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Everything you need to know — including one big (potential) drawback.
The humble water heater, like your fridge or septic tank, is the type of home technology that you only notice if and when it breaks. For most homeowners, that’s every 13 years. But if you’re on a mission to decarbonize your life, you might want to rethink your current set-up, and perhaps consider a makeover. Per the Department of Energy, water heating accounts for roughly 18% of the average household’s energy use, making it the second largest energy expense in any home.
Back in April, the DOE released new residential water heater standards that it says will save American households approximately $7.6 billion per year on their energy bills “while significantly cutting energy waste and harmful carbon pollution.” The standards will also, in effect, phase out electric resistance water heaters, which currently account for half the U.S. market, in favor of more energy-efficient heat pump water heaters by 2029. If any of that confuses you, read on. We’re breaking down everything you need to know about this oft-forgotten, basement-dwelling home technology, from the taxonomy of water heater types to tax credit and rebate tips to product recommendations.
Andy Meyer is a senior program manager at Efficiency Maine, an independent agency that implements energy efficiency programs in the state. His team is responsible for providing resources on heat pump water heaters to Maine residents, who buy one out of every 10 purchased in the U.S.
Ben Foster is vice president of operations at Barnett Plumbing & Water Heaters, a leading heat pump water heater contractor in California. He’s also developed loaner water heater programs supported by TECH Clean California, and notes that most contractors don’t have access to loaner programs:
Joseph Wachunas is a senior project manager at the New Buildings Institute, a nonprofit working to reduce emissions and deliver climate solutions through the built environment. At NBI, he heads up the Advanced Water Heating Initiative, which aims to decarbonize water heating through heat pump water heaters.
“Heat pump water heaters are simple to install — any plumber or handy person can do it — but plumbers may not be familiar with them. So if you talk with a plumber who has concerns, consider calling another plumber,” Meyer told me. “Again, Mainers have installed over 70,000 in the last 12 years. They are no longer new.”
A heat pump water heater is made up of a compressor, storage tank, condenser, evaporator coil, fan, backup heating elements, and refrigerant. The compressor, located in the upper compartment of the water heater, uses refrigerant to heat the water in the storage tank (via the condenser, which acts as a heat exchanger). The evaporator coil and fan work to change refrigerant from liquid back to gas after the water has been heated. The backup electric heating elements kick in only in periods of high demand to ensure consistent hot water supply.
A common misconception about heat pumps in general is that they don’t work in colder climates. This is not at all the case — half of electric water heaters in Maine, for instance, are now heat pumps. As long as they are installed indoors and in an area where pipes won’t freeze (typically, a basement), heat pump water heaters work throughout the year in all climates, according to Meyer and Wachunas. The rule of thumb, per the DOE, is to install your heat pump water heater in locations that remain in the 40 degree to 90 degree Fahrenheit range year-round.
Per the DOE, replacing your standard electric water heater with a heat pump water heater can save you up to 10% on your electricity bill, reducing your water heating energy consumption and costs by up to 70%.
The number one mistake homeowners make when it comes to their water heaters is waiting until they’re broken to replace them. This severely limits your options for new water heaters — as Foster notes, no one “wants to go days without hot water, let alone weeks,” and it can take weeks or even months to fit your home for a heat pump water heater. (We’ll get into why a bit later.)
“A lot of contractors, if you want a heat pump and you have a leaking water heater that needs to be replaced today, they're just going to convince you to go with gas,” Foster said.
Some contractors have loaner water heater programs, so you can temporarily use a gas heater in an emergency situation, but these programs are few and far between. If you’ve had your water heater for 10 years or more — even if it’s working just fine — it might be time to think about replacing it. If you do, you’ll need to consider a few things about your home and lifestyle, especially if you’re considering a heat pump water heater:
Heat pump water heaters require a significant amount of space. Per Pacific Northwest National Laboratory, heat pump water heaters can require more than 6 feet of height clearance to account for their air filters, as well as a 3-foot diameter space to provide clearance for the drain pan and other connections. Additionally, the heat pump water heater should be positioned so the exhaust outlet is at least 8 inches away from a wall, door, or ceiling.
Also, since heat pump water heaters work by drawing heat from the surrounding air, they require 700 cubic feet of unenclosed space surrounding the water heater location. While it is possible to install a heat pump water heater in a location with insufficient air volume (for instance, by installing the water heater with a door equipped with top and bottom grills), this would require extra work from your contractor. Taking all these measurements into account, this basically means that a heat pump water heater requires a 10-foot by 9-foot room with an 8-foot-tall ceiling.
