Envirosense Reliance Home Comfort GPCT-40L 1**
0.9 UEF DOE CCD · 2026-09-19Grade A: 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).
Checking this model? Envirosense Reliance Home Comfort GPCT-40L 1** uses 188 therms of natural gas a year at the high draw pattern, the standard daily hot-water usage DOE tests against. That is 72 therms below the class median of 260 therms, ranking 1st lowest of 414 gas tank models.
Energy use per year
188 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 1 of 414, lowest energy first.
Solid line: this model (188 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
- 0.9 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
- 86 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 38 gal DOE CCD · 2026-09-19
- On the market since (ENERGY STAR) the date the manufacturer told ENERGY STAR the model went on sale
- 2021-10-01 ENERGY STAR · 2026-09-19
- Connected / demand response (ENERGY STAR) whether the unit can take signals from your utility to shift when it heats, and by which standard (such as CTA-2045)
- No ENERGY STAR · 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 · 2026-09-24Does it fit your space?
Enter your own numbers below — this compares them to what ENERGY STAR publishes for this model, it does not tell you what to buy.
- Dimensions (ENERGY STAR)
- the unit's filed height, width, depth or tank diameter, in inches
- Input voltage and maximum current (ENERGY STAR)
- the circuit voltage the unit is certified on and the most current it draws
- Vent type and size (ENERGY STAR)
- how a gas unit is vented, the vent's diameter and the height of its vent connector
What 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 40-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.
UEF 0.9 · Grade A Price it on your ZIP
The UEF, the ratio of hot water delivered to energy used, is 0.9. This site computed the figure of 188 therms, not the registry. It combines that UEF with the DOE test's daily hot-water draw for this draw pattern. The fuel is natural gas, and the source is DOE CCD, retrieved 2026-09-19. The figure holds only at the high draw pattern, and this page gives no value for any other draw pattern. The 72 therms gap to the class median of 260 therms compares this model only with the 414 models registered as a gas tank at that same draw pattern. The method is set out under how the annual cost is calculated.
The high draw pattern describes 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 86 gallons, and its rated volume is 38 gallons. The energy figure of 188 therms applies to a household whose use matches that test draw. A household with lighter or heavier use than the test draw would see different energy use, and the registry data does not say by how much. Whether the first hour rating covers your busiest hour is not shown by this data. The water heater selector by fuel, space and size filters models on those inputs.
The running cost is not stated here because it depends on your state average residential gas price. Multiplying 188 therms by that price gives the yearly gas cost at the high draw pattern, and the cost calculator on your own ZIP does this for you. The page needs only your ZIP to look up that price. No amount is estimated on this page. The installed price range is not published. This model's ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To compare a same-class unit, find a same-class replacement by model number, starting from GPCT-40L 1**.
DOE CCD · 2026-09-19