JOHN WOOD GCFL-40 1**
0.66 UEF DOE CCD · 2026-09-19Grade D: 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).
You are checking this model's energy figure. The JOHN WOOD GCFL-40 1** gas tank uses 168 therms of natural gas a year. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 17 therms below the class median of 185 therms, and it ranks 27th lowest of 288 models.
Energy use per year
168 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 below the median of 185 therms for the 288 models registered in the same heater type and draw pattern; it ranks 27 of 288, lowest energy first.
Solid line: this model (168 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
- 0.66 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
- 65 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 38 gal DOE CCD · 2026-09-19
What it costs to install
$1,760–$3,064 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Safety 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 40-gallon water heater enough?
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 JOHN WOOD model on file
What this brand files, by heater type.
UEF 0.66 · Grade D Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.66 for this model. The annual figure of 168 therms is not a registry value. This site computed it. It combined the registry's UEF with the daily hot-water draw in the DOE test for the medium draw pattern. The source is DOE CCD, retrieved 2026-09-19. The result is 17 therms below the class median of 185 therms. That places the unit in the lowest quarter of its class for energy use. Read how the annual cost is calculated to check the method.
The figure suits a household whose hot-water use resembles the medium draw pattern, a typical household on a busy morning. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 65 gallons. The rated volume is 38 gallons. A household that needs more than 65 gallons in a busy hour is outside what this rating covers. The 168 therms figure also does not describe any other draw pattern, because the data used here gives no value for one. The water heater selector filters by fuel, space and size.
The running cost is not stated here. It depends on the state average residential gas price, so it has to be computed from your own rate. Multiply 168 therms by your gas price per therm to get a yearly cost. The cost calculator does this from your ZIP. The 168 therms figure applies to natural gas only, and a value for any other fuel is not available. The gap of 17 therms from the class median of 185 therms is a difference in energy, not in cost. Every one of the 288 models in the class is compared at the same draw pattern, so the rank of 27th lowest is a like-for-like position. To find a same-class unit, use the replacement finder by model number.
DOE CCD · 2026-09-19