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S
ENTINE
L
™
High efficiency, cast-iron gas boiler
Reliable natural draft design
The Sentinel boiler’s S-Series heat exchanger
has for years been a “workhorse” of the heating
industry, in boilers chosen by heating contrac-
tors for performance and reliability. It’s made of
quality cast-iron and assembled with durable
metal push nipples. Specially shaped thermal
pins promote efficient heat transfer. The boiler
heats quickly, sending warmth to radiators
throughout your home within moments of your
thermostat’s call for heat. The Sentinel boiler is
so reliable it comes with a lifetime limited
warranty.
High performance heating
When the Sentinel boiler is operating, combus-
tion 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. Nor does it require the
copper fin tubes, water bypass valves or con-
densing technologies utilized by some other
high-efficiency boilers. With fewer components,
there’s less chance of losing your heat because
of part failure.
Intermittent ignition or
standing pilot models
Enjoy the easy installation and reliable operation
that natural draft design provides, plus high
efficiency too. With a choice of intermittent pilot
ignition or standing pilot, Sentinel’s AFUE’s
range from 81.5% to 82.3%.
• AGA input: 70,000 to 245,000 Btu/hr
• Standing pilot or intermittent ignition
• Saves energy. A.F.U.E. to 82.3%
The smarter choice for informed homeowners.
Enjoy home heating comfort with the extra confidence that an advanced design Sentinel boiler pro-
vides. The Sentinel boiler combines the reliability of natural draft and cast-iron construction with the
high efficiency performance provided by the Slant/Fin S-Series heat exchanger. A new Sentinel boiler
can save 30% or more on fuel bills compared to a
typical old boiler operating at 60% efficiency.
A new advanced design Sentinel
boiler will provide years of reliable,
economical home heating comfort.