Every replacement below is a published model with verified specs. Savings calculated from EIA average energy prices.
Quick verdict
Fewest install changes
Rheem PROPH50 T2 RH400-30
1 install change
Lowest annual bill
Bradford White RE2HP50-1NCTT
$144/yr
Shortest unit
Bradford White RE2HP50-1NCTT
46.1" tall
Your HPTA-50-2 costs $152/yr. Every option below cuts that bill. See all heat pump models
What your current unit costs to operate
Annual$152/yr
10-year projection$1,520
Based on U.S. average energy rates (EIA). UEF 3.68.
Replacement options
Rheem PROPH50 T2 RH400-30
Heat PumpUEF 3.88 / ~$146/yr / 10-yr tank warranty
UEF 3.88 vs 3.68, Wi-Fi included, wider at 22.25 vs 15 inches
Annual savings$6/yr
10-year savings$60
Install changes
- Needs condensate drain (your current unit does not)
- 7.2" wider than your current unit
Bradford White RE2HP50-1NCTT
Heat PumpUEF 3.89 / ~$144/yr / 10-yr tank warranty
UEF 3.89 vs 3.68, compact 46.1-inch height vs 63 inches
Annual savings$8/yr
10-year savings$80
Install changes
- 16.9" shorter than your current unit
- 3.0" wider than your current unit
Navien NWP500S050AUMB
Heat PumpUEF 3.85 / ~$145/yr / 10-yr tank warranty
UEF 3.85 vs 3.68, Wi-Fi and 45 dBA noise rated
Annual savings$7/yr
10-year savings$70
Install changes
- Needs condensate drain (your current unit does not)
- 6.7" wider than your current unit
Rinnai REHP50BM
Heat PumpUEF 3.75 / ~$146/yr / 10-yr tank warranty
UEF 3.75 vs 3.68, Wi-Fi included, wider at 21.7 vs 15 inches
Annual savings$6/yr
10-year savings$60
Install changes
- Needs condensate drain (your current unit does not)
- 3.4" taller than your current unit
- 6.7" wider than your current unit
Side by side, the key differences.
Replacement comparison
| Spec | Your unit | PROPH50 T2 RH400-30 | RE2HP50-1NCTT | NWP500S050AUMB | REHP50BM |
|---|---|---|---|---|---|
| UEF | 3.68 | 3.88 | 3.89 | 3.85 | 3.75 |
| Annual Cost | $152/yr | $146/yr | $144/yr | $145/yr | $146/yr |
| Annual Savings | $6/yr | $8/yr | $7/yr | $6/yr | |
| Height | 63.0" | 61.8" | 46.1" | 63" | 66.4" |
| Width | 15.0" | 22.2" | 18.0" | 21.7" | 21.7" |
| Warranty | 10 yr | 10 yr | 10 yr | 10 yr | 10 yr |
● Best value in each row. Your unit column shows the model being replaced.
Common install considerations for heat pump units
What is required depends on your existing installation, local code, and installer preference.
The federal tax credit of up to $2,000 under IRA Section 25C expired December 31, 2025. State and utility rebates may still apply.
Related
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Sources. ENERGY STAR, manufacturer spec sheets, EIA average energy prices.Methodology