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You have some really helpful comments Dan, thank you. The world is a much more pleasant place thanks to people like you.

Interesting point you make about legionella. The cylinder in question is copper, pipework all copper. Temp of cylinder is always below 20 deg C when not in use and 60+ deg C when in use and a good flow through. I'm glad I looked into this and learnt about it, but having done so, do not feel that...

Yes, I can see that will work, but a lot of expense and overkill for what I want. Maybe I'll have to work something out with RF stats after all. Does anybody know if you can get RF stats with relays to extend range? And the other problem is finding an RF setup that will work with two...

I have two separate HW cylinders, a long way from the boiler programmer for wiring stats or using RF stats, but they are both within range of our wifi /wireless network connection. Programmer is also within range of the wifi. I would like to set the cylinders up with wireless stats that will...

When the programmer initially calls for heat after being off, unless the buffer tank has a full charge (bottom stat is hot), the zone valve will open and the export pump, which brings hot water from the boilerhouse into the house will fire up. This hot water will then circulate around the CH and...

Well, the buffer tank is calling for heat when the charge pump comes on, and the power to the pump does come through the cylinder stats if you could call that the thing calling for heat powering the pump. Programmer calling for hot water will start the CH / HW circulating pumps. If there is a...

:roll: I am unsure of everything now. I think I could solve the pipe stat problem with another (non-latching) relay, so that instead of the charge pump powering the ZV and EP and being wired in parallel to them, it would switch a relay that would allow power through from the programmer to...

Thanks. I'm not sure how this would help though? Which tank would it be on?

What do you mean by an RF tank sensor please?

Thank you, that sounds like what I need. I'm not completely sure from your post on how to wire it 'though?

sequential logic I believe it is called...anybody?

I wasn't including the whole system to try and make things a bit simpler. But possibly I have done the opposite... Outbuilding: Log boiler with export pump to deliver water to house House (existing): - Programmer to control separate HW and CW pumps and circuits. Output from the...

Actually I'm not quite there...I just realised that there needs to be another condition. If the water coming into the house via the export pump is below a certain temperature (so no excess heat available to charge the buffer) I don't want the charge pump coming on and taking away more heat...

Yes, I think that's it! A lot simpler than it seemed... I think there are two relays to stop the CH and HW feeding back into each other if only one of them is on. Thanks for your help.

Thanks, I couldn't work out how to do that...

//media.diynot.com/121000_120756_94609_21610927_thumb.jpg Please excuse my complete lack of protocol in this diagram. What this does is as follows: CH and HW at the top refer to 240V outputs from my heating programmer. The CH and HW outputs go through relay switches which are...

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