What is Boiler Dry Cycling?

The boiler is currently at set point and is in stand-by mode as further heat is not required from the system load. Due to the ambient radiated heat losses, together with the flue draught heat losses (“standing losses”) the boiler will naturally cool down over time which may cause the boiler temperature controls to instruct the boiler to re-fire and return the boiler back to set point. In this case the heat is not being used by the system base load; it is only replacing the “standing heat loss” and therefore wasting energy.