Heat pump water heaters also require monthly and yearly service, Meyer told me. You should change the water filter every two to six months, and clear the condensate lines to ensure your unit doesn’t get clogged with mold or bacteria. Additionally, if your unit is a hybrid, you’ll have to keep an eye on its anode rod, which can become corroded over time and lead to heating issues. You’ll have to flush your heat pump water heater annually to avoid corrosion.
If you’re going to DIY it, understanding your household’s water needs is key to sizing and installing a new heat pump water heater. First, determine your house’s peak hour demand (the maximum amount of water your house uses in one hour per day) using this worksheet from the DOE. You can then use that number (measured in gallons) to determine what size heat water heater to buy — look at the heater’s first hour rating, a.k.a. the amount of hot water the heater can supply per hour, starting with a tank full of hot water. You’ll want your heater’s first hour rating to be equal to (or ideally, higher than) your peak hour demand.
Though you should use the worksheet to determine your unique peak hour demand, a general rule is that households of one to two people should use a 50-gallon water heater, while households of three or more people should use a 65- to 80-gallon tank. The average family uses 50 gallons of hot water per day, Wachunas explained. “So even if you have lots of showers in the morning, your heat pump in two to four hours will heat that water back up and you have plenty of extra supply.”
If you’re between two sizes of heat pump water heaters, always upsize, Foster said. This ensures that the heat pump is the primary source of heat, as opposed to the much less efficient backup electric mechanisms. In other words, it’s far more efficient (and less expensive!) for a larger heat pump water heater to heat a few extra gallons of water using the heat pump than it is for a smaller heat pump water heater to have to use its electric elements to keep up with excess demand.
Since many heat pump water heaters have certain voltage requirements, you may have to upgrade your electrical panel for 240-volt hardwired service. The cost and time involved in having your service upgraded can vary and depends on whether the power lines coming into your house are above ground. If they’re underground, Foster explained, a contractor will have to excavate and run new cables, which can take over a year. The best way to determine if you’ll need to upgrade your service is to have a trusted contractor do an assessment on your home. (This is also why it’s essential to plan in advance.)
Basements are always the best places for heat pump water heaters, regardless of climate. Other common locations for installation include garages, interior rooms, and rooms outside the thermal envelope, like attached sheds and utility rooms. The garage does not have to be insulated if outdoor temperatures are usually above 50°F, but if temperatures dip below freezing and the garage is uninsulated, it’d be best to consider another location. Interior rooms, like laundry or IT rooms, are a great choice because a heat pump water heater can utilize any waste heat generated by the equipment in the room. Finally, rooms outside the thermal envelope, like attached sheds, can be even more efficient than interior spaces in hot or warm climates because of the excess hot air.
Feeling ready to go shopping? Here’s everything you need to know about the buying and installation process.
This plug-in model caused quite a stir when it came out two years ago, and for good reason. Its low voltage allows it to be plugged into a standard outlet, making it a great fit for smaller homes with fewer residents, or anyone in need of a quick fix. (This is also a relatively foolproof choice for DIYers because of the quick and easy installation process.) For those wanting a model with a bit more flexibility but still an easy install, there’s the A.O. Smith Signature 900Plug-in Hybrid, which is more expensive but has the added benefit of back-up electric resistance elements that help with higher hot water demand. Alternatively, you can go for the 120-Volt Rheem ProTerra Plug-in Water Heater with HydroBoost, which utilizes a mixing valve for maximum hot water output.
If app functionality is especially important to you, Rheem’s ProTerra line might be particularly appealing. The EcoNet app allows users to monitor the hot water heater from their phone, with status updates on potential leaks as well as compressor health, hot water availability and the unit’s set water temperature.
Another solid choice for larger families, for roughly the same price, is A.O. Smith’s Signature 900 80-Gal.For further durability, consider Bradford White’s Aerotherm Series water heaters, which can only be purchased through a qualified contractor, but are frequently praised for their resilience and anti-microbial technology.
Split-system heat pump water heaters are the answer for truly huge houses, where the heat pump itself is outside while the storage tank remains inside. “You can chain together as many heat pump units as you want with as many storage tanks as you want,” Foster said. “So you can create as big a system as you want.” While split-system heat pump water heaters are much less widely-available in the U.S. than they are in Asia and Europe, you can purchase this one online. SANCO is also shipping a new fifth generation unit soon, Quit Carbon advises, which may prove more cost-effective and will qualify for more rebates in California.
The quietest HPWH on the market, at 45 decibels, is made by A.O. Smith, according to Foster. It’s available in 50, 65, and 80 gallon sizes, so it can accommodate a variety of household types. Another quiet option is LG’s Inverter Heat Pump Water Heater, though LG is much newer to the heat pump water heater game than Rheem and A.O. Smith, so it may be more difficult to find qualified contractors.
