What I learned about what to buy, how to save and what to avoid before plugging in a heat pump water heater.
April 7, 2026 at 5:00 a.m. EDT
Today at 5:00 a.m. EDT
Column by Michael J. Coren
In December, I became the proud parent of a new heat pump water heater.
Contractors showed up at my house and plugged it in. Presto, my gas bill fell by about 75 percent. A little free air conditioning came as a bonus.
The Navien NWP500 adorning my garage soaks up cheap, often-clean electricity during off-peak nighttime hours, while supplying copious hot water the rest of the day. It pulls heat and humidity from the air, leaving my garage cool and dry. The heat pump is about three to six times as efficient as any other technology on the market. Over its 15-year lifetime, I expect to net more than $2,000 in savings compared to its gas predecessor.
Right now, this piece of cutting-edge heating technology is a bit lonely: Just 2 to 3 percent of the U.S. water-heater market uses heat pumps (the rest is roughly split between gas and electric resistance), according to the Northwest Energy Efficiency Alliance (NEEA), a regional nonprofit.
But that will change. By 2029, new federal efficiency rules mean that all new electric water heaters over 35 gallons sold in the U.S. will employ the new technology (gas appliances are subject to different rules).
In theory, most Americans should save a bundle. In practice, as I discovered, it can take some work to ensure you see the savings.
I’m an extreme case here in California: natural gas prices are (relatively) low, while electricity and labor prices are sky-high. Yet piecing together local and federal rebates, as well as off-peak electricity rates and demand-response payments (allowing the utility to dial down consumption at peak times) should enable me to see a return on my investment in just two years. Many others are not so lucky.
Heat pump water heater technology has finally arrived. Here’s what I learned about what to buy, how to save and what to avoid before plugging in a new water heater.
Like your refrigerator or AC unit, what makes heat pump water heaters remarkably efficient is that they extract ambient heat from the air, said Jeff Harris of NEEA, which helps promote the technology. After early quality issues, today’s models come with industry-leading 10-year warranties, high customer satisfaction and the ability to heat water four to six times more efficiently than gas or electric resistance heaters. “It’s the equivalent of an LED lightbulb,” Harris said.
The average model sips just about 1,200 kWh per year, the equivalent output of two to three solar panels on your roof (or about $200 in average retail electric costs) in most of the United States. The technology is far less polluting than gas water heaters and furnaces in residential neighborhoods that emit dangerous levels of nitrogen dioxide (NO2) — linked to lung cancer, heart disease, diabetes, preterm birth and higher rates of childhood asthma — as well as 85 percent more planet-warming carbon dioxide.
U.S. sales hit 220,000 last year, Joseph Wachunas of the energy performance nonprofit New Buildings Institute estimates, with forecasts of several million annually by the end of the decade. That’s driving more choice: More than 300 Energy Star-certified models from 13 manufacturers are on the market, up from three in the early 2000s.
Two main types exist. First, there’s the standard vertical tank topped by a heat pump. These can be dropped in almost anywhere: a 120-volt model that plugs into a standard wall outlet (and avoids expensive electrical panel upgrades), while a 240V model offers higher efficiency but requires a higher voltage outlet (some give you the option to switch between them. The second option is a “split” system, with an outdoor compressor and an indoor tank. Most are hybrid: An electrical resistance element delivers hot water quickly if the heat pump can’t keep up.
For homeowners, the bigger question tends to be financial.
A heat pump water heater can pay for itself over time, but the math varies based on location and other factors. (Adrian Sanchez-Gonzalez/NEEA)
Installing a heat pump water heater still costs more: about $4,000 per appliance (roughly split between equipment and labor), according to the Advanced Water Heating Initiative (AWHI). That compares to about $2,500 for gas and $1,500 for electric resistance. (DIY installations are cheaper.)
In many parts of the United States, it’s hard to beat heat pump water heaters when you compare annual fuel costs (see caveats below): Utility bill savings range from about $100 to $500 per year compared to gas. It’s a fraction of the cost of resistance heating. For the average American family of four, according to the Environmental Protection Agency, that’s $5,600 in savings over the appliance’s lifetime (as well as a three-year payback period).
“This is a silver bullet technology to save money and energy,” said Wachunas, who has installed four on his properties since 2017. “The return on investment is usually one of the best of all the renewable energy efficient technologies.”
But that’s not the case not for everyone. The math gets more complicated in places with high electricity and low natural gas prices — like California. Finding a contractor, incentives and financing can be tricky.
