Does a heat pump water heater make the room cold?

It cools the space a little, because it pulls heat from the surrounding air. ENERGY STAR cites a 2022 field study of 81 homes with basement units that found an average room temperature drop of about 2.3°F, and most homeowners did not notice. In summer that cooling and drying can be a bonus in a basement. In a small closet, a louvered door or a duct kit helps the unit get enough air.

How long does a heat pump water heater last?

ENERGY STAR says heat pump water heaters are typically cited as lasting 13 to 15 years, compared with about 10 to 12 years for a traditional storage water heater. Its savings estimates assume a 13-year life. Check the warranty, since ENERGY STAR certified models must carry at least a six-year warranty on the sealed system. Flushing the tank and cleaning the air filter as the manual describes helps the unit last.

Can a heat pump water heater go in my garage?

Often yes, if the garage stays between about 40°F and 90°F most of the year. In a garage that drops below that range for long stretches, the unit will rely more on its backup electric elements and save less. Split models with an outdoor compressor, which ENERGY STAR says can work down to -25°F, are another option for cold garages or tight spaces. Ask your installer about your winter garage temperatures.

Is a heat pump water heater loud?

It makes a steady hum when the compressor and fan run. ENERGY STAR says most new models run between 45 and 60 decibels, roughly from a quiet kitchen refrigerator to a modern window air conditioner. That is usually fine in a basement, garage or utility room. Avoid placing it right next to a bedroom, and ask about sound reduction kits if the unit will sit near living space.

What size heat pump water heater do I need?

Start with your busiest hour of hot water use, such as back-to-back morning showers plus a dishwasher, and choose a model whose first hour rating covers it. Heat pump water heaters recover more slowly in efficiency mode than gas tanks, so ENERGY STAR advises sizing up when replacing gas, for example from 40 to 50 gallons or 50 to 65 gallons. Larger households usually need 65 or 80 gallons.

Can I install a heat pump water heater myself?

It is possible for skilled DIYers, but most homeowners should hire a licensed plumber or electrician. The job involves water lines, a condensate drain, often a new 240-volt circuit and sometimes a permit. Many local codes and utility rebate programs also require a permit, a licensed installer or a thermostatic mixing valve. Some rebates and warranties require professional installation, so read the terms first.

What do the different operating modes do?

Most units offer several modes. Efficiency or economy mode uses only the heat pump and saves the most energy. Hybrid or auto mode, the usual default, uses the heat pump first and adds the electric elements when demand is high. Electric mode uses only the elements and is the least efficient. Vacation mode keeps the tank from heating while you are away. Hybrid works well for most households.

Do heat pump water heaters work in cold climates?

Yes. ENERGY STAR says they work efficiently even in cold climates as long as the surrounding air stays at or above about 40°F, which most basements in places like Maine meet. Below the compressor's limit, the unit switches to its electric elements and keeps making hot water, just less efficiently. Colder incoming water in winter also means slightly more energy use in those months.

Heat Pump Water Heater Savings and Sizing (2026)

A heat pump water heater is one of the simplest ways to cut a large, often overlooked part of your energy bill. The Department of Energy says water heating accounts for nearly 20% of the average home’s energy use and is typically the second-largest energy expense after heating and cooling. This guide covers how much you can save, how to size and place the unit, what installation involves, and how it compares with gas and tankless options.

How does a heat pump water heater work?

A heat pump water heater works like a refrigerator in reverse. A small compressor and fan pull heat from the surrounding air and move it into the water tank. Because it moves heat instead of making it, it uses far less electricity than a standard electric tank. Most models also have backup electric elements for busy times.

ENERGY STAR calls these units “hybrid” water heaters because they switch to standard electric resistance heat automatically during periods of high hot water demand. Most have a control panel with several modes:

Efficiency or economy: heat pump only, for the biggest savings.
Hybrid or auto: the usual default, using the heat pump first and the elements when needed.
Electric: elements only, the least efficient setting.
Vacation or timer: on some models, pauses heating while you are away.

How much can a heat pump water heater save?

ENERGY STAR estimates a certified heat pump water heater saves a household of four about $550 a year compared with a standard electric water heater, and more than $5,610 over its life. Smaller households save less because they use less hot water. Savings versus gas depend on local gas and electricity prices.

Here is ENERGY STAR’s savings table, which assumes electricity at 14.6 cents per kWh, an extra purchase cost of $1,503 over a standard electric model, and a 13-year life:

Household size	Electricity saved per year	Dollars saved per year	Payback on extra cost	Lifetime savings
2 people	1,880 kWh	$270	5.5 years	$2,050
3 people	2,820 kWh	$410	3.7 years	$3,830
4 people	3,760 kWh	$550	2.7 years	$5,610

Source: ENERGY STAR, Savings and Benefits, checked October 2026.

