Best Heat Pump Water Heaters (2026)

TL;DR

Top pick: SanCO2 split heat pump water heater — the Sanden SanCO2 has the highest score in Consumer Reports' lab tests of 15 heat pump water heaters (90, recommended), and Bob Vila's guide names it its best for cooler regions. Its heat pump sits outdoors or in another space, up to 50 feet from the 43-gallon indoor tank, and its maker, ECO₂ Systems, says it makes hot water even below -25°F. It is the expensive choice: Consumer Reports says it costs more than twice some alternatives, and Bob Vila calls it a "high-priced option for basic functionality" with no Wi-Fi. [src1, src7, src14]
Best value: A.O. Smith Signature 900 50-Gallon (HPS10-50H45DV) — recommended by Consumer Reports (75), and Bob Vila's best bang for the buck, which it says "offers excellent value for money". A.O. Smith rates it at 3.80 UEF with a 65-gallon first-hour rating, iCOMM app control and a Leak Shield automatic shut-off valve in the box. [src1, src7, src17]

How we rank. A named pick needs two independent reviews of the same model. Consumer Reports' lab score for a model counts as one; a guide that names only a product line does not count. Two models clear that bar. The SanCO2 leads because it pairs the top score in Consumer Reports' ratings with a second outlet's pick; the Signature 900 has the same two-outlet support with a lower Consumer Reports score (75) and is Bob Vila's value pick, so it is the value pick here. The Rheem ProTerra 50 Gal with LeakGuard, the card's old top pick, won a Good Housekeeping 2026 award, but Consumer Reports tested it and does not recommend it, so it is listed as an alternative. There is no budget pick: Plumbing Sniper's best budget, "A.O. Smith Signature 900", comes without a model number and with figures that do not match the HPS10-50H45DV, and GreenReviewsHub's, the GE GeoSpring [src6], is no longer made (GE, checked 2026-10-14) [src16]. [src1, src7, src4, src2, src5]

We rank by what the testers and reviewers found, not by stock or by where a link exists. The 30% federal 25C credit no longer applies to a heat pump water heater installed in 2026: the IRS allows it only for property placed in service before December 31, 2025, and Consumer Reports says the federal energy-upgrade credits were terminated. [src9, src1]

How the field was judged. Consumer Reports has tested 15 heat-pump water heaters in its labs, measuring how quickly each heats cold water and how much energy it uses, in heat-pump mode only. Good Housekeeping chose its 2026 Home Reno Award winners after six months of testing in its labs, in homes and on construction sites. Plumbing Sniper's author says he has installed all five units on his list. GreenReviewsHub, Smart Home Explorer and Bob Vila work from research (specifications, published data and owner feedback) rather than tests of their own. [src1, src4, src5, src6, src8, src7]

Why a heat pump. A heat pump water heater moves heat from the surrounding air into the tank instead of making it with resistance elements. Consumer Reports cites the Department of Energy: such models can be two to three times more energy-efficient than conventional electric water heaters, and Energy Star estimates a family of four can save about $550 a year with an Energy Star model. CR expects one to last 13 to 15 years, against 10 to 12 for a traditional tank. [src1]

