Water Heaters
Richmond10E40-HP5U15
ENERGY STAR certified · Oct 2026
- Annual energy use
- 643 kWh/yr
- Tank size
- 36 gal
- Uniform energy factor
- 3.45
Running cost calculator
Rate used: 48.000 ¢/kWh · Hawaii statewide average, EIA, July 2026.
Where your state sits among all 51
Typical cost to run a water heater in Hawaii · Cost to run a water heater in every state
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How this is calculated
- Annual energy use is the figure ENERGY STAR lists for this model under typical test conditions. It is not measured in your home.
- Yearly cost = annual kWh × your rate. Monthly cost is the yearly cost divided by 12, a flat average. Five-year cost keeps the rate constant; prices will change.
- Statewide averages are not your utility’s tariff. Use your bill’s rate for a closer number.
- We do not estimate watts or hourly cost: the source data does not include them.
How it compares
Among 154 ENERGY STAR certified 240 volt integrated HPWH models with a similar tank size (27 to 45 gal), this one ranks 1st lowest in annual energy use.
- Median of these models
- 859 kWh/yr
- This model vs the median
- -25%
- Uses less than
- 92% of them
At the rate used above (Hawaii statewide average, EIA, July 2026), that is about $103.68 a year less than the median of these models, $1037 over ten years at today’s price.
Compared with every comparable model on the ENERGY STAR list, not only the ones published on this site. Same type, similar size.
Yearly cost by state
Same 643 kWh/yr at each state’s average residential price (2026-07).
Comparable models
Same type, within 25% of this model’s tank size.
Specifications
- Annual energy use
- 643 kWh/yrENERGY STAR estimated annual electricity use for the rated usage pattern
- Tank size
- 36 galStorage volume
- Uniform energy factor
- 3.45 Uniform Energy Factor
- Type
- 240 Volt Integrated HPWH
- Rated usage
- Low-Usage
- First-hour rating
- 46 gal
- Electric input
- 2.3 kW
- Maximum amps
- 12.0
- Input voltage
- 240
- Tank height
- 62.3 in
- Tank diameter
- 20.3 in
- Refrigerant
- R-134a
- Refrigerant and GWP
- R-134a (GWP:1430)
- Connected
- Yes
- Markets
- United States
- Available on market
- 2020-04-30
- ENERGY STAR ID
- 3554168
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Frequently asked questions
How much electricity does the Richmond 10E40-HP5U15 use?
ENERGY STAR lists 643 kWh per year under typical test conditions, as ENERGY STAR publishes it for the usage pattern of the rating. Your use will differ with household size, how much hot water you draw and the temperature of the room the heater sits in.
How much does it cost to run?
At statewide average residential prices, the listed annual use costs about $81.79 in Louisiana and $308.64 in Hawaii (EIA, 2026-07). Your own utility rate may be different; enter it in the calculator.
How does the Richmond 10E40-HP5U15 compare with similar models?
Among 154 ENERGY STAR certified 240 volt integrated HPWH models with a similar tank size, it ranks 1st lowest in annual energy use. Its 643 kWh per year is 25% below the median of 859 kWh.
What does the uniform energy factor mean?
It is the hot water delivered for each unit of energy the water heater uses, so a higher number means lower running cost. This model is listed at 3.45. A heat pump water heater scores far above a conventional electric one because it moves heat instead of making it.
Learn more
Methodology and sources
Model data comes from the ENERGY STAR Certified Water Heaters dataset (EPA). Electricity prices are statewide average residential prices from the U.S. EIA, latest period July 2026. Values are stored locally and refreshed by scheduled imports. Missing values are left blank, never estimated.