Water Heater Gpm Calculator

Btu flow rate in gpm of water x temperature leaving process temperature entering process x 500 4 formula changes with fluids others than straight water.

Water heater gpm calculator. Any shower head installed after 1992 probably has the flow rate etched into the showerhead. Btu calculator for weighed water test. Accurately measure the water temperature entering and exiting your process. Use this formula to calculate btu cooling required.

The lowest price you can get for the highest gpm is easily the takagi t h3 dv n that will give you a whopping 10 gpm. All pros listed are independent dealer owned. The calculators use the specific heat capacity of water of 4186 j kg c joules per kilogram per degree celsius. To reduce flow rates install low flow water fixtures.

Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. The flow rate through the demand water heater would need to be at least 3 26 gallons per minute. Rise x 1 0 btu hr. This is just a way of measuring how many gallons of hot water could run through the fixture per minute.

Pro size is intended to assist in selecting water heaters or boilers that best meet the specific job requirements. Calculate your family s first hour water heater rating by multiplying the average water use in gallons per minute for each fixture used during the single busiest hour of water usage in your home. Since tankless water heaters supply endless hot water you don t have to worry about capacity but instead think in terms of water flow rate. Rise x 1 0 btu input gph x 8 25 x temp.

Gallons per minute gpm is the key when it comes to sizing tankless water heaters. For practical purposes it should be precise enough. Input specific heat btu output gph x 8 25 lbs gal. The heat capacity is largely constant in the temperature range that the calculators work 34 210 f or 1 99 c.

Rheem manufacturing ranks as the global leader in the manufacture of high quality sustainable and innovative water heaters tankless water heaters air conditioners furnaces pool heaters and hvac systems for residential and commercial applications and is a full member of ahri the air conditioning heating refrigeration institute. It is the sole responsibility of the system designer to select the correct products needed for the specific application. Smith pro size sizing program is a tool that can be used to estimate water heater requirements for many common applications. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home.

Calculate how many gpm for your tankless water heater you can calculate your own maximum gpm by adding up the flow rate of each individual fixture that uses hot water in your home. It is the way it is taught at school.