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Plan Your Swap

Sizing guideCapacity, first-hour rating, and temperature-rise fit.Accessories hubInstall extras, code-adjacent parts, and paid-link accessory picks.Upgrade from 50 Gallon Electric TO HEAT PUMPUpgrade from 50 Gallon GAS TO HEAT PUMPUpgrade from 65 Gallon TO HEAT PUMPUpgrade from 80 Gallon TO HEAT PUMPUpgrade from GAS TO ElectricUpgrade from GAS TO TanklessHPTA 50 2 vs HPTA 80 2HPTS 50 2 vs NHP50NHP120 vs PROPH80 T2 RH400 30NPE 210S2 vs NPE 240S2NWP500S050AUMB vs NHP50PROPH40 T2 RH400 30 vs PROPH50 T2 RH400 30

Guides & Data

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Brands

A.O. Smith Water HeatersBradford White Water HeatersNavien Water HeatersNoritz Water HeatersRheem Water HeatersRinnai Water HeatersTakagi Water Heaters
Home / Replace / HPTA-66-2
Upgrade path

Upgrade from HPTA-66-2

4 verified replacements for the A. O. Smith HPTA-66-2.
Every replacement below is a published model with verified specs. Savings calculated from EIA average energy prices.

Quick verdict

Fewest install changes Rheem PROPH65 T2 RH400-30 no detected install changes
Lowest annual bill Bradford White RE2HP65-1NCTT $204/yr
Shortest unit Bradford White RE2HP65-1NCTT 44.6" tall
Your HPTA-66-2 costs $223/yr. Every option below cuts that bill. See all heat pump models

What your current unit costs to operate

Annual$223/yr
10-year projection$2,230

Based on U.S. average energy rates (EIA). UEF 3.84.

Replacement options

Bradford White RE2HP65-1NCTT

Heat Pump

UEF 4.20 / ~$204/yr / 10-yr tank warranty

UEF 4.20 vs 3.84, compact 44.6-inch height vs 61 inches

Annual savings$19/yr
10-year savings$190
Install changes
  • 16.4" shorter than your current unit
Full specs

Rheem PROPH65 T2 RH400-30

Heat Pump

UEF 4.05 / ~$204/yr / 10-yr tank warranty

UEF 4.05 vs 3.84, Wi-Fi included, 59-gal capacity vs 68 gal

Annual savings$19/yr
10-year savings$190
Install changes
  • 30A dedicated breaker needed
  • 3.2" taller than your current unit
Full specs · Compare side by side

Navien NWP500S065AUMB

Heat Pump

UEF 4.03 / ~$215/yr / 10-yr tank warranty

UEF 4.03 vs 3.84, Wi-Fi and 45 dBA noise rated

Annual savings$8/yr
10-year savings$80
Install changes
  • 30A dedicated breaker needed
  • Needs condensate drain (your current unit does not)
  • 2.0" taller than your current unit
  • 2.0" wider than your current unit
Full specs

Rinnai REHP65BM

Heat Pump

UEF 3.90 / ~$214/yr / 10-yr tank warranty

UEF 3.90 vs 3.84, Wi-Fi included, wider at 25.6 vs 23 inches

Annual savings$9/yr
10-year savings$90
Install changes
  • 30A dedicated breaker needed
  • 4.5" taller than your current unit
  • 2.6" wider than your current unit
Full specs
Side by side, the key differences.

Replacement comparison

SpecYour unitRE2HP65-1NCTTPROPH65 T2 RH400-30NWP500S065AUMBREHP65BM
UEF3.844.204.054.033.90
Annual Cost$223/yr$204/yr$204/yr$215/yr$214/yr
Annual Savings$19/yr$19/yr$8/yr$9/yr
Height61.0"44.6"64.2"63"65.5"
Width23.0"22.0"24.2"25"25.6"
Warranty10 yr10 yr10 yr10 yr10 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.

Thermal Expansion Tank Often required by code Check on Amazon (paid link)
Water Heater Drain Pan Often required by code Check on Amazon (paid link)
Earthquake Straps (Seismic Restraints) Often required by code Check on Amazon (paid link)
Full accessories list

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