Originally posted by: rob423
I am considering replacing my old boiler with a new one and I too am wondering whether a power flush is required or just a chemical clean and flush? Out of 10 radiators, 4 single ones are old and 6 double ones are only 4 years old.
I flushed out the 4 old ones as best I could with house water pressure when I newly installed the 6 double ones and I also replaced all the copper 15mm pipe throughout with 28mm main runs downstairs and upstairs with 15mm tap off to each radiator using speedfit plastic piping and connectors which are great.
Any thoughts would be helpful - cheers.
Hi rob 423 - and a big welcome to the forum.
The people coming to quote to fit your new boiler should be the ones really to advise you about this.
Since it is a requirement of the new boiler installation that the appliance shall be fitted according to 'manufacturer's instructions' - this will normally include a requirement to 'clean' the system.
Also, the installer will have to complete the 'Benchmark' commissioning log prior to handing over to you. This log asks the question of whether the system was cleaned out and what cleaners were used. Your installer will need to complete this and it is unlikely that they would want to accept a DIY cleaning for this.
Really I would recommend that you talk to your installer and ask what he/she suggests is required prior to agreeing a contract.
Any installer worth their salt would be assessing the system and the cleaning as the 'norm' and should act appropriately.
Make sure that the appropriate corrosion inhibitor is being added in the correct proportion as well - very important.
Most installers will now also fit a magnetic filter as standard, although this should always be considered as a follow on treatment to protect the system, not as the cleaning/flushing process itself.
You haven't said how 'old' the 'old radiators' are, but do consider incorporating upgrades to these as well if relevant, during the new installation.
Hope that is of help - and do let us know how you got on.