The flow rate is a critical factor in sizing a tank less water heater. The Federal Energy Policy Act of 1992 required all faucets in the US to be no more than 2.2 Gallons per Minute or 60 P.S.I. Therefore it is imperative that you know how to calculate the G.P.M. with inline water heaters.
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It is best that you manually measure the flow rate of each faucet and shower heads in the household where a water heating device is installed. To do this, you place a container to collect the water, and then turn the faucet on to its normal position for ten seconds. Then you measure it and convert the measurement to gallons. Then multiply the measure quantity of water by 6 to calculate the flow rate in gallons per minute.
Conversely, the Gallons per Minute water rating depend mainly on the number of fixtures that has a water heater. To get the maximum flow rate, you add all the flow rate of all fixtures with a tank less heater at your home.
The rating of tank less type of heaters what will also depend on the location due to the temperature of groundwater. If the ground water is too cold than an ideal place, then it will need more heat to get the desired water temperature. If your temperature needs to rise up to 80 °F and your maximum Gallon per Minute is 7, then you need a tank less heater for 6 Gallon per minute at 80 °F.
To be compliant of the Federal Energy Policy, what needs to be done is to install fixtures that have a low flow rate and also to choose the right water heating device that fits your household's needs. It is advisable to have a consultation with an experienced plumber to be able to size your water heating device accurately.
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