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Examples of terrible mistakes

Tony, I did consider rotating the pump, then thought better of it as I didn't want to risk possible plumbing problems, as I was in enough of a bother getting the electrics done ;-) The pump connections were those horrid hold a tang while trying to push the cable into a small hole type. Really...

Just to report that all was installed this afternoon and works fine, first time. It was plain sailing apart from a rather tricky to reach terminal block on the pump which required a mirror to see. Got the heating on just as the better half was complaint of the cold. I had not felt it as...

OK, that's great. I got the Honeywell wireless stat today and bought a cyl stat at B&Q as well as control centre terminal box, so today's project is now in hand, will report back.

Brilliant, that looks ideal to me. OK it doesn't stop the DHW getting too hot when the CH is on, but apart from that it allows the sort of extra control I am looking for. I need to investigate how to fit a cylinder thermostat now. The cylinder is all covered in foam, perhaps there is a cutout...

Tony - thanks for that, most helpful. I am slightly resistant to changing the boiler because it is in a cupboard downstairs( with the cylinder), and flue goes straight up through the ceiling to the roof. The piping is microbore and it is all underfloor, no underfloor access because house is...

Good point. I will need to check if the zone valve should go in flow or return to the cylinder. Found the wiring details for the C Plan now, so have a better understanding of how that works now.

I am slowly getting the picture now, thanks. So, it looks the parts I require are a 2 port motorised valve, a tank stat and the programmable stat and some wire and junction box to connect all. The existing timer just for HW would be kept in place. I will get a pro to do the plumbing...

A few more questions, assuming that I ca use this system with the primatic. Is what you are proposing called the C Plan? Do I also require an automatic bypass with that system? Will the wireless programmable stat be suitable allowing me to do away with existing dual timer? In the C...

Thanks BoilerMan. The present system uses a primatic type HWC, is that still suitable for conversion as you suggest?

I have a rather old Stelrad Ideal Mexico Gas Boiler. Gravity fed HW and pumped CH. TRV on all rads except Towel Rail. Timer is also old electromechanical model. I would like to add a Honeywell CM927 wireless programmable thermostat to the existing boiler. Should the CM927 unit be wired to...