Slant/Fin Sentry (S-34 to S-150)

The Sentry is Slant/Fin's gas cast-iron hot water boiler line, documented on the hub at slantfin.com/library/sentry/ with the official breadcrumb 'Boilers > Sentry' — the active library section. The official IOM (Pub. S-42, P/N 46-0771, 1/19) names the models 'HOT WATER MODELS S-34 THROUGH S-150': S-34, S-60, S-90, S-120 and S-150. Slant/Fin prints no 'current' or 'discontinued' sentence; section placement is the only official status wording, so Boilers.ca describes the line as current library / documents available on slantfin.com without asserting current production.

The IOM prints dimensions and weights only: 2–6 sections, jacket widths from 8⅛" to 20⅛", and full-of-water weights from 190 to 425 lb. There is no per-model input-Btuh or AFUE table in the text — those values live on each unit's rating plate and in the official Energy Guide label PDFs, which are image-only; no OCR was performed and no values were invented, so Boilers.ca keeps the Sentry at series level. The design is Category I natural draft with a 15 ft minimum chimney, a vent damper is allowed, and the control is the Hydrolevel HydroStat 3200-Plus (the hub links the control manual).

The boiler uses intermittent pilot spark ignition on cast-iron sections with a 50 psi MAWP and a 30 psi relief valve, per the IOM. Because ratings are unit-specific, owners and contractors should read the installed unit's rating plate and Energy Guide label against the official IOM. No official Canadian-sales statement was found, so canadianStatus stays 'unknown'; gas, venting and combustion work belongs with a licensed contractor.