JOHN WOOD GCF-50 1**
0.69 UEF DOE CCD · 2026-09-19Grade F: where this UEF sits among the 414 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tank, high draw pattern (a larger household, or one where showers and laundry overlap).
You are checking the JOHN WOOD GCF-50 1**, a gas tank water heater. It uses 245 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 15 therms below the 260 therms median for the 414 gas tank models registered at the same draw pattern.
Energy use per year
245 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 260 therms for the 414 models registered in the same heater type and draw pattern; it ranks 130 of 414, lowest energy first.
Solid line: this model (245 therms). Dashed line: the class median.
Min 188 therms Median 260 therms Max 277 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
- 0.69 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tank at the high draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- High 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
- 84 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 48 gal DOE CCD · 2026-09-19
What it costs to install
$2,082–$3,883 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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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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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 50-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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All gas tank water heaters
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 0.69 · Grade F Price it on your ZIP
The 245 therms figure is not a registry field. This site calculated it from the registry's UEF, the ratio of hot water delivered to energy used. It also used the DOE test's daily hot-water draw for the high draw pattern. For this model the UEF is 0.69, from DOE CCD data retrieved 2026-09-19. Among the 414 gas tank models at the high draw pattern, it ranks 130th lowest in energy use. That puts it in the second-lowest quarter of its class for energy use. Each step of the calculation is set out in the method behind the annual energy and cost figures. A plumber or seller can check these values against the registry entry for GCF-50 1**.
The high draw pattern represents a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 84 gallons. Its rated volume is 48 gallons. A home with lighter daily use does not match the test condition, so its yearly energy use will differ from 245 therms. The registry data does not show how large that difference would be. The rating also does not cover a home that needs more than 84 gallons in the first hour. To compare other units registered at the same draw pattern, use the same-class replacement search by model number.
The running cost is not given in this text. It depends on your state's average residential gas price, so the page calculates it from your ZIP. The 15 therms gap below the class median can only be priced at that same rate. The water heater cost calculator for your ZIP shows the yearly cost of 245 therms of natural gas. The installed price range has its own block on this page, with its source and date. That range is a modeled installed cost, not a quote. This model's energy use under draw patterns other than high is not available.
DOE CCD · 2026-09-19