dbroms wrote:[color=blue][i]
Set Square Wrote:

In an earlier contribution to this discussion,
dbroms wrote:


OK, just to be *sure* what you've got: Are there ever any
circumstances when
the boiler fires but the pump doesn't run?
The answers to those questions should confirm - or otherwise - that you
have
a fully pumped system.
--
Cheers,
Set Square
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thanks for the reply. The pump is always on when the boiler fires, you
never have just the boiler on.
The pump connects to a very small junction box in the airing cupboard
which just has a live and a neutral in it which i assume comes straight
from the boiler.

cheers
Daz

This doesn't prove that the HW isn't gravity fed - as from what I
understand from the system as you describe it, there is no option to
have just the HW heating, i.e. when the heating is on it is always
heating both the HW and the radiators...am I right?

The only way to really know is to look at where the flow to the HWC
comes from - in a gravity set up it would usually come directly from the
boiler in a seperate pipe to the flow to the radiators, but it could
technically branch off at some point before the pump. If it is T'd off
at any point after the pump and the sytem is fully pumped.