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To heat one pound of water one degree Fahrenheit requires one Btu, short for British heat unit. Countless heating costs and also capacities, including water, are calculated in Btu. By learning Btu consumption, homeowners have the right to determine which form of warm water heater suits their needs best, such together an on-demand heater or one through a large storage tank. If you carry out not know what the Btu intake is on your current water heater, friend can discover it as long as you recognize the capacity of your water heater.

You are watching: How many btu to raise water 1 degree


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Step 1

discover the capacity of her water heater by looking in ~ the appliance because that information about it. Usually, over there is a label on the former of the heater that offers pertinent data about the heater, including capacity. This label may be stamped on metal or published on a sticker, relying on the age of the unit.

Step 2

Assemble water info for the equation. That takes one Btu per lb of water to raise the temperature through one level Fahrenheit. The standard dimension of American hot water heaters is 40 gallons, and each gallon of water weighs 8.33 pounds.

Step 3

Calculate the Btu. If you have actually a 40-gallon water heater, that is 40 multiply by 8.33, or 333.2 pounds that water. So you need 333.2 Btu to raise the water 1 level Fahrenheit. However, most areas need an ext than one degree of heat included to the water to make it warm enough for showering or washing garments or dishes. Now an ext information is needed.


Step 4

Get the median temperature of her water. This details is usually easily accessible from your water agency or municipality. For instance, if her water temperature is 50 degrees Fahrenheit top top average, and you desire it in ~ 140 degrees in the water heater, subtract 50 native 140. This is just how much greater the water demands to it is in heated. Take the number (90) and multiply the by 8.33, causing 749.7. Multiply the by 40, the number of gallons in the tank. This answer is 29,988, which means you need 29,988 Btu.

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Altitude can additionally be a variable in heater water. When water boils at 212 degrees Fahrenheit at sea level, that boils at 186 levels at 14,000 feet above sea level.

Elizabeth Sobiski has been writing professionally because 2005. She offers businesses such together Burdick and Lee Galleries, Clearwater Fishing Charters and Read Finder through custom content to keep their digital and print media fresh, informative and directed to their target audience. Sobiski stop a Bachelor of arts in English indigenous Roosevelt university in Chicago.