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Been doing more reading on TMVs: Seems a good idea to have hot enough water to kill off bacteria, but still have protection at the taps for anti-scald. Need hot enough water available for some purposes like cleaning greasy items in the kitchen sink. Looking at our problem , the main one...

I read that it is more efficient to let the boiler heat up rather than limit it too much, but indeed before I had the room stat, I did keep the boiler stat at a reasonably low temperature (except when it was very cold weather and the system struggled to maintain the house at a comfortable...

Yes, I hear you all - fully pumped, new cylinder... However, I have been doing this in easy stages, first was to fit a room stat/ programmer, along with cylinder stat that limits the DHW temperature when only DHW is on (but not when CH is on). The remaining problem with potentially...

Yes John, but how about the Thermostatic mixing valve idea? Sounds easy enough to implement.

Right, further research on the Web indicates that no valves should be fitted to the flow or return to a primatic cylinder as it is also the f/e tank. (So much for the plumber saying that it was OK to fit a valve there). Apparently the solution to the problem of potentially scalding water...

Excellent John. I dare say my system is full of iron oxide. Magnaclean sounds like a good idea. Cannot put any inhibitor in because of the primatic.

Yes John, it was an emergency, hole in cylinder, had to get it working quickly, so straight replacement.

Yes John it is already foam lagged ( it was replaced a few years ago with another primatic). Edit: See your point about pipes. I'm really happy with the system which has been virtually fault free for over 20 years unlike modern complex systems which may be more efficient but require...

Thanks, had plumber round this afternoon and advises it is fine to fit zone valve in the return from the tank. He was taking a simplistic view of the wiring problem v the 5 wire actuator, fortunately he is happy to leave the wiring to me, and I am happy to leave the plumbing to him. Only...

Thanks for the reminder John, I will have to add some insulation on the pipes as there is none at all.

OK, my system is rather ancient - a Stelrad Ideal Mexico with pumped CH only (with TRVs). HWC is a primatic single feed. I recently upgraded the control system to use a remote thermostat/programmer and that works well, but I need to add a valve to stop the hot water getting too hot when...

Ok guys thanks, I have bought a 28mm valve with actuator on eBay, for less than many are charging for just the actuator. Will probably use the 28mm with reducers and flog the 22mm. Alternatively I could swop the actuators.

Thanks for all the replies! @45yearsagasman Yes primaries are 22mm on the boiler. @JohnD - I don't know, but the spare heads seem about as expensive as the whole 22mm unit I bought (Paid about £25 on eBay). @DP Thanks I will investigate the BES price. Anyone want a 22mm Honeywell...

Alternatively could I use a 28mm zone valve in my 22mm system with some sort of adaptor?

I was about to start the wiring for converting my system to the C Plan. Bought a Honeywell V4043H1056/U 22mm 2 port zone valve (normally closed). Unfortunately it only has 5 wires, and is missing the extra contact on the microswitch that I need for my system. (No White Wire) The...

This was in October 2008 so a bit late to complain now I am afraid. I should have at the time.

Was not sure if it was correct etiquette to mention the name of the company here. It was Comet.

I did consider it, but unfortunately at that time I was up to my neck in other things and I also did not want to worry my mother-in-law with all of this. It was an eye opener for me that these nationwide warehouse places employ such poorly trained people to do electrical installation jobs...

We were getting a new cooker installed for mother-in-law. I got down to the flat and the van was there. I ran round to the flat and the cooker was already there wired in. I ran back outside and caught the driver as he was leaving. I asked if it was installed and he said yes all OK and he left...