Where the reviewers agree and differ. Consumer Reports recommends five of the models it tested: the Sanden SanCO2 (90), GE's Profile GeoSpring PH50S10BPY (84), the Navien NWP500-50 (76), and two A.O. Smith models, the ProLine XE Voltex HPTS-50 200 and the Signature 900 HPS10-50H45DV (75 each) [src1]. Bob Vila picks the SanCO2 for cooler regions and the A.O. Smith Signature as its best bang for the buck; its best overall is Rheem's Performance Platinum hybrid [src7]. Rheem's ProTerra fares better elsewhere: Good Housekeeping gave the 50-gallon LeakGuard model its 2026 award for a reliable water heater, although Consumer Reports tested that model and does not recommend it (66, 13th of 15) [src4, src2]. Plumbing Sniper names lines rather than model numbers: the Rheem ProTerra is its best overall, the A.O. Smith Signature 900 its best budget, the Bradford White AeroTherm its best for cold climates, the Rheem ProTerra 80-gallon its best for large homes and the GE GeoSpring 50-gallon its best compact [src5]. GreenReviewsHub's best overall is the Rheem ProTerra plug-in line and its best value the A.O. Smith Voltex line, neither with a model number; its best for cold climates is the Stiebel Eltron Accelera 300 and its best budget the GE GeoSpring [src6]. Good Housekeeping's other water-heater award went to A.O. Smith's Signature 900 with Hot Water Plus, named without a tank size or model number [src4]. Smart Home Explorer, which does no testing of its own, gives its top pick to an ACiQ hybrid and its highest value score to the Rinnai REHP80; neither is on this card because none of the other outlets we read reviews them [src8]. GE's Profile GeoSpring PH50S10BPY is no longer made (GE, checked 2026-10-14) [src16].

Best Overall: SanCO2 Split Heat Pump Water Heater — Check price

The split-system Sanden "came out on top" in Consumer Reports' ratings, with an overall score of 90 and CR's recommendation; CR says it heats water quickly, is highly efficient and comes with a 15-year warranty, and that its 43-gallon tank still has a first-hour rating of 69 gallons. Bob Vila names the SanCO2 its best for cooler regions. Its heat pump unit is separate from the tank and can sit outdoors or in another part of the house, up to 50 feet away; its maker, ECO₂ Systems, says it makes hot water even when the outdoor air is below -25°F. That matters because Consumer Reports says heat-pump water heaters work in a room with a minimum air temperature of 40°F, below which a hybrid falls back to its heating elements. The drawbacks are real: CR says it costs more than twice some alternatives, has no hybrid mode or electric elements, should be installed with a blending valve because it has no adjustable temperature set-point, and needs special precautions during a power outage in freezing weather; Bob Vila adds that it has no Wi-Fi and calls it a "high-priced option for basic functionality". [src1, src7, src14]

Best Value: A.O. Smith Signature 900 50-Gallon (HPS10-50H45DV) — Check price

Consumer Reports recommends this model, with an overall score of 75: it found it highly efficient and good at heating water quickly in heat-pump mode, with a hybrid mode, Wi-Fi, side and top plumbing connections and a 65-gallon first-hour rating, on a tall 68-inch tank. Bob Vila's best bang for the buck is "the A.O. Smith Signature", which "offers excellent value for money", and the figures it gives (a 65-gallon first-hour rating, 3.8 UEF, 45 decibels, energy savings of 76 percent) are the ones A.O. Smith publishes for the HPS10-50H45DV. A.O. Smith rates it at 3.80 UEF, with iCOMM app control, Leak Watch leak alerts, a Leak Shield automatic shut-off valve included, two 4,500-watt backup elements and a 10-year limited parts warranty. Two other outlets name a Signature 900 without identifying this model: Good Housekeeping's 2026 High-Efficiency award went to a Signature 900 "With Hot Water Plus", a feature A.O. Smith does not list for this model, and Plumbing Sniper's best budget Signature 900 has a 3.45 UEF and a 66-gallon first-hour rating, so we count neither here. [src1, src7, src17, src4, src5]

Good Housekeeping Award, Not Recommended by CR: Rheem ProTerra 50 Gal with LeakGuard (XE50T10HS45U1) — Check price

