Tankless Heater USA
This Maybe the Last Water Heater You Will Ever Buy!
AHS Model Products
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
AHS Tankless Features
Use a Siemens Subpanel and appropriate Siemens breakers for use with your new tankless heater. Call us at 877-229-1191 to order
We also suggest using a Sediment Filter / Descaler Kit to protect your new tankless from debris, sand and any metal particles that you normally find in water supplies. The manufacturer also recommends this in their Installation Manual. This can be purchase directly from us and shipped with your new unit. Call us at 877-229-1191
* Heat Rise X 147 X GPM / 1000 = Tankless Heater Sized 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
Put your calculator to the test...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 bathtub 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 tandem two Magnum ADK units. One as a pre-warm such as the Magnum ADK M-7 (6.4 kW) hooked up to a standard Magnum ADK M-12 (12 kW) to supply the power needed. Or, you could consider using the next series of heaters by choosing an iHeat AHS18D unit. Note that if you need 18 kilowatts of power and you buy only a 12 kilowatt unit then you may come up short on those cold Winter days. Our iHeat AHS Models we offer range from 11 kilowatts to 27 kilowatts in power. All use 208/220/240 Volts. If you want to compare other tankless water heaters then look for one that is rated 240 Volts and the kilowatt size you need. This formula is simply using the laws of physics of heating hot water on an instantaneous basis. The kilowatt size of an electronic tankless water heater is what you look for when comparing tankless heaters. All tankless water heaters are the same in the end...they heat water. You need to know what size unit you need everytime though or suffer in the winter with less hot water! And, if you like the convenience of pushbutton control in selecting your hot water temperature, then consider our iHeat AHS Models.