RELIANCE WATER HEATERS FMDV-50 2**
0.57 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 288 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tank, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).
Checking this listing? RELIANCE WATER HEATERS FMDV-50 2**, a gas tank, uses 194 therms of natural gas a year at the medium draw pattern. The draw pattern is the standard daily hot-water usage DOE tests against. That is 9 therms above the class median of 185 therms, ranking 278th lowest in energy use among 288 models.
Energy use per year
194 therms a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the natural gas rate where you live.
That is above the median of 185 therms for the 288 models registered in the same heater type and draw pattern; it ranks 278 of 288, lowest energy first.
Solid line: this model (194 therms). Dashed line: the class median.
Min 148 therms Median 185 therms Max 194 therms
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 0.57 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tank at the medium draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Medium DOE CCD · 2026-09-19
- First Hour Rating how many gallons of hot water the unit can deliver in one hour, starting from a full tank
- 67 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 47 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's UEF lies outside the range NLR REMDB's cost model was fitted on, and the range is not stretched past it.
The annual energy figure on this page does not depend on this range and is unaffected.
Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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Answered from what models in this size actually file.
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Every model on file with the Department of Energy, by heater type.
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Gas-fired storage tanks, every size and draw pattern on file.
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Every RELIANCE WATER HEATERS model on file
What this brand files, by heater type.
UEF 0.57 · Grade G Price it on your ZIP
The annual figure of 194 therms is computed by this site, not by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw. This model's UEF is 0.57, and the draw is the medium one. The source is DOE CCD, retrieved 2026-09-19. Compared with the class median of 185 therms, this unit uses 9 therms more per year. That puts it in the highest quarter of its class for energy use. The calculation steps are set out in how the annual cost is calculated.
This model's figure applies to the medium draw pattern only. A household whose use differs from that pattern should expect a different annual figure, and this page does not give one. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 67 gallons. The rated volume is 47 gallons. The annual figure uses the UEF and the draw, not these two ratings. A reader who wants low gas use within the class should note that this unit sits 9 therms above the median. Someone matching a unit by size can use the water heater selector by fuel, space and size.
The running cost is not stated here because it depends on the state average residential gas price. The cost calculator on your own ZIP computes it, using 194 therms of natural gas as the yearly quantity. At a higher gas price, the same 9 therms gap from the median costs more, and at a lower price it costs less. The installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. For a same-class replacement, use the replacement finder by model number.
DOE CCD · 2026-09-19