Good Housekeeping named the Rheem ProTerra its 2026 Home Reno Award winner for a reliable water heater, and its award links this 50-gallon model. It says the ProTerra "sells for about half as much as some competitors cost without sacrificing performance or features", and its experts cited Rheem's 10-year warranty as among the industry's most generous. Outside judge Marc Savatsky, who installed one on a project in Boston, liked monitoring energy use in the app, the forward-facing critical components and the zero-clearance install. Consumer Reports tested this exact model and does not recommend it: it scored 66, 13th of the 15 models CR has tested. CR also warns that in its most efficient heat-pump-only mode it may temporarily switch to hybrid mode if the tank temperature drops enough, and that this "can decrease its energy efficiency significantly, if it occurs frequently". Rheem rates it at 3.88 UEF, with LeakGuard (a 360° leak-detection cable and an automatic shut-off valve that, Rheem says, limits a leak to no more than 20 ounces of water), EcoNet Wi-Fi, an EcoPort (CTA-2045) demand-response port and a 37-145°F operating range. Plumbing Sniper's author says of the ProTerra line, without naming a model: "When a homeowner asks which heat pump water heater I would put in my own house, the answer is the Rheem ProTerra. Every time." [src4, src2, src10, src5]

CR-Recommended Alternative: A.O. Smith ProLine XE Voltex AL 50-Gallon (HPTS-50) — Check price

Consumer Reports tested this model as the HPTS-50 200 (A.O. Smith's current page lists the HPTS-50 210) and recommends it, with an overall score of 75: highly efficient and quite decent at heating water quickly in heat-pump mode, with side and top plumbing connections, Wi-Fi, and an alert and shut-off if it detects a leak. No second outlet we read reviews this model; GreenReviewsHub's best value is the A.O. Smith Voltex as a line, without a model number. A.O. Smith rates the 50-gallon at 3.88 UEF with a 65-gallon first-hour rating, iCOMM app control, and leak detection with an optional automatic water shut-off; it claims savings of up to $600 a year against a standard electric water heater. It also comes in 66 and 80 gallons. [src1, src12, src6]

Demand-Response Ready, 50 Gal: Rinnai REHP50 — Check price

Consumer Reports tested the REHP50 and does not recommend it, and Smart Home Explorer scores it 8.6/10, citing its zero-clearance install and a verified 844 kWh a year. Rinnai rates it at 3.75 UEF with a 73-gallon first-hour rating, and certifies the REHP series to CTA-2045 for utility demand-response programs, with a variable-speed fan and a heat-pump range down to 37°F ambient. [src1, src8, src13]

Heat-Pump-First 80 Gal: Stiebel Eltron Accelera 300 E — Check price

GreenReviewsHub's best for cold climates, citing an 80-gallon tank and a compressor that "operates efficiently down to 35 degrees F"; it lists a 2.83 UEF and a 78-gallon first-hour rating at $2,499-$2,999. Consumer Reports tested the Accelera 300E and does not recommend it. Stiebel Eltron calls its units "Heat Pump Water Heaters, not 'hybrids'", says the 80-gallon tank is exactly 80 gallons, and notes that in cooler climates the unit usually goes in the basement, where it also dehumidifies. [src6, src1, src15]

Not Sold: GE Profile GeoSpring 50 Gal (PH50S10BPY), no longer manufactured (GE, checked 2026-10-14) — GE's page

Consumer Reports tested the PH50S10BPY and recommends it (84, with the highest energy efficiency of the models it tested), and GreenReviewsHub still lists the GE GeoSpring as its best budget pick [src1, src6]. But GE's own page says "This model is no longer being manufactured" (GE, checked 2026-10-14) [src16]. It is on this card so you can identify it in older reviews; it is not a recommendation.

Head-to-Head Comparisons

SanCO2 vs A.O. Smith Signature 900 50-Gallon

Consumer Reports recommends both and scores the SanCO2 higher, 90 against 75. The SanCO2 is a split system: its heat pump sits outside or in another space, it has no electric elements or hybrid mode, and ECO₂ Systems says it works below -25°F; CR says it costs more than twice some alternatives. The Signature 900 is a one-piece 240V hybrid with two 4,500-watt backup elements, Wi-Fi and a leak shut-off valve, which A.O. Smith rates at 3.80 UEF and a 65-gallon first-hour rating; CR gives the SanCO2's 43-gallon tank a 69-gallon first-hour rating. Bob Vila picks the SanCO2 for cooler regions and the A.O. Smith for value. [src1, src14, src17, src7]

Pick the SanCO2 if: the tank's space gets cold, you want the heat pump outside the house, and its price is not the deciding factor.
Pick the Signature 900 if: the tank sits in a room that stays above 40°F and you want Wi-Fi, a leak shut-off valve and the value pick.

