On Wed, 01 Mar 2017 22:14:04 GMT, eggheadstevens
m wrote:

replying to Martin Pentreath, eggheadstevens wrote:
It would actually increase the pressure in the heating system causing it to
escape out the pressure relief if the in coming mains as would be expected be
greater than 3 bar

It was TEN years ago mate.
Read this
http://wiki.diyfaq.org.uk/index.php/Home_owners_hub
--

Graham.
%Profound_observation%