An electric water heater typically costs between $40 and $80 per month to run, or about $480 to $960 annually. Your actual monthly cost will vary based on your local electricity rates, household size, and the type of heater you have.
A typical electric water heater uses 360-450 kWh per month (12-15 kWh daily), costing $50-70 monthly at average 2025 electricity rates. Larger households or inefficient units may use 500+ kWh monthly, while efficient heat pump models use only 120-180 kWh.
A 10-minute shower typically uses 12 to 25 gallons of hot water, depending on your showerhead's flow rate and how hot you keep the water.
If your home uses electricity for central heating, the cost is likely still cheaper than running space heaters. According to Scerbo, “Buying a space heater for every room would increase the electricity bill more than if you had just bumped up the thermostat.”
Electric tankless water heaters do not use a lot of electricity overall, but they require a huge power surge for a very short time. Because they heat water "on demand" rather than keeping a tank hot 24/7, they can actually lower your monthly energy use.
For larger households, multiple showers, laundry, and dishwashing may run at the same time. Hot water demand could reach 10–12+ GPM. A high-capacity tankless water heater—or even two units installed in parallel—may be the best solution.
Water heaters can create high energy bills if they operate inefficiently, consuming more energy to produce the same amount of hot water as a newer, well-maintained unit. Over time, sediment can build up in the tank, reducing its capacity and forcing the heater to work harder and longer to heat the water.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
Assuming the U.S. average cost of electricity of 17.98¢ per kWh (Source: US Average Electricity Cost as of October 2025 per EIA) it will cost you $42 a month to use your space heater. Try this electricity usage calculator to see the electricity usage and cost to run your space heater each month.
Natural gas is usually the cheapest way. Even with higher gas prices, a heating system fueled by natural gas is typically less than electricity, propane, or heating oil. Energy efficiency is another way to assess the cost of a heating system. An energy-efficient heating system saves you money on your heating bill.
The 4-minute shower rule is a sustainability and cost-saving initiative advising people to limit their daily showers to four minutes or less. This practice helps conserve water, reduce energy used for heating, and lower household utility bills by limiting consumption to approximately 36–40 liters (roughly 9.6–10.5 gallons) per shower.
Some common causes of high water bills include:
A bath generally uses more water than a standard 10-minute shower. However, exact usage depends on your bathtub's size and the flow rate of your showerhead.
In most homes, Heating and Cooling (HVAC) systems drive the highest energy costs, accounting for nearly 40% to 50% of your total electricity bill. Following these, the appliances that run up your bill the most include water heaters, refrigerators, and laundry machines.
Plumbers often hesitate to recommend tankless water heaters because they act like high-performance sports cars. Unlike traditional tank models that are "workhorses" and can function while mostly ignored, tankless units require precise installation, regular maintenance, and are highly sensitive to mineral buildup.
Typically, a hot water heater that uses a tank will run for 3 to 5 hours per day. So, a 4,000-watt heater used for 3 hours a day at 10¢ per kWh will cost $1.20 per day, about $36.50 per month, or $438 per year.
Heating and Cooling
HVAC systems are typically the largest driver of energy costs. Running your furnace or AC more often in extreme weather can exponentially increase your monthly bill. These costs can make up more than half of your total electricity bill.
It is almost always cheaper to lower your thermostat when you are away or sleeping than to maintain a constant temperature, according to the Department of Energy.
Unexpected high water bills often stem from hidden leaks or faulty water meters. Start by verifying your water meter readings for accuracy; note any sudden spikes. Inspect all visible pipes, faucets, and toilets for slow leaks or running water. Check the toilet flapper valve and supply line for constant flow.
Heating and cooling (HVAC) systems are the biggest energy consumers in a typical house, accounting for roughly 45−50% of your total electricity usage. Water heaters, refrigerators, and lighting round out the rest of the major draws.
A detailed study from the National Renewable Energy Laboratory found residents preferred a wintertime heater setting between 67 °F and 70 °F (19 °C to 21 °C). The Department of Energy recommends a winter heat setting of 68 °F (20 °C), which matches up very well with the temperatures most of us are comfortable with.
This problem usually comes down to capacity, heat production, or mixing issues inside your plumbing system. Sometimes the fix is simple, like adjusting your water heater temperature or flushing out sediment. Other times you may need a new mixing valve, an element replacement, or a different size water heater.
A faulty water heater might not seem like it could impact your water usage that dramatically, but think again. Whether it's a small leak, sediment issues, or incorrect temperature settings, an inefficient water heater can secretly be hemorrhaging gallons upon gallons without you realizing it.
Average monthly water bill
The average water bill in the U.S. is $49 per month, with most bills falling between $40 and $60 per month. However, monthly water bills range from $15 to $100+, depending on the household size, water usage, and location. A typical family of 4 uses over 300 gallons of water per day.