Three more expert contractors I spoke with — Nate Adams, a longtime HVAC insulation and sealing contractor in West Virginia who specializes in electrification retrofits for homeowners; John Semmelhack, an HVAC consultant and the owner of Think Little, a building science consulting firm specializing in mechanical system design for passive house and net-zero energy homes; and Tim Portman, the owner of Portman Mechanical, specializing in electrification, heating and cooling, and home performance — had concerns about heat pump water heater installations.
Adams said heaters he’s installed have had a 50% failure rate, while Portman and Semmelhack cite a 60% failure rate. These issues have seemingly cropped up after 2018 and are almost entirely occurring with A.O. Smith and Rheem’s fifth generation of water heater models; older generations performed and continue to perform much better. “All my installs from 2014-2018 are still running to my knowledge,” says Adams. “Which is a big part of my frustration— we had this figured out already.”
The specific causes of these failures vary, spanning from tanks bursting to heat pumps losing charge, according to Adams. Semmelhack and Portman, meanwhile, pointed mainly to refrigerant leaks and compressor issues. (A.O. Smith and Rheem did not respond to requests for comment.) “All of the failures are happening inside the first year of operation,” noted Semmelhack. “So it's happening pretty quick, which makes us think that it's a factory problem and not an environmental problem inside the household.”
Semmelhack and Portman are hopeful about Cala’s new heat pump water heaters, which use an AI-powered control system to forecast hot water demand and heat the water in the tank accordingly with a heat pump. They’re aiming to start shipping those units in 2025, and you can preorder and learn more here.
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Republicans are taking over some of the most powerful institutions for crafting climate policy on Earth.
When Republicans flipped the Senate, they took the keys to three critical energy and climate-focused committees.
These are among the most powerful institutions for crafting climate policy on Earth. The Senate plays the role of gatekeeper for important legislation, as it requires a supermajority to overcome the filibuster. Hence, it’s both where many promising climate bills from the House go to die, as well as where key administrators such as the heads of the Department of Energy and the Environmental Protection Agency are vetted and confirmed.
We’ll have to wait a bit for the Senate’s new committee chairs to be officially confirmed. But Jeff Navin, co-founder at the climate change-focused government affairs firm Boundary Stone Partners, told me that since selections are usually based on seniority, in many cases it’s already clear which Republicans are poised to lead under Trump and which Democrats will assume second-in-command (known as the ranking member). Here’s what we know so far.
This committee has been famously led by Joe Manchin, the former Democrat, now Independent senator from West Virginia, who will retire at the end of this legislative session. Energy and Natural Resources has a history of bipartisan collaboration and was integral in developing many of the key provisions in the Inflation Reduction Act — and could thus play a key role in dismantling them. Overall, the committee oversees the DOE, the Department of the Interior, the U.S. Forest Service, and the Federal Energy Regulatory Commission, so it’s no small deal that its next chairman will likely be Mike Lee, the ultra-conservative Republican from Utah. That’s assuming that the committee's current ranking member, John Barrasso of Wyoming, wins his bid for Republican Senate whip, which seems very likely.
Lee opposes federal ownership of public lands, setting himself up to butt heads with Martin Heinrich, the Democrat from New Mexico and likely the committee’s next ranking member. Lee has also said that solving climate change is simply a matter of having more babies, as “problems of human imagination are not solved by more laws, they’re solved by more humans.” As Navin told me, “We've had this kind of safe space where so-called quiet climate policy could get done in the margins. And it’s not clear that that's going to continue to exist with the new leadership.”
This committee is currently chaired by Democrat Tom Carper of Delaware, who is retiring after this term. Poised to take over is the Republican’s current ranking member, Shelley Moore Capito of West Virginia. She’s been a strong advocate for continued reliance on coal and natural gas power plants, while also carving out areas of bipartisan consensus on issues such as nuclear energy, carbon capture, and infrastructure projects during her tenure on the committee. The job of the Environment and Public Works committee is in the name: It oversees the EPA, writes key pieces of environmental legislation such as the Clean Air Act and Clean Water Act, and supervises public infrastructure projects such as highways, bridges, and dams.
Navin told me that many believe the new Democratic ranking member will be Sheldon Whitehouse of Rhode Island, although to do so, he would have to step down from his perch at the Senate Budget Committee, where he is currently chair. A tireless advocate of the climate cause, Whitehouse has worked on the Environment and Public Works committee for over 15 years, and lately seems to have had a relatively productive working relationship with Capito.
This subcommittee falls under the broader Senate Appropriations Committee and is responsible for allocating funding for the DOE, various water development projects, and various other agencies such as the Nuclear Regulatory Commission.
