Hot water statistics span energy, water demand, equipment choices, household costs and injury outcomes. The strongest available figures are U.S.-centered, and they mix surveys, modeled estimates, design targets and injury surveillance, so each number needs its population and measurement period.
Key Hot Water Statistics
The most broadly useful figures are:
- In 2020, water heating, lighting and refrigeration together accounted for 25% of total annual U.S. home energy use.
- In 2020, space heating and air conditioning together accounted for 52% of annual U.S. household energy consumption.
- Water heating is typically about 12% of a U.S. home’s utility bill, according to Department of Energy guidance.
- In the final 2020 RECS estimate, 59.33 million U.S. primary occupied homes used natural gas as their main water-heating fuel.
- In the final 2020 RECS estimate, 57.04 million U.S. primary occupied homes used electricity as their main water-heating fuel.
- In 2020, 79% of California households used natural gas for water heating.
- Showers accounted for nearly 17% of U.S. residential indoor water use in the EPA WaterSense estimate.
- An average U.S. family uses nearly 40 gallons of water per day for showering.
- A WaterSense-labeled showerhead uses no more than 2.0 gallons per minute, compared with 2.5 gallons per minute for a standard showerhead.
- One WaterSense showerhead can save an average U.S. family 2,700 gallons of water per year.
- The modeled WaterSense showerhead retrofit can save more than 330 kilowatt-hours of electricity per year for an average U.S. family.
- The same modeled retrofit can save more than $75 in annual water and energy costs.
- An ENERGY STAR-certified heat-pump water heater can save a modeled four-person U.S. household about $550 per year versus a standard electric water heater.
- The modeled four-person household saves 3,760 kilowatt-hours per year with the certified heat-pump water heater.
- In the ENERGY STAR model, a four-person household reaches payback in 2.7 years.
- In the CDC’s 2001–2006 analysis, hot water or steam caused 30% of nonfatal scald-burn emergency-department visits among U.S. adults aged 65 and older.
- The CPSC’s 2024 report estimated about 4,100 annual senior scalding-burn injuries associated with hot water.
Contents
- Key Hot Water Statistics
- Household Energy and Water-Heating Scale
- Water-Heating Fuels and Regional Data
- Showers, Fixtures and Indoor Water Demand
- Hot Water Efficiency and Delivery Systems
- Heat-Pump Water-Heater Costs and Savings
- Hot Water Scald Injuries and Outcomes
Household Energy and Water-Heating Scale
Water heating is a meaningful household energy expense, but the available 2020 national energy figures do not isolate it in every comparison. The Energy Information Administration reports that water heating, lighting and refrigeration together represented 25% of total annual U.S. home energy use in 2020, while space heating and air conditioning represented 52%.
The combined 25% figure should not be read as a water-heating-only share. Similarly, the 52% figure is a contextual comparator rather than a hot-water measure. EIA, Use of energy in homes
DOE guidance places water heating at typically about 12% of a home’s utility bill. That is a typical estimate, not a fixed national bill share: fuel, climate, equipment, household behavior and utility rates can change the result. U.S. Department of Energy, Why Energy Efficiency Matters
Other 2020 EIA context helps define the energy system around hot water:
- Retail electricity purchases supplied about 44% of U.S. residential-sector end-use energy consumption.
- Natural gas was used in 58% of U.S. homes for any household purpose, not specifically for water heating.
- Petroleum supplied about 8% of U.S. residential-sector end-use energy consumption, including heating oil, kerosene and LPG.
- Renewable sources including geothermal, solar and wood supplied about 5% of U.S. residential-sector end-use energy consumption.
- Approximately 13% of U.S. households used a heat pump as their main space-heating equipment, which is not a measure of heat-pump water-heater adoption.
The same EIA source estimated that a detached single-family household used nearly three times as much energy as a household in an apartment building with five or more apartments in 2020. That ratio covers all household energy uses, not hot water alone. EIA, Use of energy in homes
Water-Heating Fuels and Regional Data
The final 2020 Residential Energy Consumption Survey provides a direct view of primary water-heating fuels among U.S. primary occupied housing units. The survey excludes vacant, seasonal and second homes, military housing and group quarters.
| Main water-heating fuel | Homes in final 2020 RECS estimate |
|---|---|
| Natural gas | 59.33 million |
| Electricity | 57.04 million |
| Fuel oil or kerosene | 4.12 million |
| Propane | 2.62 million |
| Some other fuel | 0.41 million |
The small “some other fuel” category had a 16.08% relative standard error in the final table. These are survey estimates for primary occupied housing units, not a census of every U.S. residence. EIA, 2020 RECS Technical Documentation
The final electricity estimate was 1.2 million homes lower than the preliminary estimate. This is a revision between preliminary and final releases, not evidence that electricity water heating declined by 1.2 million homes between years. EIA, 2020 RECS Technical Documentation
Selected state figures illustrate why national averages need geographic context:
- California’s final 2020 RECS estimate counted 2.48 million households using electricity for water heating, compared with 2.78 million in the preliminary estimate; the change is a survey revision.
- In 2020, 79% of California households used natural gas for water heating. The EIA statement describes household fuel use, and the percentage should not be treated as a universal exclusive-fuel rule.
- In 2020, 77% of Florida homes were all-electric, representing about 6.2 million homes. “All-electric” describes the household’s only energy source, not necessarily its water-heater technology.
- In 2020, 72% of Hawaii homes were all-electric, representing about 0.34 million homes. This is likewise a household energy-source measure rather than a direct water-heater type measure.
Showers, Fixtures and Indoor Water Demand
EPA WaterSense estimates describe the water side of hot-water demand, but most of these figures measure total water rather than heated water exclusively. Showers accounted for nearly 17% of residential indoor water use, and the average family used nearly 40 gallons per day for showering.
