SSR, relays and new board mounted on a aluminium bracket where the old Gicar unit attached. Everything seems to be functioning as it should.

BTW I took the opportunity to fix some of the dumber bits of VBM's wiring like using a PVC insulated wire on top of the boiler with no standoff (the level sense earth return). The replacement wire is ETFE insulated high temperature wire, mounted on a 10mm standoff.
I also completely stripped and cleaned the boiler and all fittings and made a little insulating jacket from silicone foam with a neoprene outer.
I'll send the revised boards out for fab, make one up and test it out then I'll post up the design on the sharing page.
A couple of things will change: I'll make the level probe wires pluggable to ease fitting the board and I'll increase the value of the current set resistor for the "On" LED. Damn that thing is bright.



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