Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) is a heat pump (hybrid electric) water heater from Rheem with a 36 gallon rated tank and a 60 gallon first-hour rating at a 3.83 UEF — 859 kWh/yr certified use, 45 in tall.
Our take
A compact-format Rheem/Ruud configuration that pairs the platform's better compressor tune — 3.83 UEF, 79th percentile, about $146 a year, roughly $475 under a standard electric tank — with a 45-inch height and slim 16-inch diameter, the narrowest profile tier in the class. First-hour delivery of 60 gallons (2–3 people) remains the platform's known limit against a 64.5-gallon class median. Standard 240 V / 21 A electrics, R-134a, 37 °F cutoff, no connectivity. Two badges: Rheem and Ruud. The efficiency-per-cubic-inch here is quietly excellent.
Best for: Tight utility closets that still want top-quartile efficiency.
Trade-off: Modest first-hour capacity is the price of the small tank.
Efficiency
Uniform Energy Factor (UEF)
3.83
Annual electricity use
859 kWh/yr
Recovery efficiency
434 %
General
Fuel
Electric
Capacity
First-hour rating
60 gal
Rated storage volume
36 gal
Draw pattern
Medium
Heat pump
Heat pump type
240 Volt Integrated HPWH
Refrigerant (GWP)
R-134a (GWP:1430)
Compressor low-temp cutoff
37 °F
Installation
Input voltage
240
Max current draw
21 A
Smart features
Smart / connected capable
No
Dimensions
Height
45 in
Diameter
16 in
Certification
ENERGY STAR certified
Yes
Who is the Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) for?
Its 60 gallon first-hour rating suits a
household of 2–3 people under DOE sizing guidance.
Estimated running cost: about $146/year at the national
average electricity rate (859 kWh/yr certified use).
Needs a 240 V circuit; at 21 A max draw plan for a 30 A breaker (NEC 125% continuous-load rule).
The heat pump compressor operates down to 37 °F ambient — below that, backup
elements take over.
Also sold as
The Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) is certified hardware that Rheem and its partner brands
publish under 5 names. The same specifications apply to every
variant:
Is the Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) ENERGY STAR certified?
Yes, the Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.83).
How much does the Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) cost to run per year?
About $146 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 Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) need?
The Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) runs on a 240 V circuit drawing up to 21 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 Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) a smart water heater?
No, the Rheem Heat Pump 40-Gallon (PROPH40 T2 RH375-30) is not connected-capable — it has no app connectivity or demand-response support.
