Rinnai REHP50 50-Gallon is a heat pump (hybrid electric) water heater from Rinnai with a 46 gallon rated tank and a 73 gallon first-hour rating at a 3.75 UEF — 844 kWh/yr certified use, 66.4 in tall.
Efficiency
Uniform Energy Factor (UEF)
3.75
Annual electricity use
844 kWh/yr
Recovery efficiency
465 %
General
Fuel
Electric
Capacity
First-hour rating
73 gal
Rated storage volume
46 gal
Draw pattern
Medium
Heat pump
Heat pump type
240 Volt Integrated HPWH
Refrigerant (GWP)
R-134a (GWP:1430)
Compressor low-temp cutoff
37.4 °F
Installation
Input voltage
240
Max current draw
24 A
Smart features
Smart / connected capable
No
Dimensions
Height
66.4 in
Diameter
21.7 in
Certification
ENERGY STAR certified
Yes
Who is the Rinnai REHP50 50-Gallon for?
Its 73 gallon first-hour rating suits a
household of 3–4 people under DOE sizing guidance.
Estimated running cost: about $143/year at the national
average electricity rate (844 kWh/yr certified use).
Needs a 240 V circuit; at 24 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
The heat pump compressor operates down to 37.4 °F ambient — below that, backup
elements take over.
The Rinnai REHP50 50-Gallon is certified hardware that Rinnai and its partner brands
publish under 3 names. The same specifications apply to every
variant:
Is the Rinnai REHP50 50-Gallon ENERGY STAR certified?
Yes, the Rinnai REHP50 50-Gallon holds a current ENERGY STAR certification for water heating efficiency (UEF 3.75).
How much does the Rinnai REHP50 50-Gallon cost to run per year?
About $143 per year at national average energy rates, based on its certified annual energy use under the DOE test draw pattern. Your rate and usage change this figure.
What electrical circuit does the Rinnai REHP50 50-Gallon need?
The Rinnai REHP50 50-Gallon runs on a 240 V circuit drawing up to 24 A; per the NEC 125% continuous-load rule plan for at least a 30 A breaker (check the installation manual for the required circuit).
Is the Rinnai REHP50 50-Gallon a smart water heater?
No, the Rinnai REHP50 50-Gallon is not connected-capable — it has no app connectivity or demand-response support.
