STATE TK-310U-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).
For anyone verifying this unit: the STATE TK-310U-E 2**, a gas tankless unit, uses 209 therms of natural gas a year. That figure belongs to the high draw pattern, the standard daily hot-water usage DOE tests against. At that draw it sits 27 therms above its class median of 182 therms.
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
- 4.8 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
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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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 is computed by this site, not taken from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw DOE's test sets for the high draw pattern. This model's UEF at the high draw pattern is 0.81, from the DOE CCD, retrieved 2026-09-19. The annual figure holds at the test's daily draw only. It does not describe a household that draws more or less hot water than the test assumes. Among the 397 models registered as a gas tankless unit at the high draw pattern, it ranks 323rd for lowest energy use. That places it in the highest quarter of its class for energy use. The method behind the annual energy and cost figures sets out each step.
The high draw pattern describes a larger household, or one where showers and laundry overlap. This unit's maximum flow rate in gallons per minute is 4.8, as listed in the registry. A reader checking fit for that kind of household can set this flow rate against the fixtures that run at the same time. The annual figure does not carry over to a smaller household's usage, because it applies to the high draw pattern only. For a reader whose main check is annual gas use, the class comparison matters more. At the same test draw, the class median model uses 182 therms, which is 27 therms less than this unit. To see other models registered in the same class, find a same-class replacement by model number.
The running cost is not stated in this text. It depends on the average residential natural gas price in the reader's state, so the page computes it from the reader's ZIP. The input stays at 209 therms a year at the high draw pattern; only the gas price changes. The gap to the class median noted above carries into cost in the same direction. At any single gas rate, this unit costs more to run than the class median model at the test draw. The running-cost calculator for your own ZIP applies your state's rate. The modeled installed-cost range appears in its own block on this page, with its source and date; it is not a quote.
DOE CCD · 2026-09-19