Electricity now costs more than that 14.6-cent assumption in much of the country. The U.S. average residential price was 17.30 cents per kWh in 2025 (EIA, annual average for 2025). At higher electric rates, every kWh saved is worth more, so the dollar savings for an electric-to-heat-pump swap tend to grow. To check your own case, multiply the kWh savings for your household size by the rate on your bill.

Yearly savings vs a standard electric tankThe more people in the home, the faster a heat pump water heater pays back: about $550 a year for a household of four.

Source: ENERGY STAR, Heat Pump Water Heater Savings and Benefits (as of October 2026).

View data as table

Household size	Dollars saved per year (14.6¢/kWh)
2 people	$270/yr
3 people	$410/yr
4 people	$550/yr

What about replacing a gas water heater?

The math is less clear-cut when you replace gas. Your gas bill drops, but your electric bill rises. Whether you come out ahead depends on your local gas and electric rates. ENERGY STAR says heat pump water heaters use up to 70% less energy than traditional gas systems, and they also remove a combustion appliance from your home. Ask your installer to estimate annual operating costs for both options using your actual rates.

Example: yearly cost to heat 50 gallons a dayExample at 18¢/kWh and $1.35/therm: a heat pump water heater costs about a quarter as much to run as a standard electric tank, less than a gas tank and about the same as gas tankless.

Source: Worked example, Home Energy Guide Hub water heater cost calculator (50 gal/day, 55°F inlet, 120°F tank); default prices from EIA (as of October 2026).

View data as table

Water heater type	Annual energy cost
Heat pump (UEF 3.5)	$149/yr
Gas tankless	$144/yr
Gas storage tank (UEF 0.64)	$209/yr
Electric storage tank	$561/yr

How do I size a heat pump water heater?

Size a heat pump water heater by your busiest hour of hot water use, not just by tank gallons. Look for a first hour rating (FHR) that covers that peak hour. Because heat pumps recover more slowly than gas burners in efficiency mode, ENERGY STAR advises sizing up one step when you switch from a gas tank.

A simple sizing process:

Pick the busiest hour in your home, usually weekday mornings or evenings.
List what runs in that hour: showers, a bath, the dishwasher, a laundry load, kitchen use.
Ask your installer or check the manufacturer’s sizing guide to turn that list into gallons.
Choose a model whose FHR meets or slightly exceeds that number.
If you are replacing gas, consider the next size up. ENERGY STAR gives examples of moving from 40 to 50 gallons or from 50 to 65 gallons.

Heat pump water heater tanks typically range from 40 to 80 gallons, according to ENERGY STAR. Larger tanks cost more, but ENERGY STAR cautions against choosing a tank size based on price alone, since an undersized unit will lean on its less efficient electric elements.

Where can a heat pump water heater be installed?

A heat pump water heater needs a space that stays between 40°F and 90°F year-round, enough surrounding air to draw heat from, a place to drain condensate, and room for service. Basements, garages in mild climates and large utility rooms are common choices. Small closets may need a louvered door or a duct kit.

ENERGY STAR’s product page suggests providing about 1,000 cubic feet of air space around the unit. Its installation cost article gives a minimum of at least 450 cubic feet, roughly an 8-by-8-foot utility closet, and adds that some manufacturers require more. Follow the installation manual for the specific model you buy.

Other placement points to plan for:

Condensate. The unit pulls moisture out of the air. The water must drain to a floor drain or a condensate pump.
Cooler air. The unit exhausts cooler air. ENERGY STAR cites a 2022 field study of 81 homes with basement units that found an average room temperature drop of 2.3°F.
Noise. ENERGY STAR says most new models run between 45 and 60 decibels.
Clearances. Inlet and outlet pipes and the fan need specific orientation and access.
Cold spaces. Split systems with an outdoor compressor can heat water when outdoor temperatures dip to -25°F, according to ENERGY STAR.

Do I need 240 volts, or can I use a 120-volt model?

Most heat pump water heaters run on a 240-volt circuit, like a standard electric water heater. ENERGY STAR also certifies 120-volt models designed for a 15-amp circuit, often called plug-in models. They can make a gas-to-electric switch easier, but they have a lower efficiency bar and may recover more slowly.

ENERGY STAR’s water heater criteria show the difference. A standard integrated heat pump water heater must reach a UEF of at least 3.30. An integrated model on a 120-volt, 15-amp circuit, and split-system models, must reach at least 2.20.

Option	Typical electrical need	ENERGY STAR minimum UEF	Good fit for
Integrated, 240-volt	Dedicated 240-volt circuit	3.30	Replacing an electric tank; homes with panel space
Integrated, 120-volt / 15-amp	Standard 120-volt outlet circuit	2.20	Replacing gas where adding a 240-volt circuit is hard
Split system	Varies by model	2.20	Tight indoor spaces or very cold locations
Standard electric tank	240-volt circuit	Not ENERGY STAR eligible	Lowest upfront price, highest operating cost

Source: ENERGY STAR Water Heater Key Product Criteria, checked October 2026.

