On 16 May 2007 06:40:29 -0700 Golan wrote :
The pressure on the boiler is low than normal about 0.7.

That OK in a flat: 0.7 is about 20ft head which is a lot more than you'd
have with a header tank in the flat. Some boilers will cut out if the
static pressure cold drops below 0.5/0.6

I know that when the hating is on it needs to be around 1.5

No, it will rise when the system heats up, but there is no minimum
figure. If you had a big expansion vessel it might rise to 0.8 and that
would be fine. In a flat the concern would be if was rising to 2 or
more.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk