JK wrote:

the way to find out if I have sufficient pressure would be to take the
garden hose up to the highest point in the system.

Alas not in this case. For a conventional system with a header tank,
then yes the only requirement on the mains presure it that it can get
water as high as the header.

In a sealed CH system such as yours, the mains pressure needs to be at
least as high as you are going to try pressurise the system with
(typically 1 bar, or the equivilent to a 34' head of water). Having said
that, most mains supplies ought to be able to manage that much.

More info in the sealed CH FAQ:

http://www.makewrite.demon.co.uk/SealedCH.html


--
Cheers,

John.

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