Companies that sell high-efficiency commercial boilers include Cleaver-Brooks, Lochinvar, LLC and LAARS Heating Systems Co. The websites for these companies list various commercial boilers, including condensing, fire-tube, power-fin and electric compact models, and provide detailed specifications for each one.
Lochinvar offers commercial boilers that feature a thermal efficiency rating of up to 99 percent in low temperature applications. Its FTXL line of fire-tube commercial boilers features the AHRI product certification for thermal efficiency, while providing a heating power that ranges from 399,999 to 850,000 British thermal units per hour. Cleaver-Brooks and LAARS Heating Systems Co. also provide several different lines of commercial boilers, with thermal efficiency ratings of up to 95 percent for the MagnaTherm and up to 87 percent for the ClearFire Economizer line.