Every model below is published with verified specs. Savings calculated from EIA average energy prices.
Quick verdict
Lowest annual bill
A. O. Smith HPTS-50-2
$143/yr
Most efficient
Bradford White RE2HP50-1NCTT
UEF 3.89
Shortest unit
Bradford White RE2HP50-1NCTT
46.1" tall
What a typical gas tank unit costs to operate
Annual$363/yr
10-year projection$3,630
Based on Rheem XG50T09HE40U0 (UEF 0.64). U.S. average energy rates (EIA).
Replacement options
A. O. Smith HPTS-50-2
Heat PumpUEF 3.80 / ~$143/yr / 10-yr tank warranty
Annual savings$220/yr
10-year savings$2,200
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
Bradford White RE2HP50-1NCTT
Heat PumpUEF 3.89 / ~$144/yr / 10-yr tank warranty
Annual savings$219/yr
10-year savings$2,190
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
Navien NWP500S050AUMB
Heat PumpUEF 3.85 / ~$145/yr / 10-yr tank warranty
Annual savings$218/yr
10-year savings$2,180
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
Rheem PROPH50 T2 RH400-30
Heat PumpUEF 3.88 / ~$146/yr / 10-yr tank warranty
Annual savings$217/yr
10-year savings$2,170
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
Rinnai REHP50BM
Heat PumpUEF 3.75 / ~$146/yr / 10-yr tank warranty
Annual savings$217/yr
10-year savings$2,170
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
A. O. Smith HPTA-50-2
Heat PumpUEF 3.68 / ~$152/yr / 10-yr tank warranty
Annual savings$211/yr
10-year savings$2,110
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
Noritz NHP50
Heat PumpUEF 3.46 / ~$162/yr / 10-yr tank warranty
Annual savings$201/yr
10-year savings$2,010
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
Bradford White RE2H50S
Heat PumpUEF 3.44 / ~$163/yr / 10-yr tank warranty
Annual savings$200/yr
10-year savings$2,000
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
- Heat pump needs condensate drain and adequate air volume
Rheem PROE50 T2 RH95
Electric TankUEF 0.93 / ~$607/yr / 6-yr tank warranty
Install changes
- Switching from gas to electric: requires 240V circuit, may need panel upgrade
Side-by-side comparison
| Spec | HPTS-50-2 | RE2HP50-1NCTT | NWP500S050AUMB | PROPH50 T2 RH400-30 | REHP50BM | HPTA-50-2 | NHP50 | RE2H50S | PROE50 T2 RH95 |
|---|---|---|---|---|---|---|---|---|---|
| UEF | 3.80 | 3.89 | 3.85 | 3.88 | 3.75 | 3.68 | 3.46 | 3.44 | 0.93 |
| Annual Cost | $143/yr | $144/yr | $145/yr | $146/yr | $146/yr | $152/yr | $162/yr | $163/yr | $607/yr |
| Annual Savings | $220/yr | $219/yr | $218/yr | $217/yr | $217/yr | $211/yr | $201/yr | $200/yr | $-244/yr |
| Height | 63" | 46.1" | 63" | 61.8" | 66.4" | 63.0" | 58.3" | 59.2" | 58.6" |
| Capacity | 46 gal | 45 gal | 44 gal | 45 gal | 46 gal | 46 gal | 47 gal | 45 gal | 47 gal |
| Warranty | 10 yr | 10 yr | 10 yr | 10 yr | 10 yr | 10 yr | 10 yr | 10 yr | 6 yr |
● Best value in each row.
Install considerations: gas tank to heat pump
Items your installer may need. Actual requirements depend on your existing setup, local code, and jurisdiction.
The federal tax credit of up to $2,000 under IRA Section 25C expired December 31, 2025. State and utility rebates may still apply.
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Sources. ENERGY STAR, manufacturer spec sheets, EIA average energy prices.Methodology