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Lochinvar FMDV-50 2**

Lochinvar FMDV-50 2** 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 FMDV-50 2**.

Storage volume
47gallons
UEF
0.57Uniform energy factor
First-hour rating
67gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

Lochinvar FMDV-50 2**: advertised and certified
Lochinvar FMDV-50 2**: advertised and certified Size: advertised 50 gal, certified 47 gal (advertised nominal size, certified storage volume). Size: advertised 47 gal, certified 47 gal (certified storage volume). UEF: advertised 0.57, certified 0.57. First-hour rating: advertised 67 gal, certified 67 gal. Size · advertised nominal size, certified storage volume Advertised 50 gal Certified 47 gal Size · certified storage volume Advertised 47 gal Certified 47 gal UEF Advertised 0.57 Certified 0.57 First-hour rating Advertised 67 gal Certified 67 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 50 gal, nominal size 47 gal storage volume Lochinvar Read Oct 4, 2026
Size 47 gal 47 gal storage volume Lochinvar Read Oct 4, 2026
UEF 0.57 0.57 Lochinvar Read Oct 4, 2026
First-hour rating 67 gal 67 gal Lochinvar Read Oct 4, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
MGN05040 2**470.576777%Medium

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

It holds 47 gallons in the test, 3 gallons less than its 50-gallon sold size. It delivers 67 gallons of hot water in the test's first hour. Its tank holds 47 gallons, so reheating adds 20 gallons during the first hour. Of 763 gas storage models, 552 give more hot water in the first hour. The median gas storage model gives 78 gallons in its first hour.

On Oct 26, 2026, this heater was not listed as ENERGY STAR certified. In the test, 43% of its energy does not reach the hot water (UEF 0.57). Its test simulated a day of medium hot water use (its draw pattern). Of 288 gas storage models with the same draw pattern, 277 have a higher UEF. For its type and draw pattern, the median UEF is 0.60. The water took in 77% of the energy used to reheat it (its recovery efficiency).

There are 4 more basic models with the same test figures. They are listed under 4 other brands, one each. You can find the whole group on the page for the A. O. Smith FMDV-50 2**.

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.