Water heating is one of the biggest energy loads in restaurants, hotels and apartment buildings, and with Washington’s Clean Buildings rules and Seattle BEPS, it’s getting a lot of attention. Here’s how heat pump water heating fits.
Two kinds of systems
- Unitary heat pump water heaters: tank-style units, typically under 120 gallons, that replace electric resistance tanks in restaurants, offices, retail and homes.
- Central systems: outdoor or mechanical-room heat pumps (including CO2 systems) feeding storage tanks for multifamily, hotels, senior living and other big hot-water users.
Sizing is everything
Heat pumps recover more slowly than gas burners, so storage and recovery have to be designed around peak demand: the breakfast rush, the lunch line, the 7 a.m. shower load. Swing tanks and recirculation design matter.
Placement and electrical
Unitary units pull heat from the surrounding air and need enough space and a condensate drain. Central systems need outdoor space or ventilation, and both need electrical capacity checked up front.
Rebates
As of October 2026: PSE pays $650 per qualifying commercial unit replacing electric resistance; Seattle City Light pays $0.36 per kWh saved for central systems over 120 gallons meeting NEEA’s Advanced Water Heating Specification (pre-approval required); and City Light’s small business program offers up to $4,000 off units under 120 gallons.
Heat pump water heater services · Rebates & incentives
Sources: PSE commercial HPWH rebate · PSE residential HPWH rebate · PSE business HVAC programs · Seattle City Light commercial retrofit incentives (6/24/2026) · City Light small business stacked rebates · WA Commerce Tier 2 incentive · WA Commerce CBPS incentives
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