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Eemax Whole House Electric Tankless Water Heaters

Eemax Whole House Series Three Electric Tankless Water Heaters
Eemax Whole House Series Three Electric Tankless Water Heaters

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Eemax Whole House Series Three Electric Tankless Water Heaters

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Series Three model for smaller residential and commercial applications in bathrooms, summer cabins, apartments, kitchens and vacation homes. Can handle up to 2 full baths at a time with three heating module design.

Why Green

  • Reduces energy consumption
  • Does not require fossil fuels

Expert Rating:


An Eemax whole house tankless hot water heater can be a great solution to your residential water and energy saving needs. These on demand hot water heaters create clean, hot water instantly for showers, sinks, dishwashers and kithens, rather than storing in a large tank. Each of the three models we offer are easy to install and can handle multiple fixtures throughout a residential or commercial area. Hot water is delivered efficiently and quickly because of the power control system that samples input and output temperatures, flow rates and power when in use. A state of the art, durable tankless water heater will quickly pay for itself over time and supply ample benefits for your wallet, home, environment and well-being.
According to the U.S. Department of Energy, water heating uses up to 25% of the energy in U.S. homes and is the second largest energy expense in households. The majority of these homes use a large storage tank water heater that slowly heats up and stores hot water for your shower, sink, kitchen and appliances such as the dishwasher. When this stored water is not being used, it loses heat and then has to be reheated to maintain a pre-set temperature. This constant cycle requires the tank to be full and use 24-hour energy consumption to keep the water heated. It only seems logical to turn off this hot water that is being stored when it is not needed. A compact tankless water heater has no storage tank and is activated only when there is a demand for hot water, thus reducing energy consumption and costs by up to 50%.


  • Cuts energy waste - 99% efficient, flow switch activates heater only on demand (no standby heat loss as compared conventional storage tank heaters)
  • 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
  • Compact size and design - can be installed at point of use, saving space
  • Easy installation – Must be mounted on wall. Only one cold or hot water line needed, integral compression fittings for 1/2" pip (5/8”OD) on bottom (no sweat connections)
  • Thermostatic control – microprocessor helps insure accurate outlet temperatures (can be fed with hot or cold water)
  • Engineered to turn on in stages – uses only needed energy for amount of flow required
  • Prevents Legionella bacteria growth
  • Reduces liming, calcification and sedimentation
  • Complies with handicap requirements
  • Ni Chrome Element: - a unique, patented flow path ensures optimum heat transfer and extended element life
  • High temperature limit switch - protects against element burn out, with reset button
  • Microprocessing temperature control (+/-1°F) accuracy, adjustable range 100°F – 140°F
  • Ruggedly designed for decades of reliable operation. Constructed of high strength reinforced “engineering plastic”
  • Field Serviceable Elements replaceable cartridge element
  • Operating pressure - min 25 PSI, max 150 PSI
  • LEED certified

Model Choices

Eemax Whole House Series Three Electric Tankless Water Heaters
Eemax Whole House Series Three Electric Tankless Water Heaters

Eemax Whole House Series Three Electric Tankless Water Heaters

    3 Series Booster Application Diagram
    3 Series Set Up Diagram Click to enlarge
    • For use with several outlets and features three thermostats cold/hot water feeds, staged (Can handled up to two showers at a time)
    • Minimum switch on flow rate 0.7 GPM, 4 GPM maximum
    • Element – triple replacement cartridge inserts
    • Digital Thermostat Readout Option: easy-to-adjust external temperature control with LED readout on outside of unit (do not have to remove hardware in order to adjust temperature if needed)
    • Size – 15 1/4" x 12 1/4" x 4 1/4" (Weight: 12 lbs)
    • EX280T2T model: 240 Volts, 28kW, 120 (3x40) Amps
    • Series Three units are ideal for: residential showers, entire bathrooms, smaller houses, condos, summer cabins, and apartments. They will also accommodate industrial boosters, higher flow rate applications (such as wash down stations) and higher flow rate accurate temperature control applications (such as photo labs). Can handle up to 2 full baths and kitchen.

Eemax Whole House Series Four Electric Tankless Water Heaters
Eemax Whole House Series Four Electric Tankless Water Heaters

Eemax Whole House Series Four Electric Tankless Water Heaters

    • For use with several outlets and features four thermostats cold/hot water feeds, staged (Can handled up to three showers at a time)
    • Minimum switch on flow rate 0.7 GPM, 6 GPM maximum
    • Element – four replacement cartridge inserts
    • Size – 20 3/16" x 12 1/8" x 4 1/8" (Weight: 23 lbs)
    • EX380T2T model: 240 Volts, 38kW, 160 (4x40) Amps
    • Series Four units are ideal for: residential showers, entire bathrooms, smaller houses, condos, summer cabins, and apartments. Can handle up to 3 full baths and kitchens.


