Hot Water List
Menu

American FMHR-40 4**

American FMHR-40 4** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 1 listed model

Not listed as ENERGY STAR certified on Oct 26, 2026.

Its figures are also listed under A. O. Smith FMHR-40 4**.

Storage volume
38gallons
UEF
0.58Uniform energy factor
First-hour rating
59gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

American FMHR-40 4**: advertised and certified
American FMHR-40 4**: advertised and certified Size: advertised 40 gal, certified 38 gal (advertised nominal size, certified storage volume). Size: advertised 38 gal, certified 38 gal (certified storage volume). UEF: advertised 0.58, certified 0.58. First-hour rating: advertised 59 gal, certified 59 gal. Size · advertised nominal size, certified storage volume Advertised 40 gal Certified 38 gal Size · certified storage volume Advertised 38 gal Certified 38 gal UEF Advertised 0.58 Certified 0.58 First-hour rating Advertised 59 gal Certified 59 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 38 gal storage volume American Read Oct 4, 2026
Size 38 gal 38 gal storage volume American Read Oct 4, 2026
UEF 0.58 0.58 American Read Oct 4, 2026
First-hour rating 59 gal 59 gal American Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
MHG62-40T35R 4**380.585978%Medium

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

It holds 38 gallons in the test, 2 gallons less than its 40-gallon sold size. Starting full, it gives 59 gallons of hot water in its first hour of use. That is 21 gallons more than its tank holds, since it reheats during the hour. In the first hour, 705 of the 763 gas storage models give more hot water. The median gas storage model gives 78 gallons in the first hour of the test.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In tests, 58% of the energy it uses ends up as hot water (UEF 0.58). In the test, daily hot water use was set to medium (its draw pattern). Of 288 gas storage models with the same draw pattern, 230 have a higher UEF. On its draw pattern, the median gas storage UEF is 0.60. The water took in 78% of the energy used to reheat it (its recovery efficiency).

All of its test figures are shared by 4 other basic models. Each of the 4 other brands lists one of them. For the full group, see the A. O. Smith FMHR-40 4** page.

Also listed as

They carry every figure in the table above.

Updated Oct 26, 2026 · Methodology

Not covered

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