Hot Water List
Menu

A. O. Smith HDHE-50 4**

A. O. Smith HDHE-50 4** is not in the current certification listing as of Oct 26, 2026.

It has a labeled size of 50 gallons, a certified storage volume of 49 gallons, a certified UEF of 0.88, and a certified first-hour rating of 118 gallons of hot water.

Its advertised UEF of 0.88 from A. O. Smith matches the certified 0.88 (Read Oct 5, 2026).

  • Gas storage water heater
  • 1 listed model

This model is not in the current certification listing as of Oct 26, 2026. It was last listed on Oct 2, 2026.

Storage volume
49gallons
UEF
0.88Uniform energy factor
First-hour rating
118gallonsHot water in the first hour

Product history

A. O. Smith HDHE-50 4** left the DOE listing between Oct 2, 2026 and Oct 17, 2026.

A. O. Smith HDHE-50 4** was in the DOE listing by Oct 2, 2026.

A. O. Smith HDHE-50 4** has a recorded ENERGY STAR market-availability date of Aug 15, 2025. It first appeared in the ENERGY STAR list between October 2025 and February 2026.

Advertised and certified figures

A. O. Smith HDHE-50 4**: advertised and certified
A. O. Smith HDHE-50 4**: advertised and certified Size: advertised 50 gal, certified 49 gal (advertised nominal size, certified storage volume). Size: advertised 49 gal, certified 49 gal (certified storage volume). UEF: advertised 0.88, certified 0.88. UEF: advertised 0.88, certified 0.88 (advertised up to). Size · advertised nominal size, certified storage volume Advertised 50 gal Certified 49 gal Size · certified storage volume Advertised 49 gal Certified 49 gal UEF Advertised 0.88 Certified 0.88 UEF · advertised up to Advertised 0.88 Certified 0.88
FigureAdvertisedCertifiedAdvertiserRead
Size 50 gal, nominal size 49 gal storage volume A. O. Smith Read Oct 5, 2026
Size 49 gal 49 gal storage volume A. O. Smith Read Oct 5, 2026
UEF 0.88 0.88 A. O. Smith Read Oct 5, 2026
UEF up to 0.88 0.88 A. O. Smith Read Oct 5, 2026
First-hour rating 118 gal 118 gal A. O. Smith Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
HDHE-50 4**490.8811897%—

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

ENERGY STAR certified models

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiency
HDHE-50 4**490.8811897%

It holds 49 gallons in the test, 1 gallon less than its 50-gallon sold size. Starting full, it gives 118 gallons of hot water in its first hour of use. Reheating lets it give 69 gallons beyond the 49 gallons in its tank.

It is ENERGY STAR certified under its single model number. In the test, 12% of its energy does not reach the hot water (UEF 0.88). Of the energy spent to reheat water, 97% goes into it (its recovery efficiency).

All of its test figures are shared by 4 other basic models. They are listed under 4 other brands, one each.

It may qualify for 3 rebate programs in 3 states. It may qualify for one more if it meets terms its figures do not show.

Also listed as

They carry every figure in the table above.

Rebates

ProgramStateStatusProgram page
Colorado Springs Utilities Water heater rebate (gas storage, gas tankless) CO May qualify Its own page
Nicor Gas Energy Efficiency Rebates for Your Home (gas storage) IL May qualify if it meets the other terms Its own page
DTE Energy Water Heaters (gas storage, gas tankless) MI May qualify Its own page
Avista Home and small commercial: HVAC and water heating incentives (gas storage) WA May qualify Its own page

Programs change their terms. Check the program's own page before you buy.

Updated Oct 26, 2026 · Methodology

Not covered

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