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12 Total Reviews /files//4-seasons-logo.jpg715-693-6723$1234 Old Hwy 51, Kronenwetter WI

High Efficiency Comfort

SB Series Commercial Condensing Boilers

Its intelligent water channeling facilitates the condensation process and created even greater energy efficiency (up to 98%). The SB615 utilizes standard US burners and conventional controls and is a perfect match with thermostream boilers in multiple boiler systems. The SB615 and the SB735 are constructed with stainless steel fire tubes and a full three-pass flue design extracts latent heating and maximizes overall efficiency. Its simplified system design eliminates the need for dedicated boiler pumps, bypass and or shunt pumps.

  • Ultra High Efficiency - Up to 98%
  • No Restriction on Return Temperature and Flow Rates
  • Stainless Steel Hydro-Formed Fire Tubes for Long Life
  • Dual Returns Provide Unique Design Opportunities
  • Suitable for Natural Gas or Liquid Propane Forced Draft Burners
  • Low NOx and CO Levels, Meeting Air Quality Control Regulations
  • 484 to 4,079 MBH Output
  • Simple design eliminates the need for dedicated boiler pumps, bypass or shut pumps
  • Perfect match for Thermostream boilers in multiple boiler systems
MODELInput MBtuHOutput MBtuHNet IBR MBtuHHPCombustion Eff.Water Content Gal.Dimensions HxWxDDry Weight
SB615-240835.0 791.0 688.0 23.6 96.5 179.0 55.5 x 38.25 x 70 1950
SB615-3101080.0 1022.0 889.0 30.5 96.4 171.0 55.5 x 38.25 x 70 2030
SB615-4001393.0 1317.0 1145.0 39.3 96.3 180.0 63.5 x 38.25 x 70 2600
SB615-5101776.0 1678.0 1459.0 50.1 96.2 229.0 69.75 x 43.25 x 75.25 2970
SB615-6402228.0 2104.0 1830.0 62.8 96.2 223.0 69.75 x 43.25 x 75.25 3020
SB735-7902751.0 2650.0 2265.0 77.8 94.7 494.0 81.25 x 54 x 91.25 3811
SB735-9703378.0 3251.0 2827.0 97.0 95.6 660.0 81.25 x 54 x 108.25 4780
SB735-12004179.0 4079.0 3547.0 121.8 96.5 668.0 81.25 x 54 x 108.25 4855
SB615-145506.0 484.0 421.0 14.4 97.1 148.0 54.25 x 35.5 x 68.75 1690
SB615-185644.0 612.0 532.0 18.2 96.7 147.0 54.25 x 35.5 x 68.75 170

Warranty Information

  • Heat Exchanger for 120 months -
  • All Parts for 12 months -

Available Documents