SL Series Condensing Boiler

The SL Series is IBC's flagship residential condensing boiler, converting natural gas or propane into space heating at up to 96% AFUE efficiency.

It supports multi-zone pump control for up to four heating zones, with venting runs of up to 480 feet using standard PVC, CPVC, or polypropylene pipe — giving installers flexibility in tight mechanical rooms.

A turndown ratio of up to 8:1 lets the boiler match its output to the heat actually needed, reducing short-cycling and keeping the home comfortable even in extreme cold.