Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) is a heat pump (hybrid electric) water heater from Ruud 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.
Also sold as the Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM). This model is the same certified
hardware as the Rheem Heat Pump 40-Gallon (PRO H40 T2 RH310BM), 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)
3.5
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 Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) 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.
Is the Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) ENERGY STAR certified?
Yes, the Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.5).
How much does the Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) 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 Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) need?
The Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) 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 Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) a smart water heater?
No, the Ruud Heat Pump 40-Gallon (PRO H40 T2 RU310UM) is not connected-capable — it has no app connectivity or demand-response support.
