Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) 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 3.5 UEF — 879 kWh/yr certified use, 62.3 in tall.
Our take
Rheem's badge on the tall 36-gallon platform configuration: 62.3 inches, 20.3-inch diameter, 3.50 UEF at about $149 a year — below the 3.73 class median but still roughly $430 ahead of a standard electric tank. The 60-gallon first-hour rating serves 2–3 people; the class median is 64.5. Electrically standard at 240 V / 21 A on a 30 A breaker, with R-134a refrigerant and a 37 °F compressor cutoff. Ruud sells the identical certified unit. The FD400-series versions of this same platform post meaningfully better UEF for similar bulk.
Best for: Tall-tank swaps where the plumbing height is already set.
Trade-off: Its own platform-mates beat it on efficiency at the same size.
Efficiency
Uniform Energy Factor (UEF)
3.5
Annual electricity use
879 kWh/yr
Recovery efficiency
430 %
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
62.3 in
Diameter
20.3 in
Certification
ENERGY STAR certified
Yes
Who is the Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) for?
Its 60 gallon first-hour rating suits a
household of 2–3 people under DOE sizing guidance.
Estimated running cost: about $149/year at the national
average electricity rate (879 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 (PRO H40 T2 RH310BM) is certified hardware that Rheem and its partner brands
publish under 3 names. The same specifications apply to every
variant:
Is the Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) ENERGY STAR certified?
Yes, the Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.5).
How much does the Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) cost to run per year?
About $149 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 (PRO H40 T2 RH310BM) need?
The Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) 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 (PRO H40 T2 RH310BM) a smart water heater?
No, the Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM) is not connected-capable — it has no app connectivity or demand-response support.
