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Gas water heaters have the right to be one effective means of keeping a home supplied with hot water. The energy prices from electrical water heaters have the right to be substantially greater in part areas, and also these units room susceptible to strength outages, if natural-draft gas water heaters are not.

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


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

BTU


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A British heat unit (BTU) is the lot of power needed come raise the temperature that one pound of water by one level Fahrenheit at normal atmospheric pressure. BTUs are provided as one expression of energy consumption for the purpose of comparisons in between different fuels.

Tank Size and Thermostat Setting


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at 62 levels Fahrenheit, one gallon the 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 about a half 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 minute to warmth the tank if all heat is transferred to the water.


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If the energy efficiency of the water heater is rated at 80 percent, climate 20 percent that the heat from the burners is escaping the end of the chimney. Therefore, the moment to reheat a 40-gallon water heater in ~ 40,000 BTUs is augmented to around 36 minutes.

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Age the the Water Heater


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The efficiency of the burner can be limited by the problem of the unit and build-up 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 quantity of warm that is moved to the water is reduced, therefore increasing the quantity of time essential to warmth the water.


The Drip Cap

Gas water heaters have the right to be one effective way of keeping a residence supplied with hot water. If the thermostat is collection to 122 degrees Fahrenheit, it would certainly take about 30 minute to warm the tank if all heat is transferred to the water. If the flame is no as hot due to incorrect air come gas ratios, or over there is a accumulation of calcium and lime in the tank, the quantity of warmth that is transferred to the water is reduced, hence increasing the amount of time vital to warm the water.

Eric Jonas has been writing in small-business advertising and local ar newsletters due to the fact that 1998. Prior to his creating career, he became a licensed level II gas technician and also continues to occupational in the field, likewise authoring educational newsletters for others in the business. Jonas is at this time a graduate student with a Bachelor of art in English and rhetoric indigenous McMaster University.


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