Energy Star certified water heaters meet US EPA / DOE efficiency standards that qualify them for federal rebates, utility efficiency incentives, and state electrification programs. For 2026, Energy Star certification is the gateway to most rebates and tax credits — including the federal IRA 25C $2,000 heat pump credit, state utility rebates, and many local efficiency incentives.

What Energy Star certification means for water heaters

Energy Star certifies water heaters by UEF (Uniform Energy Factor) thresholds that vary by fuel and capacity:

Gas tank: UEF ≥ 0.64 (atmospheric) or ≥ 0.81 (condensing)
Electric tank: UEF ≥ 0.93 (resistance, large-tank) or ≥ 2.0 (heat pump — easily exceeded by modern units at 3.45+ UEF)
Gas tankless: UEF ≥ 0.93 condensing (effectively all modern condensing tankless qualify)
Electric tankless: UEF ≥ 0.92

Energy Star qualifying models in our catalog

Heat pump (always qualifies):

Condensing gas tankless (always qualifies):

Rheem RTGH-95DVLN (0.94 UEF)
Rinnai RU199iN (0.96 UEF)
Navien NPE-240A2 (0.97 UEF)

Condensing gas tank (Performance Platinum 0.84 UEF condensing models qualify):

Rheem Performance Platinum 29G Condensing
AO Smith Vertex 50G (0.90 UEF)

Energy Star rebates available

Federal IRA 25C: $2,000 tax credit for heat pump water heaters
State efficiency rebates: Mass Save ($1,200+), BayREN ($1,000+), NYSERDA ($700+), SMUD ($1,800+)
Utility rebates: ConEd, PG&E, National Grid, Eversource — typically $300–$1,200 for heat pump
Local rebates: municipal and county electrification programs in WA, OR, CA, MA, NY, VT, ME

Bottom line on Energy Star water heaters

For 2026 buyers planning a long ownership horizon, Energy Star certification is the gateway to substantial financial incentives. Heat pump water heaters and condensing gas tankless are the easy qualifying categories with the most generous incentive stacks. For tank installs, step up to Performance Platinum or condensing variants to qualify. See specific brand product pages above for individual UEF certifications.