Rinnai REHP50 50-Gallon (REHP50C) 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.
Also sold as the Rinnai REHP50 50-Gallon. This model is the same certified
hardware as the Rinnai REHP50 50-Gallon, published under a
different brand — full details, comparisons, and pricing live on that page. The
certified figures below are identical.
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 (REHP50C) 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.
Is the Rinnai REHP50 50-Gallon (REHP50C) ENERGY STAR certified?
Yes, the Rinnai REHP50 50-Gallon (REHP50C) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.75).
How much does the Rinnai REHP50 50-Gallon (REHP50C) 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 (REHP50C) need?
The Rinnai REHP50 50-Gallon (REHP50C) 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 (REHP50C) a smart water heater?
No, the Rinnai REHP50 50-Gallon (REHP50C) is not connected-capable — it has no app connectivity or demand-response support.
