How to add cleaner to flush hot water baseboard system

dough041

Probably a stupid question but , I am looking to replace an older utica gas fired hot water baseboard system with a mod con. Should I just flush the lines good with fresh water before disconnecting the old unit or should I add some boiler “cleaner” , run it to circulate the cleaner then flush and refill with fresh water? Also I have some hercules boiler/system cleaner, how would I add it to my closed system? Thanks for any help. I will be adding all new pumps, diret seperator etc…

hot_rod

Flush with water pressure. Use the Hercules after you install the new boiler to get all the flux, oils, pipe dope, etc  out

dough041

I guess the question I have is how to I physically pour/add the quart of boiler “cleaner”?

EzzyT

You’ll need to pump or inject it into the system.
Most of the hydronic cleaning & inhibitors chemicals companies have injectable cans that one would use a boiler to get into the system.
But as @hot_rod has said you need water pressure in order to due the right job of system flushing.
A flush cart is what is needed.