What To Consider Before Purchasing An Electric Tankless Water Heater
Unlike a gas tankless water heater, the electric models require no venting and have no combustion air requirements, however an electric tankless water heater must be hard wired and have minimum amperage requirements. The most important factor in installing an electric
tankless water heater is ensuring you can meet the amperage requirements.
Some of the water heaters we carry such as the Ariston and AO Smith water brands
are not tankless units but rather small tanks or mini-tanks that store a supply
of hot water.
If you are needing to support more than one major water application at the
same time such as 2 showers or a shower and a washing machine, then you should
go with a gas tankless water heater as the electric models are not strong enough
to support that type of water flow.
Lastly, please review the electrical requirements for each unit. All the
Powerstar units require a 240 Volts and a minimum of 50 amps. The larger
units such as the AE125 require a minimum electrical service of 200 amps.
Please ensure that you have adequate electrical capacity to operate these units.
Electric Tankless Requirements
PowerStar AE12 – designed to
provide endless hot water for sink use.
The maximum water flow is 1.5 gallons per minute and unit draws 50 amps.
PowerStar AE115
– can
support one major hot water application (i.e. shower) at a time in a warm
environment. To see where the AE115 can be used reference our
climate map. This model has two heating elements and each requires its
own 40 amp breaker, so the AE115 requires 2 separate 40 amp breakers and a total
minimum electrical service of 150 amps.
PowerStar AE125
– can
support one major hot water application (i.e. shower) at a time in warm and cold
environments. This model has three heating elements and each
requires its own 40 amp breaker, so the AE125 requires 3 separate 40 amp
breakers and a total minimum electrical service of 200 amps.
Stiebel Tempra 24
– provides up to 4.10 gallons per minute (40 degree temp rise) for water usage
at 105° F: 2 sinks or 1 shower. Requires 2 independent 240V AC circuits
protected by 2 separate and independent 60 amp double pole breakers. Minimum
recommended electrical service is 180 amps.
Stiebel Tempra 29
- supplies up to 4.75 gallons per minute (40 degree temp rise) for water usage
at 105° F: 2 showers (warm climate) or 1 shower (cool climate). Requires 3
independent 240V AC circuits protected by 3 separate and independent 50 amp
double pole breakers. Minimum recommended electrical service is 200 amps.
Stiebel Tempra 36
- delivers up to 6.10 gallons per minute (40 degree temp rise) for water
usage at 105° F: 2 showers & 1 sink. Requires 3 independent 240V AC
circuits protected by 3 separate and independent 60 amp double pole
breakers. Minimum recommended electrical service is 300 amps.
Additional Information on Tankless Water Heaters?
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