If you replace a gas water heater with a 240-volt model, ENERGY STAR notes you may need extra breaker panel capacity and a new circuit run to the water heater location. The installer should also cap the gas line and seal the old vent opening, which reduces air leaks.

How much does a heat pump water heater cost?

ENERGY STAR reports the unit itself typically costs $1,500 to $3,000 before incentives, with split models costing several times more. An informal contractor survey it cited put labor and materials at $1,000 to $3,000 on top of the unit. A rough rule is that installation costs about as much as the water heater.

These are national rough ranges published by ENERGY STAR in 2024, so get at least three written quotes for your home. Costs rise when you need:

A new 240-volt circuit or a breaker panel upgrade.
A condensate pump because there is no nearby floor drain.
A louvered door, duct kit or carpentry for a small space.
A thermostatic mixing valve or permit required by local code.
Removal of an old gas unit, including capping the gas line and sealing the vent.

Lifespan helps the math. ENERGY STAR says heat pump water heaters are typically cited as lasting 13 to 15 years, compared with 10 to 12 years for traditional storage water heaters.

How does a heat pump water heater compare with gas and tankless?

A heat pump water heater has the highest efficiency rating of common options and usually the lowest operating cost compared with standard electric tanks. Gas storage and gas tankless models cost less to buy in many cases but burn fuel and need venting. Your best choice depends on fuel prices, space and hot water needs.

Type	ENERGY STAR minimum UEF	Needs venting?	Notes
Heat pump (integrated, 240-volt)	3.30	No	Needs air space and condensate drain
Gas storage, 20 to 55 gallons	0.81 (medium use) or 0.86 (high use)	Yes	Fast recovery; combustion appliance
Gas tankless	0.95	Yes	Endless hot water up to its flow limit; no tank losses
Standard electric storage	Not ENERGY STAR eligible	No	UEF around 0.93 per ENERGY STAR

Source: ENERGY STAR Water Heater Key Product Criteria and Uniform Energy Factor guidance, checked October 2026. UEF compares models within the same usage category, so compare similar sizes.

Efficiency rating (UEF) by water heater typeA certified heat pump water heater's minimum UEF is more than three times that of the best gas or electric tank.

Source: ENERGY STAR Water Heater Key Product Criteria; ENERGY STAR UEF guidance (as of October 2026).

View data as table

Water heater	Uniform Energy Factor
Heat pump, 240 V (ES min.)	3.3 UEF
Heat pump, 120 V (ES min.)	2.2 UEF
Gas tankless (ES min.)	0.95 UEF
Standard electric tank	0.93 UEF
Gas storage (ES min., medium)	0.81 UEF

Federal standards are also moving toward heat pumps. A DOE final rule published in 2024 requires compliance with new consumer water heater standards on and after May 6, 2029, and DOE said most new electric storage water heaters would need heat pump technology, except small units (DOE Consumer Water Heaters). Rules can change, so check that page for updates. If you want to see how water heating fits with other savings, our guide to lowering your energy bill ranks upgrades by cost.

Are there rebates or tax credits in 2026?

There is no federal tax credit for heat pump water heaters installed in 2026. The 25C credit ended for property placed in service after December 31, 2025. Utility rebates remain common, and some states offer Home Energy Rebates, but those state rebates no longer fund switching from gas to electric.

Federal tax credit

Under Public Law 119-21, the IRS says the Energy Efficient Home Improvement Credit (25C) is not allowed for property placed in service after December 31, 2025. If your heat pump water heater was placed in service in 2025, you may still claim up to $2,000 on your 2025 return using Form 5695, with the manufacturer’s Qualified Manufacturer ID. Our 2026 energy tax credit guide explains the dates. Confirm your situation with a tax professional.

State Home Energy Rebates

Under the original law, the High-Efficiency Electric Home Rebate (HEEHR) set a statutory maximum of $1,750 for a heat pump water heater for low- and moderate-income households. Your state’s program sets the actual amounts. Since DOE Program Notice 26-2 took effect on May 29, 2026, these rebates no longer fund switching from gas, oil or propane to electric, and households must address insulation and air sealing first unless already insulated to a state-set level. See our state rebate guide and your state energy office for current status.

Utility programs

Many electric utilities run their own heat pump water heater rebates or instant discounts. ENERGY STAR reported in 2024 that these often ranged from $300 to $1,000. You can search by ZIP code on DSIRE. Confirm eligibility, installer requirements and deadlines with the program before you buy.

Bottom line

A heat pump water heater can cut water heating costs sharply, especially if you have a standard electric tank today. Measure your space and its temperature, size by first hour rating, plan the electrical and condensate work, and get three written quotes. With the federal credit gone for 2026, check your utility and state programs before you buy. For heating and cooling, our heat pump cost and savings guide applies the same technology to your whole home.

Heat Pump Water Heaters: Savings, Sizing and Installation Guide

Key takeaways

How does a heat pump water heater work?