Boiler change and microbore heating

PR1NCESS · 28 Aug 2010

Hi there
My old Potterton boiler needs replacing and I've had several quotes to do so. However I am now confused as all but one of the engineers have recommended that I also change my microbore radiator pipes to 15mm because I live in a hard water area. One said that I should leave it but have a descaler fitted. I've also been told contradictory things about power flushing a microbore system, some say that it can be done others say it can't. What should I do? Please help me 'flush' out the cowboys (pardon the pun). Many many thanks for any help.
Princess

gas4you · 28 Aug 2010

I can't see no problem leaving the microbore in place. I have done loads of boiler changes like yours with no problems.

Scale should only be a problem with hot water, not system water, unless you have a leak and it is constantly being topped up.

It is very much harder to flush a microbore system to the same standard as a small bore system, but it can be done. Then have a Magnaclean or similar fitted with the new boiler.

So unless there is something that these other installers can see that I cannot from here, go with the one who will keep the pipe work if you think he is trustworthy and hopefully has come recommended.

DeltaT · 28 Aug 2010

gas4you said:
I can't see no problem leaving the microbore in place. I have done loads of boiler changes like yours with no problems.

Scale should only be a problem with hot water, not sysyetm water, unless you have a leak and it is conatantly being topped up.

It is very much harder to flush a microbore system to the same standard as a small bore system, but it can be done. Then have a Magnaclean or similar fitted with the new boiler.

So unless there is something that these other installers can see that I cannot from here, go with the one who will keep the pipe work if you think he is trustworthy and hopefully has come recommended.

I agree Dave, if the system circulated before, why would it not after a boiler change??!!

Perhaps it would be wise to change your radiator valves though.

PEDANTICVINDICTIVEMAN · 28 Aug 2010

If it works now it will work with new boiler, 8mm can be flushed no problem, put X400 in for 3 weeks with old boiler, then flush system out with mains water, fit new boiler and all will be well in the cosmos.

PR1NCESS · 28 Aug 2010

Thank you to all my knights in shining armour, that has made my mind up. I'm going to do exactly what you recommend. Many thanks.
Princess

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Boiler change and microbore heating

PR1NCESS

gas4you

DeltaT

PEDANTICVINDICTIVEMAN

PR1NCESS

DIYnot Local

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