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120-volt integrated heat pump water heaters compared on official ENERGY STAR certified ratings. These models are listed at 120 volts, which is the usual reason people shop this group as a retrofit that can use an existing household circuit. Official uniform energy factor and first-hour rating on this list are often lower than on the 240-volt integrated models in the companion table. Certified storage volume can be lower than the marketed tank size. This table is limited to 120-volt integrated models. Split-system 120-volt listings such as Smart Solar SSG2-ES and the Eco-Logical OMNI-50HP1-1A appear on the ENERGY STAR list but are not ranked here, because they are certified as split systems rather than integrated tanks.
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Top pick
GP
GE Profile PF80S10FPY01
Score 9.9/10 · Check price
Why it wins: Official UEF 3.5, first-hour rating 94 gallons, 80 gallons certified storage, ENERGY STAR connected-capable. Highest official uniform energy factor in this comparison (3.5). Highest official first-hour rating in this comparison (94 gallons).
"Not listed" means the official ENERGY STAR, DOE or manufacturer record we used does not publish that figure. Prices show "Check price" until a retailer feed provides a current price.
Buying guide: how to choose the right 120-volt heat pump water heater
120-volt and 240-volt models are not interchangeable on paper
A 120-volt integrated heat pump water heater is listed at 120 volts on the ENERGY STAR record. That is why we keep this table separate from the 240-volt comparison. Official UEF and first-hour ratings in this group are often lower than on 240-volt models of a similar marketed size. Whether a given home can actually use a 120-volt unit on an existing circuit is a job for the installer and the manual, not for this dataset.
Read the official first-hour rating carefully
Some 120-volt 40- and 50-gallon-class records list first-hour ratings in the mid-40s to mid-50s. That is the certified figure we score. It can be lower than the brochure first-hour claim or than a 240-volt model with a similar tank size. Use the official number to compare models in this table, then decide whether that delivery is enough for the household.
Sister brands can share official ratings
Several Rheem, Ruud, Richmond and Friedrich 120-volt records, and several A. O. Smith, State, Lochinvar and Reliance records, publish the same certified storage volume, first-hour rating and UEF with different model numbers. We list the major retail names people search for, show the official brand and certified model number on each card, and do not infer extra hardware differences from the brand name alone.
Safety and installation
These units still use a sealed refrigerant system and a pressurized tank. Do not puncture the sealed system. Confirm that the circuit, receptacle, condensate drain, clearances and temperature-and-pressure relief piping match the maker’s instructions and local code. Set the temperature to reduce scald risk. This is not a substitute for the product manual or a licensed installer.
How this ranking is calculated
Score = weighted average of normalised specs, out of 10. Full method
Uniform energy factorOfficial ENERGY STAR uniform energy factor. Higher means more hot water delivered per unit of electricity. Missing values take the category minimum. Scale: 2.8 → 3.5.
40%
First-hour ratingOfficial ENERGY STAR first-hour rating in gallons. 120-volt models often certify at a lower first-hour rating than comparable 240-volt units. Missing values take the category minimum. Scale: 45 → 94 gallons.
36%
Certified storage volumeOfficial ENERGY STAR certified storage volume in gallons, which can differ from the marketed tank size. A larger tank is not automatically the right unit for a small household. Missing values take the category minimum. Scale: 36 → 82 gallons.
Can I assume a 120-volt model will plug into any household outlet?
No. ENERGY STAR lists these models at 120 volts, but it does not publish a complete circuit, receptacle or shared-load description for every unit in the fields we used. Follow the maker’s electrical instructions. We did not fetch those installer pages in this pass.
Why do several brands have the same official UEF and first-hour rating?
The ENERGY STAR records for some Rheem, Ruud, Richmond and Friedrich 120-volt models, and for some A. O. Smith, State, Lochinvar and Reliance models, list the same certified storage volume, first-hour rating and UEF. We treat each certified model number as its own product and do not collapse them into one row, because they are sold under different names. We also do not invent differences the official records do not show.
Why aren't Smart Solar or Eco-Logical OMNI models in this ranking?
The official ENERGY STAR records list those models as split-system heat pump water heaters, not as 120-volt integrated tanks. We kept this table to integrated 120-volt units. We also did not fetch a complete official specification table for every split-system catalog page in this pass.
Did you test these water heaters or list prices?
No. HeatPick ranks official ENERGY STAR certified ratings only. We do not test units, and we do not show prices or customer ratings.
Why do noise, warranty and plug type say Not listed?
Those figures are not in the ENERGY STAR certified-product fields we used, or they were blank on the record. We did not fetch a maker product page for these models in this pass, so we leave those extras as Not listed rather than copying them from a retailer listing.