A.O. Smith Signature 900 (HPS10-50H45DV) vs A.O. Smith ProLine XE Voltex AL (HPTS-50)

Two A.O. Smith 50-gallon hybrids that Consumer Reports recommends with the same score, 75, finding both highly efficient in heat-pump mode, with side and top plumbing connections and Wi-Fi. A.O. Smith rates the Voltex AL at 3.88 UEF and the Signature 900 at 3.80, both with a 65-gallon first-hour rating. A.O. Smith includes the Signature 900's Leak Shield shut-off valve and lists the Voltex AL's automatic shut-off as optional. The Signature 900 also has Bob Vila's value pick behind it; no second outlet reviews the Voltex AL by model. [src1, src12, src17, src7]

Pick the Signature 900 if: you want the shut-off valve in the box and the model with two reviews behind it.
Pick the Voltex AL if: you want the higher rated UEF (3.88 against 3.80).

Rheem ProTerra 50 Gal with LeakGuard vs A.O. Smith Voltex AL 50-Gallon

Both makers rate their 50-gallon models at 3.88 UEF, and Consumer Reports tested both: it recommends the Voltex (as the HPTS-50 200, score 75) and does not recommend the Rheem (66). The Rheem ships with its leak sensor and automatic shut-off valve in the box, has an EcoPort (CTA-2045) demand-response port and a 37-145°F operating range; A.O. Smith gives the Voltex AL a 65-gallon first-hour rating, iCOMM app control and leak detection with an optional automatic shut-off. Good Housekeeping gave the Rheem a 2026 award. [src10, src12, src1, src2, src4]

Pick the Rheem ProTerra if: you want the shut-off valve included and a demand-response port.
Pick the Voltex AL if: you want the one of the two that Consumer Reports recommends.

Decision Logic

If you want one recommendation

→ SanCO2 if its price fits: the top of Consumer Reports' ratings (90) and Bob Vila's best for cooler regions. Otherwise the A.O. Smith Signature 900 50-Gallon (HPS10-50H45DV): recommended by Consumer Reports (75), Bob Vila's best bang for the buck, 3.80 UEF with a leak shut-off valve. [src1, src7, src17]

If you are replacing an electric tank and want a one-piece 240V hybrid

→ A.O. Smith Signature 900 50-Gallon (HPS10-50H45DV), which Consumer Reports notes requires 240-volt service. CR recommends A.O. Smith's ProLine XE Voltex AL (HPTS-50) with the same score, but no second outlet reviews that model. [src1, src7, src17, src12]

If there is no 240V circuit at the tank (replacing gas)

→ No 120V plug-in on this card has two reviews of the same model. Consumer Reports tested Rheem's 120V Performance Platinum ProTerra plug-in (XE50T10HM00U0) and does not recommend it: it scored 62, the lowest of the 15, and with no electric-resistance elements it always runs in heat-pump mode, without a hybrid's faster recovery. Rheem rates it at up to 3.46 UEF. CR notes that 120V models can plug into existing wiring but may take longer to heat a tank, and that switching from gas may need electrical upgrades that eat into the savings. [src3, src11, src1]

If the space around the tank gets colder than about 40°F

→ SanCO2, whose outdoor heat pump makes hot water below -25°F, according to ECO₂ Systems; Bob Vila picks it for cooler regions. Consumer Reports says heat-pump water heaters work in a room of at least 40°F, below which a hybrid uses its elements; Rheem rates the ProTerra 50 and Rinnai rates the REHP series down to 37°F. [src14, src7, src1, src10, src13]

