Hot Water List

ECOSMART water heaters

11 basic models and 11 listed models.

Certified figures by basic model

ECOSMART basic models and their certified figures
Basic modelTypeUEFFlow at a 67°F rise (gal/min)Recovery efficiencyModel numbers
ECO 11 Electric tankless 0.921.292% ECO 11
ECO 8 Electric tankless 0.960.793% ECO 8
ECO POU 3.5 Electric tankless 0.950.398% ECO POU 3.5
ECO POU 6 Electric tankless 0.940.598% ECO POU 6
ECO18 Electric tankless 0.941.798% ECO18
ECO24 Electric tankless 0.932.498% ECO24
ECO27 Electric tankless 0.932.598% ECO27
ECO36 Electric tankless 0.943.598% ECO36
ECOS 12 Electric tankless 0.951.297% ECOS 12
ECOS 18 Electric tankless 0.961.898% ECOS 18
ECOS 27 Electric tankless 0.912.698% ECOS 27

A range means the models under one basic model differ. A dash means the model has no such figure.

Hot water out per unit of energy in, called UEF, reaches 0.96 among ECOSMART models. With 0.96, not all the energy used ended up in the water. Of this brand's basic models, 2 share the highest UEF, the ECO 8 among them.

This brand lists one type of water heater: electric tankless. Its tankless models reach their highest flow on the ECO36. In the test, that flow warms by 67°F at 3.5 gallons per minute.

Of the 117 brands on this site, 44 list more model numbers than ECOSMART. Each of 2 other brands shares at least one basic model number with this brand. The brand that lists the most of them is EEMAX, at 8.

Basic models shared with other brands

ECOSMART basic models also listed under another brand
BrandShared basic models
EEMAX8
Rheem8

Updated Oct 17, 2026 · Methodology