TheScullster wrote:

What make/model of boiler is it?


Glow worm Space Saver 50 - yes I know this is old and a bit undersize after
all the mods.

I doubt that can be converted to sealed system operation (since that is
an guarenteed way to fix overrun problems!), but it might be worth
checking with Gloworm.

I wanted to iron out the problems, then introduce new boiler and pump.

A new boiler will be able to run sealed anyway - so you could lose the
vent and header tank etc anyway.


--
Cheers,

John.

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