Editorial review as of September 3, 2026. Sources cited in the article were verified against their linked origin, and the figures below were re-checked on this date.
Water heating accounts for roughly 14 to 18 percent of a typical homes total energy use, making it the second-largest energy expense after heating and cooling. For a household with an annual energy bill of $2,400, that is $336 to $432 per year in water heating costs. A few small changes can reduce this by 20 to 40 percent without anyone needing a colder shower.
The changes are mostly habit and adjustment-based, with one or two small purchases that pay for themselves quickly. None of them require replacing the water heater itself.
Lower the water heater setting
The single most impactful change is to lower the temperature setting on your water heater. Most water heaters come from the factory set to 140 degrees Fahrenheit. The U.S. Department of Energy recommends 120 degrees for most homes, which is safe for typical uses, reduces standby losses, and reduces the risk of scalding.
Lowering the setting from 140 to 120 degrees typically reduces water heating costs by 6 to 10 percent. The adjustment takes about thirty seconds. Find the temperature dial on the water heater (usually marked with a thermostat icon or numbers), turn it to 120 degrees, and you are done.
Some households worry about the lower temperature. In practice, 120 degrees is hot enough for dishwashers, washing machines, and showers. For dishwashers without internal heating elements (most modern ones do have them), check the manual to confirm 120 is adequate. For most households, the change is invisible in daily use and visible only on the bill.
Insulate the water heater itself
If your water heater is in an unheated space (basement, garage, utility closet), insulating it with a water heater blanket reduces standby heat loss significantly. Standby loss is the energy the water heater uses to keep stored water hot when no one is using it.
A water heater insulation blanket costs $20 to $30, takes 30 minutes to install, and reduces standby losses by 25 to 45 percent depending on the age and existing insulation of the heater. The payback period is typically less than one year.
Check the manufacturers instructions before insulating. Most modern water heaters can be safely insulated, but some specific models (particularly some gas models with venting requirements) need careful blanket placement. The instructions on the blanket itself usually cover the relevant safety considerations.
Insulate the hot water pipes
The first six feet of hot water pipes leaving the water heater are responsible for most pipe-related heat loss. Insulating these pipes with foam pipe insulation reduces heat loss from the pipes themselves.
Foam pipe insulation costs about $1 per linear foot. The installation is straightforward: slip the foam over the pipe, secure with tape. The whole project for the main runs takes about an hour and produces measurable savings.
For homes with longer hot water pipe runs (water heater far from the main bathroom or kitchen), insulating the entire run produces additional savings and also reduces the wait for hot water at the tap.
Fix any leaks
A leaking hot water faucet is double-expensive: it wastes water and it wastes the energy used to heat that water. A single hot water leak of one drop per second adds up to thousands of gallons of heated water per year, which can add $50 to $200 to annual water and energy bills combined.
Most household hot water leaks are at faucets, where a simple washer replacement (under $5 in parts) usually fixes the problem. Some are at the water heater itself, where a tank or valve replacement may be needed.
A monthly check of all hot water faucets and a visual inspection of the water heater takes five minutes and catches developing leaks before they become significant.
Take shorter showers
Shower length is the single largest household consumer of hot water. Reducing average shower time from ten minutes to seven minutes typically reduces hot water use by 25 to 30 percent.
The reduction does not require timed deprivation. A small bluetooth speaker that plays a favorite three-song playlist (roughly seven minutes) is a more pleasant timer than any clock. The playlist ends, the shower ends, and the household has saved several gallons of heated water without anyone counting minutes.
For households with multiple showering members, the savings compound. A four-person household saving three minutes per shower per day saves roughly 4,000 gallons of heated water per year, which is significant on both the water bill and the energy bill.
Install low-flow showerheads
Modern low-flow showerheads (typically 1.5 to 1.8 gallons per minute, versus the older 2.5 gpm standard) reduce hot water use by 20 to 30 percent. Quality low-flow heads do not feel meaningfully different from higher-flow versions, especially modern designs that use aeration to maintain spray quality.
Cost is typically $20 to $40 for a quality unit. Installation takes ten minutes and requires no plumbing skill. The payback period is usually two to four months in hot water and water savings combined.
If anyone in the household resists the change, frame it as an experiment. Try the new showerhead for two weeks. If no one notices, the savings are permanent. Most households who try this find that the showerhead becomes invisible in daily use.
Use cold water for most laundry
Most modern laundry detergents are formulated for cold water. The exceptions are heavily soiled items, oily stains, and some specific fabric care needs. For most laundry loads, cold water produces equivalent results to hot water.
Switching from hot to cold for the majority of loads typically reduces water heating costs by 5 to 10 percent of the annual total. The savings come from doing nothing different except setting the temperature dial to cold.
For families with young children or with someone in healthcare professions, certain loads still benefit from hot water (cloth diapers, contaminated work clothes). Keep hot water for those specific loads and switch the rest.
Run the dishwasher only when full
Dishwashers use significant amounts of hot water per cycle. Running them only when full reduces the number of cycles per week and proportionally reduces water heating costs.
For households of one or two people, the dishwasher may only fill every two or three days. That is fine. Use the dishwashers built-in rinse setting between loads if needed to prevent food from drying onto dishes.
If your dishwasher has an “energy saving” cycle (sometimes called eco mode), it typically uses less hot water than the standard cycle, with slightly longer wash times. For non-urgent loads, the eco mode is essentially free savings.
Consider a hot water timer
For households with predictable hot water needs (showers in the morning, dishwasher at night), a hot water timer can heat water only during the hours it is needed. The water heater rests during long unused periods.
The timer costs $40 to $80 and installs in series with the water heater. For households with strict predictable schedules, the timer can reduce water heating costs by 10 to 20 percent. For households with irregular hot water demand, the timer produces smaller savings.
This is a more committed investment than the other suggestions and not for every household. For those with regular schedules, the payback is usually under a year.
The honest summary
Water heating costs are highly responsive to small changes. Most households can reduce their water heating bill by 20 to 40 percent through a combination of lower temperature settings, insulation, low-flow fixtures, and small habit shifts. The investment is minimal, the disruption to daily life is essentially zero, and the savings repeat every year.
For pairings, see our pieces on reducing water use and heating bills.
Sources this article draws on
Figures and definitions on this page reference the following authoritative sources for the Utility & Bill Savings category. Where a specific number is quoted, the corresponding source is the one it was checked against.
