Commercial iQ Series

Models iQ251, iQ751, iQ1001, iQ1501

Our iQ Series delivers the ultimate in water-heating capacity. These high-input units are designed for very-large-volume applications using potable hot water. Looking to conserve floor space? Install the wall-hung iQ251 heaters. Looking for the most powerful solution possible? Team together four freestanding iQ1501 units to create a 6 million Btu/h system. Imagine what you can do with 160 GPM at 70°F rise, 24/7/365? The configuration possibilities are endless, and the performance is second to none.


Instead of sizing a water-heating system and then adding redundancy, you now have a far better option: Our iQ series incorporates built-in redundancy, completely eliminating the need for oversizing. For example, each iQ1501 unit includes six independent heat engines that operate as an integrated system. If any one of the six internal modules experiences a malfunction, the remaining five will continue to operate—providing 83% of the original capacity.

  • 251,000 to 1,501,000 Btu/h for large commercial facilities
  • 98 percent condensing combustion efficiency minimizes operating costs, ensures green operation
  • The industry’s leading turndown ratio (50:1 on the iQ1501) for unparalleled gas savings
  • Cycle-proof and stress-resistant for maximum durability
  • Down-fired, premixed burner for extended life and low maintenance
  • Negative pressure gas valve allows low 2.5″ WC static operation
  • Full modulation delivers maximum Btu/h input when needed and zero Btu/h the rest of the time
  • Connects to common venting
  • ASME-HLW Compliant


  • Restaurants
  • Car washes
  • Commercial kitchens
  • Hotels
  • Fast-food restaurants

iQ751 | iQ1001| iQ1501:

  • Schools
  • Large apartment complexes
  • Stadiums
  • Hospitals
  • Large hotels

Before and After