product literature: xp fire tube boiler (100 series)
Product Literature: XP Fire Tube Boiler (100 series)
The XP PLUS water heater models XWH -1000 thru 3400 are certified to the ANSI Z21.10.3-CSA 4.3 water heater standard. These models are approved for potable water heating applications only and cannot be used in closed loop space/hydronic heating applications.