The Rinnai REHP50 is a 50 gallon hybrid heat pump water heater from a major water heater brand. It is ENERGY STAR certified with a 3.75 UEF and sells for about $1,800. It also comes in 65 and 80 gallon sizes on Amazon.
What You Need Before You Buy
- A licensed plumber and electrician. The listing says it runs on a 240V, 30A circuit. The plumber also connects the water lines, the relief valve and the condensate drain.
- Enough space and air. The U.S. Department of Energy says heat pump water heaters need a spot that stays between 40°F and 90°F year-round with at least 1,000 cubic feet of air around them, such as a basement, garage or large utility room.
- A condensate drain or pump nearby, because the heat pump makes water as it runs.
Installation, Climate and Shipping
This replaces a standard tank water heater, but it is not a DIY job. It needs a 240V/30A circuit, 3/4 inch water connections and a condensate drain, and many areas require a permit.
It pulls heat from the air around it, so it cools and dries the room it sits in. That is a bonus in a hot garage and a cost in a cold basement. In a space that gets too cold, it switches to its electric elements, which use much more power. It works best in warmer climates or in a conditioned space.
It is sold by eFaucets, a third-party seller, and goes by freight: the carrier contacts you to set a delivery date. It weighs about 212 pounds, so inspect the box for damage before you sign.
How It Compares
| Rinnai REHP50 | Senville 50 gal | |
|---|---|---|
| Typical price | $1,780–$1,820 | $1,580–$1,620 |
| Size | 50 gal, 73 gal first hour | 50 gal, 69 gal first hour |
| Efficiency | 3.75 UEF, ENERGY STAR | 3.75 UEF, ENERGY STAR |
| Installation | Pro, 240V/30A | Pro, 240V |
| Best for | Brand warranty, demand response | Lower price |
See my Senville 50 gal reviews.
Want to see other Heat Pump Water Heaters? Compare them side by side →
How I researched this: the specs above come from the seller’s Amazon listing (sold by eFaucets), not an independent test, plus a video review from Saroj Kumar. Prices, seller and delivery checked November 10, 2026.
Rinnai REHP50 50 Gallon Electric Heat Pump Water Heater
Rinnai REHP50 hybrid heat pump water heater: 3.75 UEF, 240V/30A install, space needs, freight delivery and warranty.
Product Brand: Rinnai
4.3
