Every replacement below is a published model with verified specs. Savings calculated from EIA average energy prices.
Quick verdict
Fewest install changes
A. O. Smith HPTA-40-2
no detected install changes
Lowest annual bill
Bradford White RE2HP50-1NCTT
$144/yr
Shortest unit
Bradford White RE2HP50-1NCTT
46.1" tall
Your PROPH40 T2 RH400-30 costs $148/yr. Every option below cuts that bill. See all heat pump models
What your current unit costs to operate
Annual$148/yr
10-year projection$1,480
Based on U.S. average energy rates (EIA). UEF 3.83.
Replacement options
A. O. Smith HPTA-40-2
Heat PumpUEF 3.60 / ~$156/yr / 10-yr tank warranty
UEF 3.60 vs 3.83, same 36-gal capacity, taller at 66 vs 62.3 inches
Operating cost is similar to your current unit ($8/yr more).
Install changes
- 3.7" taller 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$4/yr
10-year savings$40
Install changes
- 16.2" shorter than your current unit
- 2.3" 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$3/yr
10-year savings$30
Install changes
- Needs condensate drain (your current unit does not)
Side by side, the key differences.
Replacement comparison
| Spec | Your unit | HPTA-40-2 | RE2HP50-1NCTT | NWP500S050AUMB |
|---|---|---|---|---|
| UEF | 3.83 | 3.60 | 3.89 | 3.85 |
| Annual Cost | $148/yr | $156/yr | $144/yr | $145/yr |
| Annual Savings | $-8/yr | $4/yr | $3/yr | |
| Height | 62.3" | 66.0" | 46.1" | 63" |
| Width | 20.3" | 20.0" | 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