If you need to purchase an electric water heater, look for models with EF ratings in the 90s. The higher the number the better, with the most efficient models weighing in around. To refine your calculations, consider that how much gas a hot water heater uses depends on its Energy Factor, or EF rating. $224 for gas, you would save $214 per year using gas, although the exact numbers you see would depend on all the other variables in play, such as the efficiency of your unit. Going by the examples given above, where the electric heater costs $438 in fuel vs. Generally speaking, a gas water heater will cost less per month than an electric model, since natural gas prices tend to be lower than the cost of electricity. Your totals come to about $.62 per day, $18.70 per month and $224 per year. 205 therms per hour, for three hours per day, For example, if you pay $1 per therm and use a heater that consumes. The formula for estimating your bill is similar as well: Multiply the therms your heater uses per hour times the number of hours it's on times the price you pay for therms. If you use a gas hot water heater, the same factors affect the cost as with their electric cousins. How Much Gas Does a Hot Water Heater Use? So, a 4,000-watt heater used for three hours a day at $.10 per kWh will cost $1.20 per day, about $36.50 per month, or $438 per year. Typically, a hot water heater that uses a tank will run for three to five hours per day. You can come up with a cost estimate by multiplying the number of watts your heater uses by the price you pay per kWh by the number of hours the heater is active per day, then dividing by 1,000. How Much Electricity Does a Hot Water Heater Use?Įxactly how many watts an electric water heater uses depends on a number of variables, including the age and size of the unit, whether it is a tank or on-demand model, what temperature you set it to, how much hot water you use in a day, and other factors. If you can calculate how much energy you expend heating water, however, you will be armed with the information you need to improve your efficiency and bring your bills down to a minimum. In the average home, the hot water heater is responsible for about 17 percent of the total energy use, according to the Department of Energy. Your water heater is one of the more robust consumers of energy among your home appliances. How Much Energy Does my Water Heater Use?
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