The Eemax Series Two heater is specifically designed to take in cold water and heat it to temperatures suitable for normal domestic usage up to a maximum of 140°F (60°C). To obtain optimum performance and energy savings, the unit should be located as near as possible to the point of use. The Series Three heater must have three dedicated independent 240V or 208V circuits, using correctly rated wires and circuit breakers. This unit should be mounted as close to the point of use as possible. For example, directly beneath the sink is ideal. Do not install the heater above a faucet or “point of use” because the siphoning effect may drain the heater which can cause premature element burn out. Leave a minimum of 8” above the unit for easy replacement of the heating element if needed.

IMPORTANT: Before switching “on” the power at the breaker make sure that the hot water circuit is free of air pockets or premature failure of the heating element will occur. To do this open all hot water faucets one at a time for a minute or two until the water flow is continuous and free from “gulping” or visible air pockets. For example, this procedure should always be completed before use if you the water had to be turn off temporarily for safety purposes (during a water main break) or if voluntarily turned off (while away for long periods of time).

How it Works

Tankless water heaters allow you to heat up water for your fixture without the use of a storage tank. As a result, there are no longer standby heat losses that occur with standard storage water heaters. When the hot water tap is turned on, cold water travels through the pipe into the tankless unit and uses an electric element to deliver a constant supply of hot water. This sophisticated electrical sensor gathers the flow rate of the water and incoming water temperature. It then calculates the amount of power needed to heat the water at a certain temperature point. The water flows through the heating element and exits through the faucet, tap or pipe at a desired temperature. This entire process happens almost instantly. No more waiting for a storage tank to fill up with enough hot water.

Please note that some smaller tankless water heaters cannot supply hot water for multiple uses in large households. For example, running the dishwasher and taking a shower may provide limited hot water. If needed, “whole house” type tankless water heaters or installing two or more water heaters connecting to separate fixtures and appliances can resolve this issue

Product Usage

In general, the key to selecting the proper model is to understand the flow rates of your fixtures, the temperature of incoming water, electric service provided and applications (for example, how many faucets and appliances you wish to use at the same time).

  • Applications: - determine where exactly you want hot water throughout the home, office or area. For example, one bathroom or kitchen sink (single point model), a shower and sink, multiple kitchen sinks (multi-point/phase model) or an entire home, apartment or condo (whole house model). You can also install one heater for different zones throughout your home in order to heat the water.
  • Flow rates - it is helpful to measure and know the flow rates at your faucet, showerhead and other outlets to get a better estimate of your flow rate needs. A maximum flow rate of 3 GPM is generally sufficient for standard bathroom/kitchen faucet or showerhead applications.
    It is important to get the best estimate since tankless water heaters will generate a temperature rise based on the flow rate demanded.
  • Incoming water temperature - it is important to factor in your ambient incoming water temperature based on where you live. For example, there may be a difference on how much temperature rise you will need in order to receive the desired temperature of your hot water in colder climates as compared to warmer areas down south.
  • Electrical Service - Simply inspecting the main breaker in your electrical panel can help determine how many amps of electrical service your home provides. Our single phase tankless electric water heaters generally require 240 – 277 volts and 20 – 40 amps (depending on model).
Based on the many factors involved in finding the right model, we do suggest having a qualified, licensed plumbing contractor to assist with determining your needs, fulfilling building code requirements and installation.

Typical Flow Rates in Gallon per Minute (GPM)
Fixture Type Lavatory Bathtub Shower Kitchen Sink Bar/Pastry Sink Laundry Sink Dishwasher
Flow Rates 0.5 2.0-4.0 1.5-3.0 1.0 - 1.5 1.5 - 2.5 2.5 - 3.0 1.0 - 3.0

Flow Rate (GPM) = kW rating x 6.83
rise in temp (°F)
Rise in Temp (°F) = Rise in Temp (°F)
kW rating x 6.83)
kW Rating = GPM x rise in temp
rise in temp (°F)



Full factory warranty – heaters are guaranteed against failure due to leaks of “Heater Body/Element Assembly” for a period of 5 years.


Here are some simple facts about the standard tank type water heaters that are present in the majority of homes: the tank, which can hold 20 to 80 gallons of water, cycles on and off all day long to keep the water hot. As a result, this wastes lots of energy and money even when it’s not in use. When hot water runs out, the tank has to refill before it is ready to supply hot water. Storage tanks are large and take up space, more expensive to operate, more likely to rust and leak and typically have a lifespan of 10-12 years.

A tankless electric water heater is a compact unit that provides hot water only when needed. The second the faucet or outlet is turned off the heater is turned off, no need to have standby water. As a result, there is an increase in energy efficiency (10 to 20% greater as compared to storage tank heaters), a decrease in your energy bill and an unlimited supply of hot water. Furthermore, each tank has a life expectancy of about 20 years (with no chance of a tank breaking down and then flooding the basement). Overall, if you choose the correct model and size for the application(s) you want, in the end a tankless hot water heater will save energy and money.

Make Selections

This page features our catpages-energy savings inlcuding Eemax Whole House Series Three Electric Tankless Water Heaters and Eemax Whole House Series Four Electric Tankless Water Heaters.