It is always recommended to first power flush the boiler and the related hydronic components prior to the final filling. Water quality for a closed loop hydronic is crucial to longevity and performance of the system. Cleaners such as Sodium Phosphate to de-grease or the use of Fernox can be used to help treat the system. Remember to clean out the magnetic filter prior to final filling and pressuring the system.
Should the NextGen Boiler unit be cleaned prior to operation?ebizuniverse