State guide

Heat Pump Water Heaters in Hawaii

Heat pumps are a strong investment in Hawaii. Estimated savings: $1459/yr vs a standard electric tank.

$1459/yr savings/1.6 yr payback/1 rebate program/39.8¢/kWh (128% above avg)

Utility rebates available now. IRA HEAR has not launched in Hawaii yet.

Running cost Rebates Best fits

Score breakdown: 82/100

Savings

55/55

Rebates

4/20

Climate

15/15

Install

8/10

RatingPlate Score. Based on EIA energy prices, ENERGY STAR data, state rebate programs, and permit research. Not a government rating or purchasing recommendation. FAQ

Hawaii electricity is 128% above the national average. Here's what that means for heat pump operating costs.

Running cost in Hawaii

At Hawaii's 39.8¢/kWh electricity rate, the most efficient heat pump water heater saves an estimated $1459 per year compared to a standard electric tank.

Hawaii electricity

39.8¢

per kWh (EIA, Jan 2026)

US average

17.4¢

per kWh

Best HP annual cost

$331

A. O. Smith HPTS-50-2

Electric resistance

$1791

~4,500 kWh/yr baseline

Gas tank baseline

$998

~200 therms/yr

Warmer inlet water (72°F annual average) means heat pump efficiency may exceed rated UEF in Hawaii. Less temperature rise needed, lower energy consumption.

Why Hawaii changes the call

01Energy cost

Hawaii electricity is 128% above the national average. That directly affects how much a heat pump saves compared to a standard electric tank.

02Climate impact

Incoming water averages 72°F annually and drops to about 70°F in winter. Colder water means the heat pump works harder and real efficiency is slightly lower than rated.

03Available incentives

State and utility rebates can significantly change the payback period. Check what's currently available before finalizing your decision.

Rebates in Hawaii

Hawaii has 1 rebate program as of March 2026.

The federal $2,000 tax credit (IRA Section 25C) expired December 31, 2025. State and utility rebates listed below may still be available. Verify current status at the links provided.

Hawaii Energy Heat Pump Water Heater Rebate

$500 (40-54 gal) / $700 (55-82 gal)

Who: Hawaii Energy (ratepayer-funded, administered by Leidos)
Eligibility: ENERGY STAR certified. 40-82 gallon tank. Instant in-store rebate at participating retailers. Cannot combine with other Hawaii Energy rebates. Available to residential electric utility ratepayers on Hawaii Island, Lanai, Maui, Molokai, and Oahu only (not Kauai).
https://hawaiienergy.com/for-homes/rebates/water-heating/

IRA HEAR Rebate (Point-of-Sale)

Not yet available in Hawaii as of March 2026. Up to $1,750 for income-qualified households when available.
Hawaii launched its IRA HEAR program in 2025.

Install requirements in Hawaii

Code basis: Based on UPC with state amendments

Seismic strapping

Required due to seismic zone classification.

Solar water heating

Hawaii requires solar water heating systems on new single-family residential construction (Act 204, effective 2010), with exemptions available if solar is not feasible.

Electrical

Dedicated 240V, 30A circuit (most models). Some newer 120V plug-in models exist but most residential units require 240V. Check the unit's nameplate for exact requirements.

Condensate drain

Heat pump water heaters produce condensate during operation. A condensate drain line to an approved location (floor drain, condensate pump, or exterior) is required.

Air space

Approximately 700 cubic feet of surrounding air (roughly a 10x10x7-foot room). The heat pump extracts heat from surrounding air. Insufficient air volume reduces efficiency and can cause the unit to underperform. Some manufacturers allow ducting to supplement air supply in smaller spaces.

Noise

Heat pump water heaters produce operational noise similar to a window AC unit (45-55 dB). Consider placement away from bedrooms.

Best fits for Hawaii

A smaller set of representative fits using Hawaii's 39.8¢/kWh rate. Curated to show different trade-offs instead of listing every published model on every state page. See the full heat pump lineup.

Lowest running cost

A. O. Smith

HPTS-50-2

Lowest annual bill at this state's electricity rate.

$331/yr 46 gal UEF 3.80 63" tall

Best efficiency

Bradford White

RE2HP65-1NCTT

Highest UEF in the published lineup.

$470/yr 65 gal UEF 4.20 44.6" tall

50-gallon sweet spot

Bradford White

RE2HP50-1NCTT

Common replacement size for 1 to 3 people.

$332/yr 45 gal UEF 3.89 46.1" tall

Large-household pick

Noritz

NHP120

Higher first-hour rating for heavier simultaneous demand.

$584/yr 109 gal UEF 3.38 84.5" tall

Tight-space pick

Bradford White

RE2HP80-1NCTT

Shortest cabinet among the published options.

$493/yr 75 gal UEF 4.00 51.1" tall

Common questions: Hawaii

Is a heat pump water heater worth it in Hawaii?

Yes. Hawaii scores A on RatingPlate's analysis, with estimated savings of $1459 per year compared to a standard electric tank. Payback on the higher upfront cost is roughly 1.6 years before rebates.

What rebates are available for heat pump water heaters in Hawaii?

Hawaii has 1 rebate program. The IRA HEAR program has not launched in Hawaii yet. Verify amounts and eligibility at the links in the rebates section above.

How much does a heat pump water heater cost to run in Hawaii?

At Hawaii's electricity rate of 39.8 cents per kWh, the most efficient heat pump water heater costs about $331/yr to run. A standard electric tank costs about $1790 per year.

Do I need a permit for a heat pump water heater in Hawaii?

Hawaii has 2 state-specific requirements: Seismic strapping, Solar water heating. Most jurisdictions also require a standard plumbing or mechanical permit. Check with your local building department.

What is the payback period for a heat pump water heater in Hawaii?

Without rebates, the payback period in Hawaii is approximately 1.6 years based on $1459 in annual savings versus a standard electric tank. With available rebates, payback could be significantly shorter.

Your next click

All heat pump modelsCompare specs across brands Back to homepageCompare other types or find a specific model Lowest cost: A. O. Smith$331/yr in Hawaii Sizing guideWhat size do you need? Replacement cost guideEquipment, labor, and hidden costs Heat pump vs gas tanklessCompare technologies across fuel types

Sources

Electricity and natural gas rates: U.S. Energy Information Administration, residential sector (EIA, Jan 2026).

Rebate data compiled from state energy offices, utility program pages, DSIRE, and ENERGY STAR. Rebate amounts and eligibility change frequently. Verify at listed program URLs.

Inlet water temperatures estimated from NOAA climate normals using the Burch-Christensen mains water temperature model (NREL).

Model specifications from ENERGY STAR certified product data and manufacturer spec sheets.

Page generated April 24, 2026. Data freshness varies by source.