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Many thanks for your reply Fredthefly12. Wiring now complete, checked out and working fine. In the end I used just one changeover relay so now I have a spare. Just have to remember to run the C/H pump now and again in the summer to make sure it remains in good order.

Yes, I looked at the PumpPlan Twin Headed Domestic Circulator Pump, but it is an expensive piece of kit, and would not easily fit into my existing set-up. Two new pumps off a well-known on-line auction site and a few bits and pieces to complete the work has been a much cheaper option. I've...

Sorry, you asked how I am wiring the two pumps. The pumps are easy; just from the output from the stats. The boiler is a bit more tricky. I have settled on a pair of relays (with contact suppressors). One relay coil will be energized from the room stat, and the other from the cylinder...

Hi. I have also used a volt meter on the output from the cylinder stat. It is showing mains voltage when calling for heat, and no voltage when satisfied, as expected. The room stat is doing the same, but differs from the cylinder stat in that the neon in my tester screwdriver does not...

Greetings All, new to this site. After years of problems from my Drayton Flowshare diverter valve, I have decided to switch to a two-pump set up. So, valve gone, replaced by a tee, two check valves and two pumps. I'm in the process of rewiring, and have noticed when checking, that the cylinder...