RELIANCE WATER HEATERS GCB-30R 4**
0.6 UEF DOE CCD · 2026-09-19Grade F: 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 RELIANCE WATER HEATERS GCB-30R 4**? It uses 185 therms of natural gas a year at the medium draw pattern, the standard daily hot-water usage DOE tests against. That is 0 therms from the class median of 185 therms, and it ranks 89th lowest of 288 gas tank models.
Energy use per year
185 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 equal to the median of 185 therms for the 288 models registered in the same heater type and draw pattern; it ranks 89 of 288, lowest energy first.
Solid line: this model (185 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
- 0.6 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
- 62 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 29 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's rated tank size 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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Is a 30-gallon water heater enough?
Answered from what models in this size actually file.
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Water heaters
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 0.6 · Grade F Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.6 for this model. The registry does not publish an annual energy figure. This site computed 185 therms from that UEF and the DOE test's daily hot-water draw for the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. The difference from the class median of 185 therms is 0 therms, so the model sits at the median. Its rank of 89th lowest of 288 places it in the quarter just above the lowest-use quarter of its class. The figure applies only to the medium draw pattern. Values for other draw patterns are not available on this page.
The first hour rating, the gallons of hot water available in the first hour from a full tank, is 62 gallons, for a rated volume of 29 gallons. That suits a household whose busy-morning use matches the medium draw pattern. A household whose peak-hour demand exceeds 62 gallons falls outside what this rating shows. Households with lighter or heavier daily use than the test's draw will see gas use different from 185 therms, and the registry data does not say by how much. To compare fuel, space and size across other units, use the water heater selector by fuel, space and size. To match this class, find a same-class replacement by model number.
Running cost depends on the state average residential gas price, so this page states no cost figure. The cost calculator on your own ZIP applies that price to 185 therms, the figure for the medium draw pattern. The method for calculating the annual cost explains each step. An installed price range is not published for this model. Its ratings, a first hour rating of 62 gallons and a rated volume of 29 gallons, lie outside the range the cost database's model was fitted on, and that range is not stretched past its limit. The installed price is therefore unknown here.
DOE CCD · 2026-09-19