Margaret Macfarlane wrote:
Hi,

Just found this newsgroup and discovered that there are more than
14,000 headers to download so forgive me if this question has already
been asked

I have a gas central heating system with 6 heaters. It is at least
10 years old. When I switch the heating off for a long time (over
summer) there appears to be a large build up of air in the system
which gets stuck in the pump which then needs to be bled. Scottish
Gas came to fix and told me that the build up of air was actually gas
which was coming from various nasty stuff inside the heaters and
provided me with a hefty quote to flush out my heating system. My
question is this: can this be done diy (husband is quite good at it)
and if so what does he need in the way of equipment and chemicals etc.

Thanks in advance

Margaret

If Scottish Gas is anything to do with British Gas ( i.e. really Centrica)
they are useless & expensive.
Flushing was covered very well by Andy Hall in a posting.
Search on groups.google.co.uk for
Central +heating +flushing +Andy +Hall

Don't forget to put corrosion inhibitor in when the system is refilled.