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iHeat AH18 Pro Performer Whole House Tankless Water Heater 18KW

$ 548.00

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Great for 1.5 baths in moderate climates or 2.5 baths warm climates.

The AH series of tankless water heaters have long been known for their durability and reliability. The AH-18 is no exception. Powerful enough to heat water for average size homes in moderate to cold climates it packs a wallop with 18 kilowatts of electrical draw. With a max temp rise of 122.4 degrees F at 1 GPM and 61.2 degrees F at 2 GPM you can see how this tankless water heater will perform very well in most applications and climates. It is perfect for 2 bath homes throughout North America where incoming water temperature is no lower that 55 degrees F.

  • Advanced Digital Temp Control
  • Completely stainless steel housing
  • Incredible heating capacity
  • Saves as much as 60% of your electrical cost to heat water
  • Color coded inlet and outlet for easy installation
  • Small in size and very easy to install
  • Cover: Stainless Steel
  • Body/Heat Exchanger: Stainless Steel
  • Element: 3 Brass Flange/Copper
  • 3 year warranty
Tech Specs 
  • 18 KW at 240V
  • Two 40 AMP Double Pole Breakers Required
  • 8/2 Wire
  • Dimensions: 16” x 13.5” x 3.25”
  • Pipe fittings: 3/4" NPT
  • Shipping Weight: 12 lbs.

Drakken iHeat AH-18 installation diagram.


Ask a Question
  • Does this unit come with a warranty?

    All iHeat brand water heaters feature a 1-year warranty.

  • What size fittings does this unit have?

    The iHeat AH-18 tankless water heater uses 3/4” fittings on both the inlet and outlet, both located on the bottom of the unit.

  • What electrical specifications are required for this unit?

    The iHeat AH-18 tankless water heater runs on 240 volts, and is a two-line heater. It calls for 2 Double Pole 40 amp breakers, and 8/2 wire (8 gauge).

  • How many bathrooms can this unit provide hot water for?

    The iHeat AH-18 tankless water heater is a large capacity unit, with 18KW of heating power and an increased flow rate. This unit is ideal for 2.5 baths in warm climates, and up to 1.5 bathrooms in colder climates.

  • Error message 32 - how to resolve it

    The E32 code is 3 possible codes on the AH18 iHeat heater. Please contact our tech dept for further instructions and resolution on this particular code. 305-823-6991.

  • which device may I add to the tankless heater circuit to limit wasting water before reaching the hot temperature ? is a thermal by-pass valve enough?

    That's not possible water must flow thru the heater in order for the heater to activate. Once it activates you have lag time which is the time it takes to push out the cold water in your hot line until the hot water reaches the the fuacet in use. Lag time varies contingent upon the feet of travel from heater to faucet. The closer the faucet the lower the lag time and vise versa. Hope this helps you.

  • What is the ACV valve in the diagram? It does not seem to be part of the kit we recieved.

    The ACV is not included in any of the kits. The ACV is used only when customer is on well water without a bladder.