California’s Dianne Feinstein used to chair this subcommittee until her death last year, when Democrat Patty Murray of Washington took over. Navin told me that the subcommittee’s next leader will depend on how the game of “musical chairs” in the larger Appropriations Committee shakes out. Depending on their subcommittee preferences, the chair could end up being John Kennedy of Louisiana, outgoing Senate Minority Leader Mitch McConnell of Kentucky, or Lisa Murkowski of Alaska. It’s likewise hard to say who the top Democrat will be.
Inside a wild race sparked by a solar farm in Knox County, Ohio.
The most important climate election you’ve never heard of? Your local county commissioner.
County commissioners are usually the most powerful governing individuals in a county government. As officials closer to community-level planning than, say a sitting senator, commissioners wind up on the frontlines of grassroots opposition to renewables. And increasingly, property owners that may be personally impacted by solar or wind farms in their backyards are gunning for county commissioner positions on explicitly anti-development platforms.
Take the case of newly-elected Ohio county commissioner – and Christian social media lifestyle influencer – Drenda Keesee.
In March, Keesee beat fellow Republican Thom Collier in a primary to become a GOP nominee for a commissioner seat in Knox County, Ohio. Knox, a ruby red area with very few Democratic voters, is one of the hottest battlegrounds in the war over solar energy on prime farmland and one of the riskiest counties in the country for developers, according to Heatmap Pro’s database. But Collier had expressed openness to allowing new solar to be built on a case-by-case basis, while Keesee ran on a platform focused almost exclusively on blocking solar development. Collier ultimately placed third in the primary, behind Keesee and another anti-solar candidate placing second.
Fighting solar is a personal issue for Keesee (pronounced keh-see, like “messy”). She has aggressively fought Frasier Solar – a 120 megawatt solar project in the country proposed by Open Road Renewables – getting involved in organizing against the project and regularly attending state regulator hearings. Filings she submitted to the Ohio Power Siting Board state she owns a property at least somewhat adjacent to the proposed solar farm. Based on the sheer volume of those filings this is clearly her passion project – alongside preaching and comparing gay people to Hitler.
Yesterday I spoke to Collier who told me the Frasier Solar project motivated Keesee’s candidacy. He remembered first encountering her at a community meeting – “she verbally accosted me” – and that she “decided she’d run against me because [the solar farm] was going to be next to her house.” In his view, he lost the race because excitement and money combined to produce high anti-solar turnout in a kind of local government primary that ordinarily has low campaign spending and is quite quiet. Some of that funding and activity has been well documented.
“She did it right: tons of ground troops, people from her church, people she’s close with went door-to-door, and they put out lots of propaganda. She got them stirred up that we were going to take all the farmland and turn it into solar,” he said.
Collier’s takeaway from the race was that local commissioner races are particularly vulnerable to the sorts of disinformation, campaign spending and political attacks we’re used to seeing more often in races for higher offices at the state and federal level.
“Unfortunately it has become this,” he bemoaned, “fueled by people who have little to no knowledge of what we do or how we do it. If you stir up enough stuff and you cry out loud enough and put up enough misinformation, people will start to believe it.”
Races like these are happening elsewhere in Ohio and in other states like Georgia, where opposition to a battery plant mobilized Republican primaries. As the climate world digests the federal election results and tries to work backwards from there, perhaps at least some attention will refocus on local campaigns like these.
And more of the week’s most important conflicts around renewable energy.
1. Madison County, Missouri – A giant battery material recycling plant owned by Critical Mineral Recovery exploded and became engulfed in flames last week, creating a potential Vineyard Wind-level PR headache for energy storage.
2. Benton County, Washington State – Governor Jay Inslee finally got state approvals finished for Scout Clean Energy’s massive Horse Heaven wind farm after a prolonged battle over project siting, cultural heritage management, and bird habitat.
3. Fulton County, Georgia – A large NextEra battery storage facility outside of Atlanta is facing a lawsuit that commingles usual conflicts over building these properties with environmental justice concerns, I’ve learned.
Here’s what else I’m watching…
In Colorado, Weld County commissioners approved part of one of the largest solar projects in the nation proposed by Balanced Rock Power.
In New Mexico, a large solar farm in Sandoval County proposed by a subsidiary of U.S. PCR Investments on land typically used for cattle is facing consternation.
In Pennsylvania, Schuylkill County commissioners are thinking about new solar zoning restrictions.
In Kentucky, Lost City Renewables is still wrestling with local concerns surrounding a 1,300-acre solar farm in rural Muhlenberg County.
In Minnesota, Ranger Power’s Gopher State solar project is starting to go through the public hearing process.
In Texas, Trina Solar – a company media reports have linked to China – announced it sold a large battery plant the day after the election. It was acquired by Norwegian company FREYR.