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RELIANCE WATER HEATERS R4LA-220E 1**

RELIANCE WATER HEATERS R4LA-220E 1** 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 A. O. Smith R4LA-220E 1**.

Flow at a 67°F rise
2.2gallons per minuteCertified
Advertised flow
2.2gallons per minuteRELIANCE WATER HEATERS, at a 67°F rise
UEF
0.92Uniform energy factor

Flow where you live

A bigger rise from colder incoming water leaves the heater with less flow.

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 2.1 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.

Advertised and certified figures

RELIANCE WATER HEATERS R4LA-220E 1**: advertised and certified
RELIANCE WATER HEATERS R4LA-220E 1**: advertised and certified UEF: advertised 0.92, certified 0.92. Flow: advertised 2.2 gal/min, certified 2.2 gal/min (advertised at a 67°F rise, certified at a 67°F rise). UEF Advertised 0.92 Certified 0.92 Flow · advertised at a 67°F rise, certified at a 67°F rise Advertised 2.2 gal/min Certified 2.2 gal/min
FigureAdvertisedCertifiedAdvertiserRead
UEF 0.92 0.92 RELIANCE WATER HEATERS Read Oct 4, 2026
Flow 2.2 gal/min at a 67°F rise 2.2 gal/min at a 67°F rise RELIANCE WATER HEATERS Read Oct 4, 2026

See how advertised flow compares across tankless models

Certified figures by listed model

Model numberUEFFlow at a 67°F rise (gal/min)Recovery efficiencyDraw pattern
R4LX-220E 1**0.922.297%—

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

It warms 2.2 gallons per minute of water from 58°F to 125°F in the test. The median electric tankless model heats 0.7 gallons per minute by 67°F. Of 337 electric tankless models, 29 have a higher flow than this one.

In tests, 92% of the energy went to hot water, so its UEF is 0.92. Of the energy it spends heating water, 97% ends up in it (its recovery efficiency).

All of its test figures are shared by 2 other basic models. The A. O. Smith and State brands list one or more of them. You can find the whole group on the page for the A. O. Smith R4LA-220E 1**.

Also listed as

They carry every figure in the table above.

Updated Oct 19, 2026 · Methodology

Not covered

  • Changes to an advertised figure after the date beside it.