Ruud PROG40-36U RH67 PV*
0.64 UEF DOE CCD · 2026-09-19Grade E: 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 Ruud PROG40-36U RH67 PV*, this gas tank water heater uses 173 therms of natural gas a year. That figure applies at the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 12 therms below the median of 185 therms for the 288 gas tank models registered at the same draw pattern.
Energy use per year
173 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 185 therms for the 288 models registered in the same heater type and draw pattern; it ranks 44 of 288, lowest energy first.
Solid line: this model (173 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
- 0.64 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
- 67 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 39 gal DOE CCD · 2026-09-19
What it costs to install
$1,658–$2,800 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
-
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.
-
Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
-
What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
-
Is a 40-gallon water heater enough?
Answered from what models in this size actually file.
-
Water heaters
Every model on file with the Department of Energy, by heater type.
-
All gas tank water heaters
Gas-fired storage tanks, every size and draw pattern on file.
-
Every Ruud model on file
What this brand files, by heater type.
UEF 0.64 · Grade E Price it on your ZIP
The 173 therms figure comes from this site's calculation. The registry does not publish it. The calculation combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily draw for this pattern. This model's UEF is 0.64, as listed in the DOE Compliance Certification Database and retrieved on 2026-09-19. This model ranks 44th lowest in energy use among the 288 gas tank models at the medium draw pattern. The ranking compares test results only. It does not describe how the unit performs in a particular home. If your household uses more or less hot water than the test assumes, your gas use will differ. The registry does not show how large that difference would be. Our method for turning registry data into an annual cost sets out each step.
DOE uses the medium draw pattern to represent a typical mid-sized household. The 173 therms figure applies to homes whose hot-water use is close to that pattern. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 67 gallons. Its rated volume is 39 gallons. This rating does not cover a household that needs more than 67 gallons in its busiest hour. For such a home, the energy figure and the rank of 44th both describe the test, not actual use. The water heater selector by fuel, space and size filters other models for that case. If you are matching a unit already in place, you can find a same-class replacement by model number.
This text does not state a running cost. The cost of 173 therms of natural gas depends on your state's average residential gas price, so the page calculates it from your ZIP. You can also enter a ZIP in the cost calculator for your own gas rate. The same condition applies to the gap of 12 therms below the class median of 185 therms. What that gap means for your bill depends on your rate and holds only at the medium draw pattern. The registry does not show the gap at other usage levels. The installed price range appears in its own block on this page, with its source and date. That range is a modeled installed cost, not a quote, and it is kept separate from the energy figures above.
DOE CCD · 2026-09-19