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Heat Pump Water Heaters

heat pump water heaterTens of thousands of Mainers own heat pump water heaters. They’re popular because they produce lots of hot water, help dehumidify, and can save more than $500 per year in electricity.* 

$950 Instant Discount

Heat pump water heaters work like air conditioners, but rather than moving heat from the room to the outdoors, they move heat from the room into the water tank.

Heat pump water heaters are sometimes called “hybrids” because in addition to a heat pump, they have traditional electric resistance heating elements for times when demand exceeds what the heat pump can produce.

Financial Example

Traditional Electric
Water Heater
Heat Pump
Water Heater
Savings
Warranty6 years10 years
Capacity40 gallons50 gallons
Retail Price$434$1,399
Instant Discountn/a-$950
Cost Before Tax Credit$434$449
Federal Tax Credit (30%)$0-$135
Final Purchase Cost$434$314$120
Annual Electricity Cost ($/year)*$792$214$578

Benefits

  1. They produce lots of hot water.
  2. They can save more than $5,000 over the life of the unit compared to traditional electric water heaters.*
  3. They typically have 10+ year warranties.
  4. They help dehumidify.

* Compared to a traditional electric water heater as shown on Efficiency Maine’s Compare Water Heating Costs calculator as of 4/24/2025. Your cost and savings may vary.

Take Action

  • If your electric water heater is more than ten years old, replace it now while incentives are available. Don’t wait for it to break.
  • Install a heat pump water heater yourself or use our online tool to find a participating installer.

Things to Consider

  1. Because of their noise and cooling effect, heat pump water heaters are better suited to basements than living spaces.
  2. They complement, but do not replace, dehumidifiers because they operate based on hot water demand not humidity levels.
  3. Condensate from the heat pump water heater must be drained, usually to a sink, drain, sump pump pit, etc.
  4. For optimum efficiency, install units in 10’ x 10’ or larger rooms with temperatures above 35°F.
  5. Recommended clearances from walls and ceilings should be followed to ensure adequate air circulation and access.
  6. Insulate the first few feet of incoming and outgoing pipe to minimize heat loss.
  7. Air filters should be rinsed regularly.

Water Heating

  • About Heat Pump Water Heaters
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