Slant/Fin® Sentinel™ 24311211NV SE-70 Hot Water Gas Fired Boiler, Natural Gas Fuel, 50000 Btu/hr Net IBR, 70000 Btu/hr Input, Damper Vent, Cast Iron, Intermittent Ignition

  • AFUE Rating: 82.3 %, 84 %
  • Dimensions: 17-5/8 in W x 19-3/4 in D x 28-7/16 in H, 17-5/8 in W x 19-3/4 in D x 49-3/4 in H
  • DOE Heating Capacity: 58 MBtu/hr, 58000 Btu/hr
  • Flue Outlet Size: 6 in
  • Fuel Type: Natural Gas
  • Input Capacity: 70000 Btu/hr
  • Manufacturer Name: Slant/Fin Corporation
  • Net IBR Rating: 50000 Btu/hr
  • Series: SE Series, SE-70
  • Vent Type: Damper
The Sentinel™ boiler is a hot water gas boiler with a heat exchanger which has for years been a "workhorse" of the heating industry. The Sentinel™ is available for use with propane or natural gas. This boiler is popular with many heating contractors for performance and reliability.
  • Features and More


  • Easy installation and reliable operation that natural draft design provides
  • High performance cast-iron heat exchanger
  • Specially shaped thermal pins promoting efficient heat transfer
  • Assembled with only durable metal push nipples
  • No mechanical combustion aids are required
  • Special port construction will not permit flame to lift or flash back
  • Atmospheric natural draft combustion


  • Residential


  • Taco T007 Pump


  • 2021 DOE Complaint
  • AHRI Certified
  • ASME Specified
  • CSAus Certified
  • ETL Intertek
  • Prop 65: California


  • 25 Years Limited Lifetime