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iHeat AHS Models using Self-Regulating Technology
AHS Model Products

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:

  • Incoming Water Temperature
  • Maximum Flow Rate Required
  • Electrical Service

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 iHeat AHS Model will offer more heat thus more flow rate for your home. 

Flow Rate Chart for Household Fixtures using hot and cold water:
Application                   Flow Rate in GPM at 60 PSI
Shower  1.5 to 2.0 GPM (Max 2.5 GPM)
Typical Bath Tub Faucet 2.0 to 4.0 GPM
Pressure Balanced Bathtub Faucet 3.0 GPM Minimum
Bathroom Vanity Sink Faucet       0.5 to 1.5 GPM
Kitchen Faucet 1.0 to 2.2 GPM
Washing Machine 1.5 to 3.0 GPM

AHS Installation Manual  Print a Copy
AHS Tankless Features

AHS Tankless Features

  • Brushed Stainless Steel Cabinet
  • Stainless Steel Water Carrying Components
  • Warranty:  Limited Lifetime on the Heat Exchanger, Three Year on Electrical (Excluding Elements) and One year on the Heating Elements
  • Auto Resettable Thermostats
  • Surge Suppression to protect the PC Board/Computer
  • Replaceable Parts Offering years of service
  • Save up to 50% of your dollars spent heating hot water in the old fashion way
  • Self-Regulating Technology offers temperature setting with the push of a button
  • Small in size...Up to 16" X 17" X 4" in dimension
  • Installation Manual and Instructions
  • Warranty Information

Model

KW @ 240V

Req. Breaker

Voltage

Max Power

Wire Gauge

AHS-27D

27

125 AMP

208/220/240

112.5 AMPS

#2/2*

AHS-24D

24

100 AMP

208/220/240

100 AMPS

#2/2*

AHS-21D

21

100 AMP

208/220/240

87.5 AMPS

#2/2*

AHS-18D

18

80 AMP

208/220/240

75.0 AMPS

#4/2

AHS-16D

16

70 AMP

208/220/240

66.0 AMPS

#4/2

We recommend a sub-panel for easy electrical hookup

Click Here for more information

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

TEMPERATURE RISE IN Fº in GPM (gallons per minute)

Flow Rate in Gallons/Min

1.0 GPM

1.5 GPM

2.0 GPM

2.5 GPM

3.0 GPM

3.5 GPM

4.0 GPM

AHS-27D

183.6

122.4

91.8

73.4

61.2

52.4

45.9

AHS-24D

163.2

108.8

81.6

65.2

54.4

46.6

40.8

AHS-21D

142.8

95.2

71.4

57.1

47.6

40.8

35.7

AHS-18D

122.4

81.6

61.2

48.9

40.8

34.9

30.6

AHS-16D

108.8

72.5

54.4

43.5

36.2

31.0

27.2

 Model Selector

Inlet Temperature

40 Fº

45Fº

50Fº

55Fº

60Fº

65Fº

70Fº

75Fº

80Fº

In Gallons/Minute

GPM

GPM

GPM

GPM

GPM

GPM

GPM

GPM

GPM

Model AHS-27D

2.8

3.1

3.3

3.7

4.1

4.8

5.2

6.1

7.3

Model AHS-24D

2.5

2.7

3.0

3.3

3.8

4.1

4.7

5.4

6.5

Model AHS-21D

2.3

2.5

2.7

3.0

3.3

3.8

4.3

5.0

6.0

Model AHS-18D

1.9

2.0

2.2

2.4

2.7

3.1

3.5

4.1

4.9

Model AHS-16D

1.7

1.8

2.0

2.2

2.4

2.7

3.1

3.8

4.4

Typical Flow Rates in Most Middle American Homes

          APPLICATIONS in Homes             

         FLOW RATE IN GPM At 60 PSI       

Typical Shower

1.5 to 2.5 GPM

Typical Standard Tub Faucet 2.0 to 3.0 GPM
Bathroom Vanity Faucet 0.5 to 1.5 GPM
Kitchen Sink Faucet 1.5 to 2.5 GPM
Clothes Washer 1.5 to 3.0 GPM




















How Big of a iHeat AHS Model Tankless do You Need?  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 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.


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