Carrier Carrier BS2 (Comfort 80 gas boiler)

The BS2 is the Comfort 80 gas boiler on Carrier's current US boilers page, described as a durable, efficient model with a cast iron heat exchanger, single-stage gas valve and electronic ignition, rated up to 82.7% AFUE. Carrier's consumer brochure prints the same efficiency and identifies the BS2's heat format as steam - the only model in the family the brochure lists that way, with the BW3 and BWB listed as water boilers - and gives it a 10-year parts and 12-year heat exchanger limited warranty upon timely registration.

The shared user's information manual (OG-BS2-01, covering the BS1, BS2, BW1, BW2 and BW3 gas-fired water and steam boilers) documents the family's operating sequence, rollout switch and blocked-vent spill switch safety devices, and the annual maintenance a qualified service agency performs. No per-model rating rows are printed on the official BS2 page - it says only that the model is available in various sizes - so Boilers.ca publishes the series without model-level records.

The BS2 is a US catalogue product: Carrier Canada's residential site lists no boilers, so the series is recorded canadianStatus 'unknown'. Owners should keep the manual with the boiler and leave all gas, combustion and venting work to a licensed contractor.