If the household uses a lot of hot water at once

→ Compare first-hour ratings, which Consumer Reports points to (how much hot water a heater can supply in one hour, starting from a full tank). On this card the Stiebel Eltron Accelera 300 E lists 78 gallons (per GreenReviewsHub), the Rinnai REHP50 73 gallons (per Rinnai), and the SanCO2 69 gallons from its 43-gallon tank (per Consumer Reports). A.O. Smith also makes the Voltex AL in 66 and 80 gallons. [src1, src6, src13, src12]

If your utility runs a demand-response program

→ Rinnai REHP50, which Rinnai certifies to CTA-2045 and calls demand-response enabled; the Rheem ProTerra 50 Gal with LeakGuard also has a built-in EcoPort (CTA-2045) port. [src13, src10]

If you see a GE Profile GeoSpring for sale

→ GE says the PH50S10BPY is no longer being manufactured (checked 2026-10-14). It is on this card for identification only. [src16]

Default recommendation (unknown requirements)

→ SanCO2, the top of Consumer Reports' ratings, or the A.O. Smith Signature 900 50-Gallon (HPS10-50H45DV) as the value pick. [src1, src7]

• The federal credit is gone for 2026 installs: the IRS allows the 25C credit only for property placed in service before December 31, 2025; Consumer Reports, GreenReviewsHub and Smart Home Explorer all say a 2026 install gets no federal credit. [src9, src1, src6, src8]
• Leak shut-off on 50-gallon hybrids: A.O. Smith includes a Leak Shield shut-off valve with the Signature 900, Rheem ships the ProTerra 50 Gal with LeakGuard with a leak sensor and automatic shut-off valve, and A.O. Smith's Voltex AL has leak detection with an optional automatic shut-off. [src17, src10, src12]
• Demand-response ports: Rinnai certifies its REHP series to CTA-2045, and Rheem builds an EcoPort (CTA-2045) port into the ProTerra 50 Gal with LeakGuard. [src13, src10]
• 120V plug-ins exist, but the one CR tested scored lowest: Consumer Reports notes 120V models can plug into existing wiring and may take longer to heat a tank; it tested Rheem's XE50T10HM00U0 plug-in and does not recommend it. [src1, src3]
• Split CO2 systems for cold sites: Consumer Reports' top-rated model is the split Sanden SanCO2, whose maker says it heats water below -25°F outdoors. [src1, src14]
• GE's GeoSpring is discontinued: GE says its Profile GeoSpring PH50S10BPY is no longer being manufactured (checked 2026-10-14). [src16]

• Consumer Reports' caveats on the top pick: the SanCO2 lacks an adjustable temperature set-point, so CR says it should be installed with a blending valve, and because it circulates water between the tank and the heat pump unit, special precautions are needed during power outages in freezing weather. [src1]
• Rheem ProTerra with LeakGuard: Consumer Reports does not recommend it, and warns that in heat-pump-only mode the XE50T10HS45U1 may temporarily switch to hybrid mode when the tank cools, which "can decrease its energy efficiency significantly, if it occurs frequently". [src2]
• No federal tax credit for a 2026 install. The IRS page limits 25C to property placed in service before December 31, 2025. Some 2026 pages have not caught up: Plumbing Sniper's guide describes the credit as running through 2032, and A.O. Smith's Voltex AL page still prints a QM code for federal tax form 5695. State and utility rebates still apply where offered. [src9, src5, src12, src6, src1]
• Placement: Consumer Reports says these units need a room of at least 40°F, A.O. Smith specifies at least 450 cubic feet for its hybrids, and the condensate, up to a couple of gallons a day, must drain or be pumped away. [src1]
• Figures: UEF and first-hour ratings are the makers' own unless an outlet is named; Consumer Reports' tests run in heat-pump mode only, and its tested models ran from 50 to 76 gallons first-hour in hybrid mode. [src1]
• Cost: Consumer Reports' tested units ran from about $1,500 to more than $5,000, most $2,500 or less, before installation; a switch from gas may add electrical work. [src1]
• Not sold: the GE Profile GeoSpring PH50S10BPY is no longer manufactured, per GE (checked 2026-10-14). [src16]