In an earlier contribution to this discussion,
angusclaydon wrote:


Just sourced a wylo (£30 something) locally as its cheaper than the
original grundfos (£57 yikes) ...

Do I have to bleed air out once the new one is in? Getting to the back
of the boiler is nearly impossible ? or maybe I can just bleed it out
of the radiators

rgds

If the valves work ok, you'll only introduce a pumpful of air - which isn't
very much. It should bleed itself with the end-cap removed. Any remaining
air should either go up the vent pipe or collect in the radiators. Try to
mount the new pump in a way which enables you to get at the end of the
shaft - or drill a hole through the joist for screwdriver access.
--
Cheers,
Set Square
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