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RELIANCE WATER HEATERS GDV-40 3**

RELIANCE WATER HEATERS GDV-40 3** is in the DOE listing as of Oct 26, 2026.

  • Gas storage water heater
  • 2 listed models

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

Its figures are also listed under A. O. Smith GDV-40 3**.

Storage volume
39gallons
UEF
0.60Uniform energy factor
First-hour rating
64gallonsHot water in the first hour
See it among every gas storage model

Advertised and certified figures

RELIANCE WATER HEATERS GDV-40 3**: advertised and certified
RELIANCE WATER HEATERS GDV-40 3**: advertised and certified Size: advertised 40 gal, certified 39 gal (advertised nominal size, certified storage volume). Size: advertised 39 gal, certified 39 gal (certified storage volume). UEF: advertised 0.60, certified 0.60. First-hour rating: advertised 64 gal, certified 64 gal. Size · advertised nominal size, certified storage volume Advertised 40 gal Certified 39 gal Size · certified storage volume Advertised 39 gal Certified 39 gal UEF Advertised 0.60 Certified 0.60 First-hour rating Advertised 64 gal Certified 64 gal
FigureAdvertisedCertifiedAdvertiserRead
Size 40 gal, nominal size 39 gal storage volume RELIANCE WATER HEATERS Read Oct 5, 2026
Size 39 gal 39 gal storage volume RELIANCE WATER HEATERS Read Oct 5, 2026
UEF 0.60 0.60 RELIANCE WATER HEATERS Read Oct 5, 2026
First-hour rating 64 gal 64 gal RELIANCE WATER HEATERS Read Oct 5, 2026

Certified figures by listed model

Model numberStorage volume (gal)UEFFirst-hour rating (gal)Recovery efficiencyDraw pattern
6-40-HBDS 3*1390.606475%Medium
6-40-YBDS 3**390.606475%Medium

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

It holds 39 gallons in the test, 1 gallon less than its 40-gallon sold size. Over one hour from a full tank, it gave 64 gallons in the test (its first-hour rating). Its tank holds 39 gallons, so reheating adds 25 gallons during the first hour. Among 763 gas storage models, 629 have a higher first-hour rating. Among gas storage models, the median first-hour rating is 78 gallons.

It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 60% of the energy it uses ends up as hot water (UEF 0.60). Its test ran at the medium level of daily hot water use. Its UEF is lower than that of 88 of the 288 gas storage models with its draw pattern. On its draw pattern, its UEF is also the median gas storage UEF. Of the energy spent to reheat water, 75% goes into it (its recovery efficiency).

Its 2 model numbers are 6-40-HBDS 3*1 and 6-40-YBDS 3**. There are 4 more basic models with the same test figures. Each of them is listed under a different brand. For the full group, see the A. O. Smith GDV-40 3**.

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.