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Answering FAQs About Electric Tankless Water Heater

water heater

How to choose the right electric tankless water heater?

The water heater’s power is measured in kilowatts (kW), which usually refers to the power of the electric heating tube in the water heater. The greater the power, the more heat is generated.  This means less heating time is required and there is a higher load on the wire.

The power of common water heaters on the market are 6.5kW, 9kW, 14kW, 18kW, etc.

When purchasing an electric tankless water heater, you can choose your preferred power level for what you need, the number of faucets, and the water consumption habits.

Normally, the climate in the south is warmer and the requirements for the heat load ( power) of the water heater are lower. From an economic point of view, 14kW water heaters can meet the requirements of comfortable bathing. Meanwhile, in the north, the water temperature is lower, especially in winter when the heat load ( power) of the water heater is required to be large enough to meet the requirements of comfortable bathing, so families in the north should choose an 18kW water heater.

If you have multiple showers, choose a high-power capacity water heater or try to install multiple water heaters.

If you have a large house, install an on-demand water heater at each hot water outlet, which will provide more constant hot water while achieving energy savings of 27%–50%.

Whether the water heater can be used or not depends mainly on the local inlet water temperature and water flow -- usually measured in gallons per minute (GPM).


Average GPM Usage for Common Appliances

Description

GPM

Range

Low Flow Faucet

0.5

0.5-0.9

Bathroom Faucet

1

0.5-1.3

Kitchen Faucet

1.5

1.0-2.2

Shower

2

1.5-2.5

*The flow rate for each symbol is represented in the GPM (gallons-per-minute) column of the table above. The Range column indicates variations in GPM for faucets and showers based on manufacturer and style.

Temperature Map

First, determine your average inlet water temperature by finding your location on the map and noting the color.

For example, the average inlet water temperature in Colorado is 47°F while the average inlet water temperature in most of Louisiana is 67°F.

 

Next, determine how many applications your tankless water heater can run simultaneously by matching your color to the table below.

 

Inlet Temp (°F)

kW (Model)

GPM

Approx Usage

Outlet Temp (°F)

41

6.5

<0.7

Low Flow Faucet

104

9

<0.9

Low Flow Faucet

108

14

<1.4

Kitchen Faucet

108

18

<1.7

Kitchen Faucet

108

50

6.5

<0.8

Low Flow Faucet

104

9

<1.0

Bathroom Faucet

108

14

<1.6

Kitchen Faucet

108

18

<2.0

Shower

108

59

6.5

<0.9

Low Flow Faucet

104

9

<1.2

Bathroom Faucet

108

14

<1.9

Kitchen Faucet

108

18

<2.4

Shower

108

68

6.5

<1.2

Bathroom Faucet

104

9

<1.5

Kitchen Faucet

108

14

<2.3

Shower

108

18

<2.9

Shower

108

77

6.5

<1.5

Kitchen Faucet

104

9

<2.0

Shower

108

14

<2.4

Shower

108

18

<3.8

Shower

108

For example 1, suppose I am in California and I need a water heater for a bathroom. The inlet water temperature in my area is 72°F so I need to buy a 14kW water heater to meet my needs.

For example 2, suppose I am in California, and I have two bathrooms. Usually my friend and I have a shower at the same time, so I need to buy two 14kW water heaters, one for each bathroom.

 

What to do if there is no hot water?

If there is no hot water coming from your electric tankless water heater, please check the following points:

  1. Check if the machine is correctly installed and powered on.
  2. After powering on, check if the buttons respond well.
  3. Check if there is an error code on the screen. If so, follow the user manual instructions to eliminate it.

Show

Failure Analysis

Solution

E1

Leakage of electricity.

Contact Airthereal support for assistance.

E2

Temperature exceeds 149°F/ 65°C.

A. Select a lower power level or turn down the temperature.

B. Increase water flow.

E3

Water inlet temperature sensor failure

Contact Airthereal support for assistance.

E4

Water outlet temperature sensor failure

Contact Airthereal support for assistance.

EF

Water flow sensor got stuck.

Contact Airthereal for assistance.

 

    4. System overloading: If there is no hot water but cold water, probably it's because too many faucets are being run at once. To overcome this problem, try to use one hot water appliance or install more tankless water heaters to meet your needs.

       

      Maintenance

      The estimated lifespan of Airthereal electric tankless water heaters is 5-8 years (depending on the daily usage).

      To ensure consistent Maximum performance of the unit, it is recommended to follow these instructions:

      1. Periodically remove scale and dirt that may build up at the aerator of the faucet or in the showerhead.
      2. There is a built-in filter at the inlet connection which should be cleaned from time to time. Please cut the water supply before cleaning this filter. You can then reverse the inlet and outlet pipe connection (connect each pipe to the opposite connection) and open the faucet to manually flush the filter by opening the faucet to its max. After flushing the filter in this way, remember to reverse the pipes back to the normal connections.

       

      Is hot water from the water heater safe to drink?

      Please DO NOT directly drink the water from the water heater. The water from the faucets must have drinking water quality and untreated plumbing might have a bacteria risk, thus it is well advised to not use heated water for drinking.

       

      Support

      If you don’t see the tankless water heater problem you’re having here, or if you need technical support with your water heater, please call us at 1-725-333-0437 or email us at support@airthereal.com.


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