Heat Pump Water Heaters

Heat Pump Water Heaters

heat pump water heaterEach year, thousands of Mainers buy heat pump water heaters. ENERGY STAR® reports that these high-efficiency units can save a four-person household more than $3,000 over ten years when compared to electric water heaters. Other benefits include long warranties and ability to dehumidify.

Mail-In Rebate Instant Rebate

To understand the concept of heat pumps, imagine a refrigerator working in reverse. While a refrigerator removes heat from the food inside and releases it into the surrounding air, a heat pump water heater takes the heat from the surrounding air and transfers it to the water inside. They are called “hybrids” because in addition to a heat pump they also have traditional electric resistance heating elements for times when demand exceeds what the heat pump can produce.

Financial Example

$ 1,300 qualified heat pump water heater
$ 750 Efficiency Maine rebate
= $ 550 net price

$330/year projected savings for a four-person household*

20-month payback

Note: Your costs and savings may vary.


  • Heat pump water heaters can save more than $3,000 over the life of the unit compared to electric water heaters.*
  • They typically have 10+ year warranties.
  • They dehumidify the space they are in.

*Source: energystar.gov accessed 1/1/17

Take Action

  • Use our Compare Water Heating Options tool to estimate how much you could save with a heat pump water heater.
  • Find an installer or pick up a qualified heat pump water heater at a local retailer and install it yourself.
  • If your electric water heater is more than 10 years old, replace it now while incentives are available. Don’t wait for it to break.

Things to Consider

  • Because of their noise and cooling effect, heat pump water heaters are better suited to basements than living spaces, especially if there is extra heat available from a boiler.
  • Heat pump water heaters complement but do not replace dehumidifiers, because they operate based on hot water demand instead of humidity levels.
  • Remember that you’ll need a place to drain the condensate. This can be pumped outside or passively drained to a sink, washing machine drain, or floor drain lower than the heat pump condensate port.
  • For optimum efficiency, install a heat pump water heater in a room with a volume of at least 750 cubic feet (typical 10′ x 10′ room) where the temperature stays above 35°F.
  • Be sure to give the unit the recommended clearances from walls and ceilings to ensure adequate circulation and access.
  • Insulate the first few feet of incoming and outgoing pipe to minimize heat loss through distribution.
  • Air filters must be rinsed regularly.

Here is a video on how to install a heat pump water heater from one ENERGY STAR® manufacturer:

Click here for a heat pump water heater brochure/rebate form.

Click here for a heat pump water heater user tips guide.

Click here to see what Maine plumbers are saying about heat pump water heaters.