iHEAT, Electric Tankless Water Heater, Model AHS21D, 21 KW - 240 Volts - 87.5 Amps

  • $489.99
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The iHEAT, Electric Tankless Water Heater, Model AHS21D, 21 KW - 240 Volts - 87.5 Amps, 4.2 GPM. It is known to be the most reliable and easy to operate tankless water heater. The AHS21D can supply enough hot water for homes up to 3 1/2 Bathrooms in the warmer climate areas with water inlet temperatures above 70 °F, as long as the consumption does not exceed 4.2 GMP. In moderate weather these values can vary according to the conditions and installation of the Water Heater. (view attachments)

iheat ahsd electric tankless water heater choosing correct - ikkymart.com

iheat ahsd inlet temperature rise - ikkymart.com 


  • Studios
  • Apartments
  • Pool House
  • 3 1/2 Bathroom in the warmer climates
  • Hospitals
  • Multi-family
  • Commercial


Model AHS21D
Design Real Time Modulation
Current Single Phase 60/50 Hz
Power / Current / Voltage 21 KW / 240 V / 87.5 A

Rec Breaker GFCI

100 Amps (Disconnect 3x40 amps)
Recommended wire size AWG#  #2 (After the Disconnect 3 Set #8)
Min Activation flow rate 0.25 GPM
Weight 22 lbs.
Dims (Height/Width/Depth) in/(cm) 17" / 16" / 3.5"
Max PSI 150 PSI
Water Connections 3/4" COMP
Water Proof IXP4
Enclosure Powder Coated Steel

Installation Schematic

iheat ahs27d installation schematic - ikkymart.com


IMPORTANT: This product must be installed by a qualified contractor in accordance with all State, and Local building codes.


  •  New Digital display with Celsius & Fahrenheit options.
  •  Heat Exchangers to avoid corrosion
  •  Easy grip fittings on inlet and outlet for ease of installation
  •  New flow technology
  •  Advanced Power Modulation through Micro-Processor
  •  Fire Proof Steel Enclosure


  •  Save up to 60% on Hot water heating cost
  •  Save Valuable Space
  •  No tank needed
  •  Small enough to be installed anywhere hot water is needed
  •  NO VENTING needed
  •  Endless Supply of Hot Water!


• 5 Years Leaking of the internal tanks.
• 3 Years Electronic Components.
• 1 Year Heating Elements.

Note: This warranty is with The Manufacturer.


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