Sentinel Boiler - Slantfin

Fuel: Gas
System: Hot Water
Combustion: Natural Draft, atmospheric
Capacity: 5 sizes, 70 – 210 MBH Input
Efficiency: up to AFUE 82.3%

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.

All Sentinel boilers are DOE 2021 compliant.

Fuel: Gas
System: Hot Water
Natural Draft, Atmospheric
Capacity: 70 - 210 MBH
Up to 82.3% AFUE
Easy installation and reliable operation that natural draft design provides
Intermittent ignition
High performance cast-iron heat exchanger
Specially shaped thermal pins promoting efficient heat transfer
All Sentinel boilers DOE 2021 compliant
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
25 Year Limited Lifetime Warranty

The boiler heats quickly, sending warmth to radiators throughout your home within moments of your thermostat's call for heat. When the Sentinel boiler is operating, combustion air enters the boiler and exhaust is expelled up the chimney by natural draft. No mechanical combustion aids are required for the boiler to attain its high efficiency. With fewer components, there's less chance of losing your heat because of part failure.

The Metal Push used will expand and contract with the individual boiler sections that they connect which avoid leaks.

Product Literature

Sentinel-Catalog-Sheet-718

Technical Resources

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