You only have to look back a few years when
Glowworm had (still have) 6 pcbs which are
identical in operation and totally pin compatible, all
very different in design.

I assume these are all different sizes, and prices. So it is probably worth
using the cheapest of these boards,providing you can get a fixing for the
board.


While I've often wondered why, and sometimes thought of designing a
generic boiler control PCB, manufacturers are showing no signs of
unifying at all or having any intention of doing so


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--
geoff