heater by voltage alone – call Technical Support at  800-543-6163 or use our Sizing Guide to get the right heater for YOUR application.

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Do I Really Need To Install the Aerator?

Yes. The Eemax heaters expressly designed for hand washing are specifically engineered for optimal performance at a flow rate of ½ gallon per minute which is the federal standard for hand washing applications. If the ½ gallon flow-restricting aerator is not installed on the fixture, more water will flow through the heater than ½ gallons per minute and the water will not be as hot as desired. If the supplied aerator cannot be installed call Technical Service at 800-543-6163 or see our Technical Service Bulletin for an acceptable alternative.

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I Purchased an Eemax Heater and Installed It Under My Kitchen Sink. Why Isn’t My Water As Hot As I Expected?

If an Eemax heater is selected solely on the basis of the existing electrical circuit on site, the water heater will most likely be too small to deliver the hot water expected by the end user. All Eemax tankless water heaters require dedicated electrical circuits – for example, an existing circuit sized for a garbage disposal unit will only allow the installation of a very small Eemax water heater which will not be adequate for a kitchen sink application. Please refer to our Sizing Guide or call Technical Support for sizing assistance.

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My Eemax Heater is Too Hot…How Do I Turn It Down?

If you have an Eemax heater that has a “T” in the model suffix (such as EX95T or EX190TC) then the process is simple: remove the cover and find the temperature adjustment on the left side of the circuit board with the clear plastic cover and GENTLY turn counterclockwise to reduce temperature. If you have a Series Two, Three, or Four heater each heating chamber will have a circuit board – turn them all down unless directed otherwise by Eemax Technical Support. If your Series Two or Three heater has a circuit board with a BLACK cover that chamber is non-adjustable – call Eemax Technical Support for help.

If your heater model number starts with “SP” that heater is non-adjustable. We can reduce the water temperature by:

  • Increasing the flow of water in the heater by removing the .5 GPM flow-restricting aerator and installing a 1.0 GPM aerator, or
  • Reducing the heat made by the Eemax heater by installing an element with a lower kilowatt rating. Please call Eemax Technical Support for assistance.

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Do I Have To Hard-Wire The Heater? Can I Use a Plug & Cord For Power?

All Eemax tankless heaters are designed for a hard-wired installation, that is, the wiring is permanently installed to the heater at installation. The use of a plug & cord to install the Eemax heater is not permitted.

Eemax EMT1, EMT2.5, and EMT4 MiniTank models include a plug and cord. The EMT6 MiniTank model includes a pigtail.

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Where Can I Find Efficiency Rating Information?

Eemax water heaters have Uniform Energy Factors of .90 up to .99 by AHRI – the Air Conditioning, Heating, and Refrigeration Institute (https://www.ahridirectory.org/Search/QuickSearch?category=8&searchTypeId=3&producttype=15).

This means more than 90% of the energy going into the heater goes into heating the water – an extraordinary level of efficiency! Compare this to gas tankless water heaters with an energy factor of .82 and the difference is clear!

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What is a tankless water heater?

A tankless water heater has no storage tank and is activated only when there is a demand for hot water. A tank heater keeps the water hot 24 hours a day whether you use it or not. Tankless water heaters also provide unlimited hot water as there is no stored capacity to run out. Because there is no storage, the physical size of a tankless heater is much smaller allowing you to install the heater much closer to the application.

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What is the tankless advantage?

  • Compact size – can be installed at point of use, saving space and providing hot water instantly.
  • Ruggedly designed for decades of reliable operation
  • Saves money – only consumes energy when hot water is needed for up to 50% savings
  • Endless hot water – never run out of hot water again.

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How do I make sure I have the right Eemax tankless water heater for my application?

Keep in mind, a tankless water heater creates hot water based on how much power or kW you put into it. The volume of flow or how many fixtures you want to run at the same time will determine which heater is right for you. Eemax builds electric tankless water heaters that supply an unlimited supply of hot water for up to 3 showers and for your other household needs. The Sizing Guide will help you select the correct unit for your usage and climate zone. An Eemax customer service technician can also answer any questions you may have regarding sizing – call 800-543-6163.

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I Need Hot Water in a Daycare/Preschool location and Need to Limit the Temperature to Reduce Scalding Incidents….Can An Eemax Heater Help Me?

YES!!  Tank-type hot water heaters need to be set at a high temperature to limit the growth of bacteria…..which would require the use of a thermostatic mixing valve at the point of use to lower the temperature to non-scalding levels. The Thermostatic line of Eemax tankless water heaters can be set to a ‘not-to-exceed’ high limit temperature and eliminate temperamental thermostatic mixing valves.

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Will I Save Money On My Electric Bill With an Eemax Water Heater?

In virtually all cases, YES! The greatest savings will occur when replacing an oversized electric tank ( 80 gallons ) in a home with minimal hot water demand. Think about your typical hot water usage: 10 to 12 minutes in the shower, a few minutes with the bathroom lav, washing the dishes or running the dishwasher after dinner…..and the occasional load of laundry on ‘hot’…..and you quickly see there isn’t a lot of hot water demand in a typical day. BUT – your hot water tank has to be ready – 24 hours a day – 7 days a week.  All the energy spent on keeping the water in the tank hot is wasted energy. The Eemax heater only turns on when there is a hot water demand…and instantaneously heats water to meet that demand….and no more. When there is no hot water demand, there is no hot water expense!

In addition, no hot water tank means never running out of hot water again! When properly sized, the Eemax Tankless hot water heater makes all the hot water you need on demand.

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That Little Box Will Produce All The Hot Water I Need?

If your Eemax heater is sized properly for your application – YES! See our Sizing Guide for our sizing guide to select the right Eemax heater for you.

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