STATE TK-510U-E 2**
0.81 UEF DOE CCD · 2026-09-19Grade G: where this UEF sits among the 397 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tankless unit, high draw pattern (a larger household, or one where showers and laundry overlap).
Checking the STATE TK-510U-E 2**, a gas tankless unit? This site computes its yearly use at 209 therms of natural gas at the high draw pattern, the standard daily hot-water usage DOE tests against. That figure sits 27 therms above the class median of 182 therms. It ranks 323rd lowest in energy use of 397 models.
Energy use per year
209 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 above the median of 182 therms for the 397 models registered in the same heater type and draw pattern; it ranks 323 of 397, lowest energy first.
Solid line: this model (209 therms). Dashed line: the class median.
Min 173 therms Median 182 therms Max 209 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
- 0.81 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tankless unit at the high draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- High DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 5 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,698–$2,632 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
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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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How to size a tankless water heater by GPM
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 tankless water heaters
Gas-fired instantaneous units, sized by flow rate rather than tank gallons.
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Every STATE model on file
What this brand files, by heater type.
UEF 0.81 · Grade G Price it on your ZIP
The 209 therms figure does not come directly from the registry. This site derived it from the model's UEF, the ratio of hot water delivered to energy used. The registry lists that ratio as 0.81 for this model. The calculation pairs it with the daily hot-water draw that the DOE test sets for the high draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The total holds only at that test draw. A household that draws more or less hot water each day will use a different amount, and the registry does not give that amount. Against the 397 gas tankless models registered at the same draw pattern, this unit falls in the highest quarter for energy use. The steps behind the figure are set out in how the annual energy and cost are calculated.
The high draw pattern describes a larger household, or one where showers and laundry overlap. That is the use profile the 209 therms figure was computed for. The registry lists this unit's maximum flow rate in gallons per minute as 5. Whether that flow covers a given home's overlapping showers and laundry depends on its fixtures, which the registry does not record. For a reader who ranks yearly gas use first, the 323rd position of 397 matters. Most models registered in the same class record lower energy use than this one. To compare this unit against those models, use the tool to find a same-class replacement by model number. Any unit it returns is tested at the same draw pattern, so the energy figures compare directly.
The running cost is not stated in this text. It depends on your state's average residential gas price, so the page computes it from your ZIP code, with 209 therms as the energy input. The cost calculator on your own ZIP shows that result. The 27 therms gap to the class median carries into that cost at whatever rate applies. At any gas price, this unit costs more per year to run than a model at the median, under the test draw. Your household's actual draw, and therefore its actual bill, is not available from the registry. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote.
DOE CCD · 2026-09-19