Every replacement below is a published model with verified specs. Savings calculated from EIA average energy prices.
Quick verdict
Fewest install changes
Rheem PROPH40 T2 RH400-30
no detected install changes
Lowest annual bill
Bradford White RE2HP50-1NCTT
$144/yr
Shortest unit
Bradford White RE2HP50-1NCTT
46.1" tall
Your HPTA-40-2 costs $156/yr. Every option below cuts that bill. See all heat pump models
What your current unit costs to operate
Annual$156/yr
10-year projection$1,560
Based on U.S. average energy rates (EIA). UEF 3.60.
Replacement options
Rheem PROPH40 T2 RH400-30
Heat PumpUEF 3.83 / ~$148/yr / 10-yr tank warranty
UEF 3.83 vs 3.60, shorter at 62.3 vs 66 inches, similar width
Annual savings$8/yr
10-year savings$80
Install changes
- 30A dedicated breaker needed
- 3.7" shorter than your current unit
Bradford White RE2HP50-1NCTT
Heat PumpUEF 3.89 / ~$144/yr / 10-yr tank warranty
Step up to 50-gal class, UEF 3.89, compact 46.1-inch height
Annual savings$12/yr
10-year savings$120
Install changes
- 19.9" shorter than your current unit
- 2.0" narrower than your current unit
Navien NWP500S050AUMB
Heat PumpUEF 3.85 / ~$145/yr / 10-yr tank warranty
Step up to 50-gal class, UEF 3.85, Wi-Fi and 45 dBA noise rated
Annual savings$11/yr
10-year savings$110
Install changes
- 30A dedicated breaker needed
- Needs condensate drain (your current unit does not)
- 3.0" shorter than your current unit
Side by side, the key differences.
Replacement comparison
| Spec | Your unit | PROPH40 T2 RH400-30 | RE2HP50-1NCTT | NWP500S050AUMB |
|---|---|---|---|---|
| UEF | 3.60 | 3.83 | 3.89 | 3.85 |
| Annual Cost | $156/yr | $148/yr | $144/yr | $145/yr |
| Annual Savings | $8/yr | $12/yr | $11/yr | |
| Height | 66.0" | 62.3" | 46.1" | 63" |
| Width | 20.0" | 20.3" | 18.0" | 21.7" |
| Warranty | 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