TopTen USA

Ranking Criteria: The most efficient water heaters, ranked by Energy Factor, based on likely annual energy consumption. ENERGY STAR also uses this calculation.
Comparison Criteria:

How We Evaluate Our Medium Tankless Water Heaters

grid-item-top

Eternal GU145

Eternal
GU145(S)

grid-item-bottom

grid-item-top

Navien NR-180

Navien America
NP-180, NR-180

grid-item-bottom

grid-item-top

Navien NR-180

Navien America
NP-180A, NR-180A

grid-item-bottom

grid-item-top

Rinnai RC80HP

Rinnai
RC80HPe, RC80HPi

grid-item-bottom

grid-item-top

Quietside odw-120a

Quietside
ODW-120A

grid-item-bottom

Category Last Modified: September 15, 2011

Location search powered by Powered by Milo

Powered by Milo

Prices powered by Powered by Pricegrabber

Powered by Pricegrabber

Rebate search powered by Powered by Ecorebate

Powered by Ecorebate