On Thu, 26 Nov 2009 10:30:56 -0000, TheScullster wrote:

Does anyone know a source for suitable lids for these.

Try Plumb Center, BES, basically a proper plumbers/builders merchant
rather than a shed.

Since a CH upgrade the header tank is getting quite a bit hotter than
previously and I would rather not have hot water vapour condensing on
the roof trusses.

The header tank shouldn't be getting hot maybe just a little warm
*if* there is lot of expansion to handle. Hot indicates circulation
through the header tank (pump over) which should not be happening.

--
Cheers
Dave.