Hello,
BEFORE
I cleaned the system last year with a mains flush. There was a little inky stuff and a bit of sludge at the very end when I emptied out the rad I took off the wall, but no rads have ever had cold patches. Most pipes are hep20 but I had small section replaced by copper 2 years ago (should the system have been flushed with new system cleaner after adding copper pipes? It was not)
NOW
Both heat exchangers are broken in my BAXI combi boiler. The plate exch got blocked and caused the boiler to bang. DHW slowed to a trickle and after some weeks it overheated the main heat exchanger which is now leaking out the condense pipe.
The gas engineer will replace both heat exchangers but he recommended I clean the system before he does the job.
I have filled the system with x400 and run it for a few hours and left the chemicals to work for a few days. I will top up with more x400 and then run it again for 2 hours. Then I will take off a radiator and connect one hose to mains water and the other hose going down the drain, then proceed to flush the system through with clean water in both directions.
I will then repeat with x800 cleaner with all rads closed, just to clean the boiler.
Is there anything wrong with my plan? Should I hire a powerflush machine (£120). What advantage is there in doing a powerlush other than it being quicker? With my manual method I can let the chemicals work for days, I can still heat the water and pump it round with the boiler and rinse it at mains pressure. Is this going to be good enough or should I hire a machine?
I don't have experience to know if a powerflush is worth it so a opinion from seasoned professionals would help me decide whether to shell out an extra £120 on what is already going to be a costly repair.
Does a powerflush push water round any better than the boiler's pump or mains pressure?
Thanks.
BEFORE
I cleaned the system last year with a mains flush. There was a little inky stuff and a bit of sludge at the very end when I emptied out the rad I took off the wall, but no rads have ever had cold patches. Most pipes are hep20 but I had small section replaced by copper 2 years ago (should the system have been flushed with new system cleaner after adding copper pipes? It was not)
NOW
Both heat exchangers are broken in my BAXI combi boiler. The plate exch got blocked and caused the boiler to bang. DHW slowed to a trickle and after some weeks it overheated the main heat exchanger which is now leaking out the condense pipe.
The gas engineer will replace both heat exchangers but he recommended I clean the system before he does the job.
I have filled the system with x400 and run it for a few hours and left the chemicals to work for a few days. I will top up with more x400 and then run it again for 2 hours. Then I will take off a radiator and connect one hose to mains water and the other hose going down the drain, then proceed to flush the system through with clean water in both directions.
I will then repeat with x800 cleaner with all rads closed, just to clean the boiler.
Is there anything wrong with my plan? Should I hire a powerflush machine (£120). What advantage is there in doing a powerlush other than it being quicker? With my manual method I can let the chemicals work for days, I can still heat the water and pump it round with the boiler and rinse it at mains pressure. Is this going to be good enough or should I hire a machine?
I don't have experience to know if a powerflush is worth it so a opinion from seasoned professionals would help me decide whether to shell out an extra £120 on what is already going to be a costly repair.
Does a powerflush push water round any better than the boiler's pump or mains pressure?
Thanks.