FRIEDRICH PROG29-31U RH EC1
0.6 UEF DOE CCD · 2026-09-19Grade F: where this UEF sits among the 288 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
A gas tank, medium draw pattern (a typical three- or four-person household, about 55 gallons on a busy morning).
If you are checking the FRIEDRICH PROG29-31U RH EC1, it uses 185 therms of natural gas a year at the medium draw pattern, the standard daily hot-water usage DOE tests against. That equals its class median of 185 therms, a difference of 0 therms, among the 288 gas tank models tested at the medium draw pattern.
Energy use per year
185 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 equal to the median of 185 therms for the 288 models registered in the same heater type and draw pattern; it ranks 89 of 288, lowest energy first.
Solid line: this model (185 therms). Dashed line: the class median.
Min 148 therms Median 185 therms Max 194 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
- 0.6 DOE CCD · 2026-09-19 Compared only with other models registered as a gas tank at the medium draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Medium 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
- 58 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 28 gal DOE CCD · 2026-09-19
What it costs to install
Not published: Installed cost range
This model's rated tank size 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 · 2026-09-24What 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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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 30-gallon water heater enough?
Answered from what models in this size actually file.
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Every model on file with the Department of Energy, by heater type.
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Gas-fired storage tanks, every size and draw pattern on file.
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Every FRIEDRICH model on file
What this brand files, by heater type.
UEF 0.6 · Grade F Price it on your ZIP
This site calculated the figure of 185 therms; the registry does not list it. The calculation starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.6 for this model. That ratio is combined with the daily hot-water draw that the DOE test sets for the medium draw pattern. The UEF comes from the DOE Compliance Certification Database, retrieved 2026-09-19. The yearly figure holds only at that test draw, not at any other daily use. Among the 288 gas tank models at the medium draw pattern, this model ranks 89th lowest in energy use. That places it in the second-lowest quarter of its class. The steps are set out in how the annual cost is calculated.
The model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 58 gallons. Its rated volume is 28 gallons. DOE uses the medium draw pattern for this model, which stands for the daily hot-water use of a typical household. If a home's busiest hour needs more than 58 gallons, this rating does not cover that demand. A home that draws less hot water than the test would use less gas than 185 therms a year. A home that draws more would use more gas. To compare this model with other units by fuel, space and size, use the water heater selector. To find a model in the same class, search by model number with the same-class replacement finder.
This text gives no running cost because the cost depends on your state's average residential gas price. The page calculates it from your ZIP by applying that price to 185 therms a year at the medium draw pattern. You can run the same calculation with the cost calculator for your own ZIP. At any given gas price, a model at the class median of 185 therms would give the same yearly gas use, because the difference is 0 therms. No installed price range is published for this model. Its ratings lie outside the range that the cost database's model was built on. The site does not apply that model beyond its range, so the installed price of the FRIEDRICH PROG29-31U RH EC1 is not available here.
DOE CCD · 2026-09-19