LOCHINVAR GPCX-50L 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).
If you are checking the LOCHINVAR GPCX-50L 1** against the registry, this site's figure is 188 therms of natural gas a year. That figure applies to the high draw pattern, the standard daily hot-water usage DOE tests against. It sits 72 therms below the 260 therms median for gas tank models at that pattern.
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
- 118 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 49 gal DOE CCD · 2026-09-19
- On the market since (ENERGY STAR) the date the manufacturer told ENERGY STAR the model went on sale
- 2025-10-21 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 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 LOCHINVAR model on file
What this brand files, by heater type.
UEF 0.9 · Grade A Price it on your ZIP
This site calculated the 188 therms figure; the registry does not publish it. The figure combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. This model's UEF is 0.9, taken from the DOE CCD and retrieved 2026-09-19. The class median for the 414 models registered as a gas tank at the high draw pattern is 260 therms. This model sits 72 therms below that median. It ranks 1st for lowest energy use out of the 414. The comparison holds only at the test's daily draw. A household that uses more or less hot water than the test assumes will get a different yearly total. The page on how the annual figure is calculated explains each step.
The high draw pattern stands for 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 118 gallons. Its rated volume is 49 gallons. Both ratings describe delivery under the DOE test, not the peak demand of a particular home. A household with lighter use spread across the day falls outside the draw pattern this model was rated at. For that home, the 188 therms figure does not describe its use. If you are matching an existing unit, you can find a same-class replacement by model number. If you are starting from a different fuel or space, the selector by fuel, space and size begins from those limits instead.
The text on this page gives no running cost. The cost of 188 therms a year depends on the reader's state average residential gas price. For that reason, the page calculates the cost from the reader's ZIP. The cost calculator on your own ZIP applies that rate to this model's energy figure. Any cost it returns has the same condition as the energy figure: the high draw pattern at the test's daily draw. An installed price range is not available for this model. Its ratings lie outside the range the cost database's model was fitted on, and this site does not extend that range. The energy figure behind any calculated cost is the one retrieved on 2026-09-19.
DOE CCD · 2026-09-19