A heat pump water heater (also called a hybrid water heater) uses the same technology as a heat pump for your home. Instead of heating water with an electric element, it pulls heat from the air around the tank and moves it into the water. That makes it three to four times as efficient as a standard electric water heater.
How much does a heat pump water heater cost?
| Type | Unit price |
|---|---|
| 50-gallon, 240V | $1,200 – $1,800 |
| 120V plug-in models (no new circuit) | $1,500 – $2,200 |
| 65–80 gallon | $2,800 – $3,500 |
Installation usually adds $800 to $2,000 when replacing an electric tank in the same spot. Replacing a gas water heater costs more because of the new electrical circuit and condensate drain.
How much will it save?
A standard electric tank for a family of four typically costs $800 to $900 a year to run. A heat pump model with a UEF (uniform energy factor) of 3.0 to 4.0 does the same job for about $200 to $300. That is a saving of around $500 to $600 a year at average US electricity prices.
Yearly cost = hot water energy (kWh) ÷ UEF × price per kWh
Against natural gas the saving is smaller and depends on local prices, in the same way as heat pump vs furnace.
Payback
Replacing an electric tank that has failed anyway, the extra cost over a new standard electric tank is often $1,000 to $1,500. At $550 a year in savings that pays back in two to three years. Many utilities offer $300 to $1,000 rebates on top, which shortens the payback further.
What to check before you buy
- Space: most units need about 700 cubic feet of air around them (for example a 10 × 10 ft room with a 7 ft ceiling), or a louvered door or ducting.
- Temperature: the heat pump works best in spaces that stay between 40°F and 90°F, such as basements and garages in mild climates.
- Height: the compressor sits on top, so these tanks are taller than standard ones.
- Drain: it produces condensate, so it needs a floor drain or a small pump.
- Noise: about as loud as a refrigerator or a quiet dishwasher.
- Cooling effect: it cools and dehumidifies the room. That is a bonus in a humid basement and a small penalty in a heated utility room in winter.
Operating modes
- Heat pump only: lowest cost, slower recovery.
- Hybrid: uses the heat pump and switches on the electric element when demand is high. Best for most homes.
- Electric only: use if the space gets too cold or during service.
- Vacation: keeps the tank warm with minimal energy.
How long do they last?
Expect 10 to 15 years, similar to a standard tank. The anode rod should be checked every few years and the air filter on top cleaned every few months.
Is a heat pump water heater worth it?
If you have an electric water heater and space in a basement, garage or large utility room, almost always yes. If you have cheap natural gas, it is closer; compare local prices before deciding.