Water Heater Btu Per Hour

A water heater is ranked by btu input but really means btus hr.

Water heater btu per hour. Thus a 33 000 btu heater can heat 33 000 pounds of water by one degree in an hour. Average input ratings for a gas water heater range from around 30 000 to 180 000 btus depending on size. A btu is a relatively small amount of energy. This allows multiple showers at once.

Multiply the wattage of your unit by 3 41 per watt to calculate btu. A standard 1 500 watt electric heater produces 5 115 1 500 times 3 41 btu per hour. Another label on the water heater should reveal its first hour rating fhr number this indicates how much hot water the heater can supply per hour at peak usage. The minimum fhr to select for your home will depend on the number of bathrooms and residents it has.

Because btus are measured per hour the 500 comes from one gallon of water that weighs 8 33 pounds times 60 minutes in one hour. However newer tankless units can support up to 9 8 gallons of water per minute simultaneously. Hot water on demand. This gives the amount of energy required to heat the water assuming a 100 efficient heater.

8 33 pounds x 60 minutes 500 the second piece of the formula and sometimes the hardest to identify is flow rate in gpm or the system gallons per minute. Not ideal for everyone. About equivalent to the heat generated by striking 1 stick match. The btu multiplier in the formula is 500.

Or 330 pounds by 100 degrees. Since btu ratings on heaters are per hour multiply by 60 60 minutes in an hour for btu s per hour per gallon per minute. Electric water heaters range in. The more btus the faster the unit will heat water.

They provide a limited amount of hot water per minute. Compare this with a different model pellet stove that has an input rating of 45 000 btu and an efficiency of 85. Move 1 gallon per minute then you need 8 34 btu s per gallon per minute. Offer a limited amount of hot water per minute.