Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM)
Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) is a heat pump (hybrid electric) water heater from Rheem with a 45 gallon rated tank and a 67 gallon first-hour rating at a 3.5 UEF.
| Uniform Energy Factor (UEF) | 3.5 |
|---|---|
| Annual electricity use | 915 kWh/yr |
| Recovery efficiency | 400 % |
| Fuel | Electric |
|---|
| First-hour rating | 67 gal |
|---|---|
| Rated storage volume | 45 gal |
| Draw pattern | Medium |
| Heat pump type | 240 Volt Integrated HPWH |
|---|---|
| Refrigerant (GWP) | R-134a (GWP:1430) |
| Compressor low-temp cutoff | 37 °F |
| Input voltage | 240 |
|---|---|
| Max current draw | 21 A |
| Smart / connected capable | No |
|---|
| Height | 61.8 in |
|---|---|
| Diameter | 22.3 in |
| ENERGY STAR certified | Yes |
|---|
Who is the Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) for?
- Its 67 gallon first-hour rating suits a household of 3–4 people under DOE sizing guidance.
- Estimated running cost: about $156/year at the national average electricity rate (915 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.
Similar water heaters
- A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45 1-+AXST-50T 1) (UEF 3.52)
- A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45 1-+AXST-50TTTP 1) (UEF 3.52)
- A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45C 1-+AXST-50TC 1) (UEF 3.52)
- A. O. Smith Split System Heat Pump 40-Gallon (HPACO-45C 1-+AXST-50TCTTP 1) (UEF 3.52)
- American Split System Heat Pump 40-Gallon (MHPCO-45 1-+MXST-50T 1) (UEF 3.52)
- American Split System Heat Pump 40-Gallon (MHPCO-45 1-+MXST-50TTTP 1) (UEF 3.52)
Frequently asked questions
Is the Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) ENERGY STAR certified?
Yes, the Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) holds a current ENERGY STAR certification for water heating efficiency (UEF 3.5).
How much does the Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) cost to run per year?
About $156 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 H50 T2 RH310UM) need?
The Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) 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 H50 T2 RH310UM) a smart water heater?
No, the Rheem Heat Pump 40-Gallon (PRO H50 T2 RH310UM) is not connected-capable — it has no app connectivity or demand-response support.
Sources
- data.energystar.gov (retrieved 2026-07-17)