"Frank W" wrote in message
...
On Tue, 19 Aug 2003 21:20:15 +0100, "IMM" wrote:


What do you mean?

Well, on my own combi-fed central heating system, I have to keep
checking the pressure occasionally by looking at a dial on the front
of the combi. Every time the pressure drops below the recommended
minimum, you have to manually top up the pressure using a removeable
link to the mains water supply. What I'm thinking of is a device that
will keep doing that for you whenever the pressure drops (say due to
small leakage at pipe joins or whatever). My own system often needs
its pressure topping up manually.

It has to be topped up manually. If it keeps dropping you have a problem,
such as: water leak, the pressure in the pressure vessel needs topping up,
the diaphragm in the pressure vessel is holed, hole in the plate
heat-exchanger, etc.


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