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Gas water heaters have the right to be an effective method of keeping a home supplied with warm water. The energy expenses from electric water heaters can be substantially greater in some areas, and these units space susceptible to power outages, when natural-draft gas water heaters are not.

You are watching: How long does it take to heat up a water heater


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Calculating how quickly a gas water heater deserve to raise the water’s temperature requires a small bit of mathematics work.

BTU


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A British thermal unit (BTU) is the quantity of power needed come raise the temperature the one pound of water through one degree Fahrenheit at common atmospheric pressure. BTUs are used as one expression that energy intake for the objective of comparisons in between different fuels.

Tank Size and Thermostat Setting


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in ~ 62 degrees Fahrenheit, one gallon of water weighs 8.338 pounds. At this temperature, a 40-gallon water heater would have 333.52 pounds of water. If the water heater supplied 40,000 BTUs per hour, it would certainly take around a fifty percent of one minute come raise the temperature in the tank one degree. If the thermostat is set to 122 levels Fahrenheit, it would certainly take roughly 30 minutes to warmth the tank if all warm is moved to the water.


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If the energy performance of the water heater is rated at 80 percent, then 20 percent the the warm from the burners is escaping the end of the chimney. Therefore, the time to reheat a 40-gallon water heater at 40,000 BTUs is augmented to roughly 36 minutes.

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Age that the Water Heater


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The efficiency of the burner have the right to be restricted by the problem of the unit and accumulation within the tank. If the flame is no as hot due to incorrect air come gas ratios, or there is a buildup of calcium and also lime in the tank, the lot of warm that is transferred to the water is reduced, thus increasing the amount of time essential to warmth the water.


The Drip Cap

Gas water heaters can be an effective means of maintaining a residence supplied with hot water. If the thermostat is set to 122 degrees Fahrenheit, it would certainly take about 30 minute to heat the tank if all heat is moved to the water. If the flame is no as hot because of incorrect air come gas ratios, or over there is a build-up of calcium and also lime in the tank, the amount of heat that is moved to the water is reduced, thus increasing the amount of time necessary to warm the water.

Eric Jonas has been writing in small-business advertising and also local neighborhood newsletters since 1998. Prior to his writing career, he ended up being a licensed level II gas technician and also continues to occupational in the field, also authoring education newsletters for others in the business. Jonas is at this time a graduate student with a Bachelor of art in English and rhetoric native McMaster University.


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