How many BTU's does it take to boil a gallon of water?

A BTU (British Thermal Unit) describes the amount of energy to raise 1 lb of water 1 degree Fahrenheit in one hour. Water equals 8.3 lbs per gallon. To boil one gallon of water starting 70°F in 1 hour you will need 8.3 x (212-70) = 1,178.6 BTUs.
A.

How many BTUs does it take to boil one pound of water?

lbs of water x temperature rise = BTUs required for one hour (1 lb of water x 1 degree Fahrenheit) = 1 BTU for 1 hour.
Water equals 8.3 lbs per gallon. To boil one gallon of water starting 70°F in 1 hour you will need 8.3 x (212-70) = 1,178.6 BTUs.
  • Can Steam be hotter than 212 degrees?

    After water changes from a liquid to a gas (at 212 degrees Fahrenheit) it can actually heat up much hotter than that. In the gas form, water molecules are spread out and have a lot of room to move and get much hotter than the other two phases (liquid and ice). And water freezes at 32 degrees Fahrenheit.
  • How many BTU's are in one pound of steam?

    1 pound of steam is equal to 970 BTU (or an easy to remember rule of thumb is 1 pound of steam is equal to 1000 BTU. 1 pound of water is equal to a 16 oz tall boy (by volume)….when you heat that tall boy hot enough to make steam it expands almost 1700 times its original volume.
  • How many Btus does it take to melt a pound of ice?

    It takes about 144 Btu/pound to melt ice, and warming the water from 32 F to say, 72, requires another 40 Btu. Say 200 Btu/lb in round numbers. So each hour of summer AC requires 75 pounds of ice to begin with, ignoring the heat leaks to the ice battery itself.
B.

How many kilowatts does it take to heat a gallon of water?

Energy required to heat one gallon of water, and one tank of water. Heating a gallon of water by 1°F with no losses thus takes 8.33 lbs x 1 Btu/lb = 8.33 Btu's. Heating a gallon of water by 1°F with no losses thus takes 8.33 ÷ 100,000 = 0.00008.33 therms. One kWh is 3413 Btu's, so one Btu is 1/3413 = 0.000293 kWh.
  • How many watts does it take to boil water?

    In electric kettles the water is in direct contact with the heating element, there is no pot to heat and most kettles include an integrated lid. The electric kettle averaged around 1200 watts and took 125 seconds to boil the water, which translates to 0.04 kilowatt-hours (kWh) of electricity consumed.
  • How much does a gallon of water cost utilities?

    This utility uses a uniform rate structure that charges the user $0.00295 per gallon (or roughly 3 cents for every 10 gallons) used during the billing period. The bill also shows a similar facility charge for sewer and a "rate case expense surcharge" to help pay for the utility's rate setting process.
  • How many watts does a freezer use?

    Older freezers will use over 100% more energy than newer Energy Star rated models, a modern freezer will use between 100 and 400 watts of power, with 200 watts on average. Click calculate to find the energy consumption of a standalone freezer using 200 Watts for 24 hours a day @ $0.10 per kWh.
C.

How many BTU's do I need for my hot water heater?

A common input is 34,000 BTUs on a 40-gallon tank and 36,000 BTUs on a 50-gallon tank. The higher the BTU input and efficiency, the faster the recovery. Electric water heaters typically have one 5,500-watt or two 4,500-watt elements.

Updated: 5th September 2018

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