ECOSMART ECOS 18

ECOSMART ECOS 18 is in the DOE listing as of Oct 19, 2026.

Electric tankless water heater
1 listed model

ENERGY STAR certification does not cover this type of water heater.

Its figures are also listed under Bradford White CTEH018********.

Flow at a 67°F rise: 1.8gallons per minute
UEF: 0.96Uniform energy factor

Flow where you live

The heater gives less flow when colder incoming water needs a bigger rise.

Cold water: Cold water must be at least 10°F colder than the hot water setting.
Flow estimate: The estimate uses the lowest certified flow among the listed models. It is about 1.7 gal/min at a 70°F rise.

Flow limits

The estimate excludes the flow needed to turn the heater on, heat lost in pipes, and installation.
Cold water from a well or long pipe run can differ from the temperature you enter.
Without a stated flow limit, estimates for warmer water may exceed the heater’s actual flow.

Certified figures by listed model

ECOSMART ECOS 18: certified figures by listed model
Model number	UEF	Flow at a 67°F rise (gal/min)	Recovery efficiency	Draw pattern
ECOS 18	0.96	1.8	98%	—

UEF is the uniform energy factor. A dash means the model has no such figure.

It heats 1.8 gallons per minute of water by 67°F in the test. The median electric tankless model heats 0.7 gallons per minute by 67°F. Among 337 electric tankless models, 33 give more flow at a 67°F rise.

In tests, 96% of the energy it uses ends up as hot water (UEF 0.96). While it heats water, 98% of the energy used goes into the water (its recovery efficiency).

All of its test figures are shared by 3 other basic models. Of those, one or more are under the Bradford White and Laars brands. For the full group, see the Bradford White CTEH018********.

Also listed as

They carry every figure in the table above.

Updated Oct 19, 2026 · Methodology

Not covered

Advertised figures. We have none on file for this model.