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Note: All prices in US Dollars
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Many people are disappointed in the results of their first tankless heater installation. If looking at the price or picture makes your decision then you are not ready for tankless water heating. The following exercise shows a simple formula to determine the exact size of tankless in kilowatts that you need. Understand the math and physics behind heating hot water on an instantaneous basis and you will not be disappointed.
 Still don't know what to buy? If you know how many gallons per minute you need with the chart supplied for the various applications in your home, then use the following simple formula: * Heat Rise X 147 X GPM / 1000 =Tankless unit needed in Kilowatts Heat Rise = Temperature of your incoming water minus the temperature of hot water needed 147 = watts of power to raise one gallon of water one degree Farenheit GPM = Gallons per Minute Divide the Products of these numbers by 1000 For example, if you have 65 degree water and you want 105 degree water then the heat rise needed is 40 degrees. Multiply 40 times 147 and then multiply by the number of gallons per minute you need. Use, say, 3 GPM for a nice flow for a regular tub faucet. Divide these numbers by 1000. In this case, 40 X 147 X 3 / 1000 = 17.64 Now that number rounded up is 18 kilowatts. In this case you could use a piggy-back or in-tandem, two ADK units. One as a pre-warm such as the ADK-7 (6.4 kW) hooked up to a standard ADK-12 (11.8 kW) to supply the power needed. Or, you could consider using the next series of stainless steel heaters by choosing an AHS-18D unit. Note that if you need 18 kilowatts of power and you buy one 11.8 kilowatt ADK-12 unit then you may come up short of hot water on those cold Winter days. Use the Following Links to Size Your Tankless
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