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Heater Types

Heat Pump Water HeatersHigh-efficiency electric replacements and hybrid tanks.Condensing Tankless Water HeatersCondensing whole-home flow with venting constraints.Gas Tank Water HeatersStraight swaps when gas storage is still the fit.

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 NHP50Replacement candidates and projected operating-cost delta.Upgrade from NHP65Replacement candidates and projected operating-cost delta.Upgrade from NHP80Replacement candidates and projected operating-cost delta.Upgrade from NPE 210S2Replacement candidates and projected operating-cost delta.Upgrade from PROE50 T2 RH95Replacement candidates and projected operating-cost delta.HPTA 50 2 vs HPTA 80 2Side-by-side specs, efficiency, and fit differences.HPTS 50 2 vs NHP50Side-by-side specs, efficiency, and fit differences.NHP120 vs PROPH80 T2 RH400 30Side-by-side specs, efficiency, and fit differences.NPE 210S2 vs NPE 240S2Side-by-side specs, efficiency, and fit differences.

Guides & Data

California heat pump guideLocal rates, rebates, and operating costs.Colorado heat pump guideLocal rates, rebates, and operating costs.Massachusetts heat pump guideLocal rates, rebates, and operating costs.Oregon heat pump guideLocal rates, rebates, and operating costs.Washington heat pump guideLocal rates, rebates, and operating costs.DOE 2029 standardsWhat changes in 2029 and which product classes move first.

Brands

A.O. Smith Water HeatersPublished models, product lines, and brand coverage.Bradford White Water HeatersPublished models, product lines, and brand coverage.Navien Water HeatersPublished models, product lines, and brand coverage.Noritz Water HeatersPublished models, product lines, and brand coverage.Rheem Water HeatersPublished models, product lines, and brand coverage.Rinnai Water HeatersPublished models, product lines, and brand coverage.Takagi Water HeatersPublished models, product lines, and brand coverage.
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Comparison

NHP120 vs PROPH80 T2 RH400-30

Heat Pump vs Heat Pump for specs, cost, and install fit.
Both are heat pump water heaters. The PROPH80 T2 RH400-30 is more efficient (UEF 4.07 vs 3.38). The PROPH80 T2 RH400-30 saves $44/year to operate. All figures from published specs and EIA energy prices.

Performance

SpecNHP120
Noritz · Heat Pump		PROPH80 T2 RH400-30
Rheem · Heat Pump
UEF3.384.07Δ 0.69
Capacity109 galΔ 37 gal72 gal
First Hour Rating105 galΔ 18 gal87 gal
kW Input4.50 kWidentical
The PROPH80 T2 RH400-30 leads on efficiency. But does it fit? Sizing guide

Physical dimensions

DimensionNHP120PROPH80 T2 RH400-30
Height84.50"74.19"Δ 10.31"
Width30"24.25"Δ 5.75"
Depth—24.62"
Weight—261 lbs
The NHP120 is taller. Fit checked. Now the operating cost.

Operating cost

CostNHP120PROPH80 T2 RH400-30
Annual Operating Cost$253/yr$209/yrΔ $44/yr
10-Year Operating Cost$2,530$2,090Δ $440
Annual Energy1,467 kWh1,213 kWhΔ 254 kWh
10-year difference: $440 in favor of the PROPH80 T2 RH400-30, at current US average energy rates. Actual savings depend on local rates and usage patterns.

Costs vary by state. The NHP120 ranges from $162/yr (ND) to $611/yr (HI). The PROPH80 T2 RH400-30 ranges from $134/yr (ND) to $505/yr (HI).

$44/yr separates them. Install requirements determine the upfront gap. Installation accessories

Installation requirements

RequirementNHP120PROPH80 T2 RH400-30
Voltage240Videntical
Amperage23A21AΔ 2A
Breaker—30A
Same electrical requirements. Swapping between these units should not require electrical changes.

Warranty

CoverageNHP120PROPH80 T2 RH400-30
Tank10 yridentical
Parts10 yridentical
Labor1 yr—

Features

FeatureNHP120PROPH80 T2 RH400-30
Wi-Fi / Smart—Yes
RefrigerantR-134aidentical

Decision split

Pick this one if...

Noritz NHP120

  • You have high peak demand (105 gal FHR)

Pick this one if...

Rheem PROPH80 T2 RH400-30

  • Your ceiling or space is under 84.50"
  • Minimizing energy cost matters (saves $44/yr)
  • You want smart home / Wi-Fi control
  • Peak efficiency is the priority (UEF 4.07)

Neither if...

  • Your home only has 120V service and you cannot upgrade the panel
  • Your install space is under 700 sq ft of open air
Common accessories for this type of installation.

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
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Related
Sources. ENERGY STAR, manufacturer spec sheets, EIA average energy prices.Methodology