How much hot water does a gas water heater use?
Storage VS Input: 90 gallons two hour peak hot water usage -35 gallons of hot water from storage tank 55 gallons of hot water to be produced by heat input during two hour peak. This means 27.5 gallons of hot water per hour must be provided by heat input at the accepted temperature rise used in the locale. GAS WATER HEATER SELECTION
How to calculate the heat of a gallon of water?
One watt-hour of electricity produces 3.413 Btu. This is the formula for determining the Btu required to heat a given quantity of water a certain number of de- grees: Gallons x 8.25 x 1.0 x temp. rise = Btu Where..gallons =Total gallons of hot water required 8.25 = Weight of one gallon of water 1.0 = Specific heat of water (See Specific heat) Temp.
How to calculate the BTU needed to heat water?
This is the formula for determining the Btu required to heat a given quantity of water a certain number of de- grees: Gallons x 8.25 x 1.0 x temp. rise = Btu Where..gallons =Total gallons of hot water required 8.25 = Weight of one gallon of water 1.0 = Specific heat of water (See Specific heat) Temp.
How much heat does a gas water heater produce?
From the gas water heater recovery table it is found that, at 90° temperature rise, 27,225 Btuh will produce 27.5 GPH. An A. O. Smith gas water heater with at least a 50 gallon storage tank and at least 27,225 Btuh input is required to meet the peak usage requirements. Consult A. O. Smith water heater specification sheets to determine model needed.
How many gallons of hot water are in a 40 gallon heater?
When using storage type heaters it is common practice to assume 70% of the storage capacity of the heater tank may be drawn before dilution by incoming cold wa- ter lowers the hot water temperature below an accept- able level under normal draw conditions. For example, a 40 gallon storage tank would deliver about 28 gallons of usable hot water.
One watt-hour of electricity produces 3.413 Btu. This is the formula for determining the Btu required to heat a given quantity of water a certain number of de- grees: Gallons x 8.25 x 1.0 x temp. rise = Btu Where..gallons =Total gallons of hot water required 8.25 = Weight of one gallon of water 1.0 = Specific heat of water (See Specific heat) Temp.
How big of a gas tank do you need for a water heater?
An A. O. Smith gas water heater with at least a 50 gallon storage tank and at least 27,225 Btuh input is required to meet the peak usage requirements. Consult A. O. Smith water heater specification sheets to determine model needed. ELECTRIC WATER HEATER SELECTION NOTE: In the following example the fuel used is elec- tricity instead of gas.