In the Bay Area and Southern California, peak pricing and exorbitant electricity rates by investor-owned utilities can drive up the cost of electricity four to five times higher than equivalent energy from natural gas. That wipes out the roughly three- to fourfold efficiency advantage of heat pump water heaters.
That was the daunting math I was facing in San Francisco. Here’s how I overcame it.
First, I took my own advice after a gas furnace failure during a cold snap once forced me into an emergency replacement (up to 90 percent of water heater replacements are emergencies). This time, I planned ahead. I lined up a replacement model for my aging water heater.
Then I called for help. As much as I love DIY projects (and water heaters are eminently DIY-able), I have limited time to tinker in the garage, as a dad of two toddlers. So QuitCarbon, one of several one-stop shops for home electrification popping up across the country, did the work for me.
I uploaded a profile of my house, complete with pictures of the old water heater. Within a few days, the service had solicited and reviewed installer quotes for my property, estimated the costs and rebates, and ensured I picked the right model before a “QuitCarbon Coach” passed me off to my vetted contractor, Excalibur Water Heaters. In two more days, I had a new, WiFi-connected Navien whirring away in my garage, where my old gas appliance had been. Beyond a few software questions (Navien, please hire an app designer), it’s worked flawlessly ever since.
Is it saving me money? The total cost was $7,500 (high, but expected for a premium water heater at Bay Area rates with permits and a condensate pump). If that was the end of it, I would not have recouped my investment. My modest cost savings and higher standard electricity rate would never have paid back the premium.
But I had a few advantages: a $2,000 federal tax rebate (now expired) and a $1,200 credit over two years for enrolling in San Francisco’s demand-response programs (allowing the utility to dial down consumption at peak times). Being on PG&E’s electric vehicle plan allows me to “recharge” my hot water when rates are low, at night or during off-peak hours (using my tanks as a thermal battery), and we never run out of hot water. A mixing valve to keep water at 140 degrees Fahrenheit gives me an extra buffer.
Those conditions put my system in a position to pay for itself after two years. Rebates and tax credits were important (and annoying to fill out), shortening the payback from 15 years. But the key was lowering my electricity rates: My time-of-use plans mean I can take advantage of lower costs each day. Compared with gas, I’ll save more than $2,600 over the heater’s lifetime of 15 years (or maybe longer).
Your mileage may vary. While the equipment is the same across the country, each state and locality has its own set of prices, incentives, installers and other variables. Heat pump water heaters may even cost some homeowners more.
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How much will it cost?
Efficiency Maine has an excellent calculator that compares the fuel costs of different types of water heaters. You can find your energy prices on your utility bill (or pull your state’s average electricity rates here and average appliance consumption here). Compare the premium for your heat pump water heater to the alternative, and then look at fuel costs over its 10- to 15-year lifetime.
What considerations should I think about?
Do you have enough air flow? A 10-by-10-foot room is ideal, but many options (ducting, louver doors) mean they can work in small spaces and closets. Evaluate noise levels: Modern units operate at about 45 to 55 decibels, roughly the sound of a dishwasher. Confirm you have an electrical outlet (120 or 240 volts) and a drain to remove condensate water (or can run access to one). The EPA has a summary of considerations here.
What kind should I buy?
Consumer Reports has extensive evaluations, and Silicon Valley Clean Energy has a buying guide. For those who want a single appliance to heat their home and water, Harvest Thermal can save money. For tight spaces, try models from Eco-logical. Use Energy Star’s finder tool to identify certified products.
How do I find a contractor?
QuitCarbon, Rewiring America, Elephant Energy and Sealed are among those that can help you plan home electrification projects and find contractors. You can also search contractors verified by third parties: EPA-recognized contractor directories; HVAC industry associations such as NATE and ACCA; regional tools such as Switch is On (California, Washington state, New York and Colorado) and Hot Water Solutions (Pacific Northwest). Look for “dual-trade” contractors who are certified in both plumbing and electrical work.
Can I DIY this?
Nearly half of new heat pump water heater owners have done the install themselves. Check out the guides from NEEA and AWHI. The Plunjr site lets you get on-demand installation advice on your phone from qualified contractors, or can connect you with local installers.
How can I pay for it?
There are attractive loans, especially from credit unions or state-run green banks, for energy-efficiency projects. For rebates, check the Energy Star Rebate Finder and Switch is On incentives or just search for one near you.