Across the United States, households used nearly 1.2 trillion gallons annually for showering in the EPA estimate. The average American used 82 gallons of water per day at home in the 2015 USGS estimate cited by EPA; that total includes all household water, not hot water alone. EPA WaterSense, Showerheads and EPA WaterSense, About WaterSense
Flow-rate standards provide a more specific fixture comparison:
| Fixture measure | Flow rate or result |
|---|---|
| Standard showerhead reference | 2.5 gallons per minute |
| WaterSense-labeled showerhead maximum | 2.0 gallons per minute |
| WaterSense faucet or aerator efficiency improvement | About 30% |
| Old faucet or aerator replacement estimate | About 700 gallons saved per year |
The 2.0-gallon-per-minute figure is a WaterSense certification threshold, not a prediction of every household’s actual flow. The faucet savings estimate is for an average family and includes water savings that are not necessarily all hot water. EPA WaterSense, Showerheads and EPA WaterSense, About WaterSense
Bathrooms use more than 50% of all indoor household water in the WaterSense estimate. About 5% to 10% of U.S. homes have easy-to-fix leaks that drip away at least 90 gallons per day, although those leaks may involve hot- or cold-water fixtures. EPA WaterSense, About WaterSense
Hot Water Efficiency and Delivery Systems
WaterSense modeling connects efficient shower fixtures with both water and energy outcomes. One WaterSense showerhead can save an average family 2,700 gallons of water per year, more than 330 kilowatt-hours of electricity per year, and more than $75 in annual water and energy costs.
These are modeled retrofit estimates. Actual results vary with shower duration, household behavior, heater fuel, equipment efficiency and utility rates. EPA WaterSense, Shower Better and EPA WaterSense, Showerheads
EPA also modeled a nationwide scenario in which every U.S. home replaced existing showerheads. The potential annual savings exceeded 260 billion gallons of water and nearly $5.4 billion in water and energy costs, but this is a scenario estimate rather than an observed national outcome. EPA WaterSense, Shower Better
A case study shows the difference between a national model and an observed institutional result. Kennesaw State University reduced dormitory water use by about 28% after switching to WaterSense showerheads, saving more than 650,000 gallons and $6,500 over six months in 2014; the campus conditions, tariff and occupancy do not necessarily generalize to homes. EPA WaterSense, Shower Better
Hot-water delivery design addresses the volume sitting between a source and fixture. EPA WaterSense labeled-home guidance recommends storing no more than 0.5 gallons between the hot-water source and any fixture, and describes fixtures within 10 feet of a recirculation loop as a typical application for demand-initiated recirculation systems.
These are design guidance figures, not national installation averages. EPA WaterSense, WaterSense Labeled Homes—Hot Water
Heat-Pump Water-Heater Costs and Savings
ENERGY STAR models show how household size changes the economics of a certified heat-pump water heater compared with a standard electric water heater. The figures are modeled estimates based on stated electricity prices, incremental cost and equipment-life assumptions.
| Household size | Annual electricity saving | Annual bill saving | Modeled payback |
|---|---|---|---|
| Two people | 1,880 kWh | $270 | 5.5 years |
| Three people | 2,820 kWh | $410 | 3.7 years |
| Four people | 3,760 kWh | About $550 | 2.7 years |
For the modeled four-person household, the incremental cost was $1,503, the assumed electricity price was $0.146 per kilowatt-hour, and lifetime savings exceeded $5,610 over a 13-year lifespan. These assumptions mean the results are not guarantees for every home. ENERGY STAR, Save More with ENERGY STAR Certified Heat Pump Water Heaters
ENERGY STAR also presents a counterfactual national scenario: if all electric water heaters sold in the United States were ENERGY STAR-certified heat-pump models, annual energy-cost savings would be about $8 billion and approximately 150 billion pounds of greenhouse-gas emissions would be prevented annually. This is a forecast-style adoption scenario, not current market performance, and it depends on grid and equipment assumptions. ENERGY STAR, Save More with ENERGY STAR Certified Heat Pump Water Heaters
Hot Water Scald Injuries and Outcomes
Hot-water safety statistics depend heavily on age, case definition, surveillance period and treatment setting. CDC data for 2001–2006 and a CPSC estimate published in 2024 should not be combined as one trend line.
Among U.S. adults aged 65 and older, hot water or steam caused 30% of nonfatal scald-burn emergency-department visits in the CDC analysis. The estimated rate was 7.2 visits per 100,000 people, with 8,620 initial emergency-department visits annually and 51,700 non-work-related initial visits across the six-year period.
| CDC older-adult measure | 2001–2006 result |
|---|---|
| Visits caused by hot water or steam | 30% of nonfatal scald-burn ED visits |
| Hot-water or steam rate | 7.2 per 100,000 people |
| Estimated annual initial ED visits | 8,620 |
| Estimated six-year initial ED visits | 51,700 |
| Visits occurring at home | 76% of identified visits |
| Bathrooms among at-home visits | 11% |
The CDC location figures came from 705 identified emergency-department records, so they are not a bathroom-specific population risk. Upper-extremity injuries accounted for 42% of visits and lower-extremity injuries for 38%; 93% ended in discharge after treatment and 4.2% resulted in hospitalization.
The surveillance period is older, and later outcomes were not measured. CDC, Nonfatal Scald-Related Burns Among Adults Aged ≥65 Years — United States, 2001–2006
The CPSC’s 2024 report used a different population and coding system, estimating an annual average of 6,400 ED-treated scalding-burn injuries among U.S. seniors. Hot water alone represented 63.6%, or about 4,100 injuries annually, under the report’s product-associated coding assumption; this is not an estimate of every hot-water injury nationwide. CPSC, Senior Injuries and Deaths Associated with Consumer Products: 2024 Report