Rheem ProTerra 50 Gal
#3 in 40–50 GallonFull review
A strong 240 V choice with Wi-Fi, widely stocked at Home Depot. GE Profile beats it on efficiency and noise.
Home Depot $1,699$1,699
3.6/5
A solid 240 V heater with leak protection included, sold at Lowe’s as the Signature 900 line.
- 50 galSize
- 3.80UEF
- 65 galFirst hour
- 240 VPower
- 37 °FRuns down to
- 10 yr tankWarranty
Check price at Lowe's$1,950
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Comes with a leak sensor and automatic shut-off valve
- Built-in Wi-Fi: set schedules and vacation mode from the A. O. Smith (iCOMM) app
- 10-year tank and parts warranty plus 1 year of labor
Cons
- Switches to the backup element when the room drops below 37 °F, so it saves little in a freezing garage
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | HPTS-50 |
|---|---|
| Ratings (ENERGY STAR) | |
| Size (nominal) | 50 gal |
| Tank volume (measured) | 46 gal |
| Uniform Energy Factor | 3.80 |
| First-hour rating | 65 gal |
| Draw pattern | Medium |
| Yearly energy use | 831 kWh |
| Heat pump cut-off (low) | 37 °F |
| Sound level | 45 dB(A) |
| ENERGY STAR ID | 2408851 |
| Installation | |
| Power | 240 V |
| Circuit | 30 A, 208/240 V |
| Backup element | 4,500 W |
| Operating air range | 37 to 120 °F |
| Minimum room size | 450 cu ft |
| Size | 63 in tall, 15 in across |
| Weight | 196 lb |
| Refrigerant | R-134a |
| Features | |
| Wi-Fi | Built in |
| App | A. O. Smith (iCOMM) |
| Demand response port (CTA-2045) | Yes |
| Leak detection | Yes |
| Modes | Hybrid, Heat Pump, Electric, Vacation |
| Warranty and models | |
| Warranty | 10 yr tank, 10 yr parts, 1 yr labor |
| Also sold as | American HPS10250H045DV, Lochinvar HPSA050KD, Reliance 10-50-DHPTS, State HPSX-50-DHPT |
| Released | 2022-06 |
Alternatives in this size
Rinnai REHP50
#4 in 40–50 GallonFull review
A Midea-built heater with Rinnai’s support network and one of the few listings on Amazon. Check the seller is a Rinnai-authorized dealer before buying.
Amazon $1,799 Lowe's $1,799$1,799
Bradford White AeroTherm 50 Gal
#6 in 40–50 GallonFull review
Bradford White’s second-generation hybrid, sold and installed through plumbers, with a 10-year tank and parts warranty and a port for utility demand-response programs.
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