FREE shipping on orders over $199! Restrictions apply. See details

Intellihot iQ251 Gen II - i Series - Tankless Water Heating Systems

iQ251 Gen II
Intellihot iQ251 Gen II - i Series - Tankless Water Heating Systems

Intellihot iQ251 Gen II - i Series - Tankless Water Heating Systems   

With 96% thermal efficiency and flexible design and circuit options, iQ251 and iQ251D models are the best-in-class wall-hung, ASME-compliant, tankless water heaters. These wall-hung iQ models are constructed for maximum durability and the most demanding commercial and industrial applications. The iQ251D is the only gas-fired, deionized on-demand water heater on the market. Both iQ251 and iQ251D deliver 251,000 BTU/hr


  • Wi-Fi & Cellular Connectivity - Real-time monitoring of your Gen II unit is available through the unit's 3.5" touch-screen - and accessible remotely via a mobile app. Each unit can be easily connected to your building's Wi-Fi router or Intellihot's internet hub. 

  • Masterless Cascading- Eliminate single-point failure with our patented Masterless Cascading technology. If one cascaded unit is offline for servicing, all other units regroup and continue to operate. Cascade up to 2,510,000 BTu/hour (10 units) for larger applications. 

  • Eliminate Mixing Valves & Lower Legionella Risks- With no storage tanks, there's a lower risk for Legionella growth. By eliminating the need for mixing valves, these features also reduce their associated unreliability and costs. 

  • Full Modulation - Smart units deliver maximum BTU/hr input when needed and zero BTU/hr the rest of the time

  • Gas-Fired - By using natural gas our system lower operating costs and improve ROI vs. electric water heaters. 73KW of heating capacity available with low-pressure drop; capable of 9.6 GPM at 50F temperature rise.

  • Common Venting Capabilities - The iQ251 and iQ251D units transform common venting into smart-common venting. 

  • ASME-HLW Compliant - Suitable for applications managed by engineers, specifiers, and contractors. 


  • Minimum Input (BTU/hr) - 30,000

  • Maximum Input (BTU/hr) - 251,000

  • Maximum Output (BTU/hr) - 240,960

  • Thermal Efficiency - 96%

  • Dimensions H x W x D (inches) - 26.2 x 17.7 x 15

  • Weight (LBS) - 93 LBS 

  • Water Pressure Min/Max (PSI) - 30/160

  • Vent Size (Diameter) - 3"

  • NG/LP- (Maximum Static Gas Pressure Range) - 2.5" - 14" WC

  • Electrical (120V AC, 60Hz) - 120V AC, 60Hz

File Downloads

(Size: 8.5 MB)
(for all Gen II units)
More Information
SKU iQ251 Gen II
MPN iQ251 Gen II
Weight 125.000000
Manufacturer Intellihot
UPC 850007779641
Generic Product Category Tankless Water Heater
Voltage 120V
Write Your Own Review
You're reviewing:Intellihot iQ251 Gen II - i Series - Tankless Water Heating Systems
Your Rating

We found other items that you may like

© 2024 LCP Holdings Inc