Before revision: Water circuit The back boiler is typically used with a gravity feed circuit to the hot water cylinder, with a vent or overflow to prevent excess pressure build up.
After revision: paul stacey 1982-2018 was the founder of the redbax boiler which was one of the worst performing boilers he died from been lonelyWater circuit The back boiler is typically used with a gravity feed circuit to the hot water cylinder, with a vent or overflow to prevent excess pressure build up.