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The map in this illustration gives a general idea of the incoming water temperatures throughout the United States. It is important to research out your area and get the coldest known water temperature expected in the winter for computing your hot water needs. Three choices you must make in selecting a tankless hot water heater for your home or business:
Use the Heat Rise/Flow Rate Chart to help get a general idea of the size unit required. Use the coldest water temperature known for your area in the Winter. Also, consider using a desired flow rate of around 3 gallons per minute (GPM). A more powerful unit will offer more heat thus more flow rate for your home.
Model Selection Guide
*It is important to consider sizing your Bathtub Faucet as the primary fixture in your home when choosing a tankless water heater. If you plan on using your bathtub then a minimum of 3.0 GPM should be used with a standard tub and faucet. Measure the flow in gallons per minute for your bathtub faucet. If you have a pressure balanced tub faucet/shower valve then a minimum of 3.0 GPM and the advice of a plumber is advised. Showers normally use between 1.5 to 2.5 gallon per minute...hot and cold water. If you need help with this then e-mail or contact us through our Contact Page on this site.
Temperature Rise Chart
Determine your flow rate in gallons per minute. Use the corresponding temperature rise chart to select the ADK Series model using water temperature that will occur in your location in the coldest part of the year. Dependent on your location, temperature of your incoming water and the flow rate required, you may need more than one tankless water heater. Tankless water heaters can be put in service in a variety of configurations including point of use, in tandem, in parallel or you can choose to upgrade to a larger kilowatt unit such as our AH Models. Electrical Specifications on Each Model
This unit can be ordered at this power on our order page. Used in condos and apartments and small homes where power is a concern or issue. Still don't know what to buy? If you know how many gallons per minute you need with the chart supplied for the various items in your home then use the following simple formula: * Heat Rise X 147 X GPM / 1000 = Tankless in Kilowatts needed 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, 40X147X3/1000=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-3 (6.4 kW) hooked up to a standard ADK-1 (11.8 kW) to supply the power needed. Or, you could consider using the next series of heaters by choosing an AH18 unit. Note that if you need 18 kilowatts of power and you buy an 11.8 kilowatt unit then you may come up short on those cold Winter days.
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Note: All prices in US Dollars
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MyTankless@aol.com |
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