ECOSENSE RHE40SP
0.75 UEF DOE CCD · 2026-09-19Grade A: 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 verifying this gas tank model, its annual energy use is 148 therms of natural gas. That figure is for the medium draw pattern, the standard daily hot-water usage DOE tests against. It is 37 therms below the class median of 185 therms.
Energy use per year
148 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 1 of 288, lowest energy first.
Solid line: this model (148 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
- 0.75 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
- 68 gal DOE CCD · 2026-09-19
- Rated Storage Volume the tank size in gallons
- 37 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
-
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.
UEF 0.75 · Grade A Price it on your ZIP
The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.75 for the ECOSENSE RHE40SP. The registry does not publish annual energy for this model, so the figure is not a registry value. This site computed 148 therms from that UEF and the DOE test's daily hot-water draw for the medium draw pattern. The fuel is natural gas. The source is the DOE CCD, retrieved 2026-09-19. The figure describes the federal test, not a measured household. A home that draws more or less hot water than the test will use a different amount of gas.
The class is the 288 models registered as a gas tank at the medium draw pattern. Its class median is 185 therms a year, and this model is 37 therms below it. It ranks 1st lowest in energy use of 288, which is in the lowest quarter of its class. The comparison does not cover other fuels, other heater types or other draw patterns. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 68 gallons. The rated volume is 37 gallons. The figure suits a household whose hot-water use resembles the medium draw pattern. It does not describe a household whose busiest hour needs more hot water than the first hour rating provides.
Running cost is not stated here because it depends on the state average residential gas price. The cost calculator applies that price for your ZIP to the 148 therms figure. The annual cost methodology explains how that calculation works. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To compare this unit with others, find a same-class replacement by model number. Any cost figure for RHE40SP should trace back to 148 therms at the medium draw pattern and your own gas rate.
DOE CCD · 2026-09-19