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Having had a good look over my heating circuit and rads, I've established that approx half the circuit is T'd off the main 22mm flow and return pipes (6 rads), then the flow and return have reducers down to 15mm and continue the circuit. The latter half serves 4 rads, which I've worked out to be...

ok I can see where I've caused some confusion by calling it an inhibitor. Scale reduction should have been more appropriate. The thermal store does have a high storage temperature by design, thats the only way we get hot water. Its is very hard water in my area. The taps even get lumps of...

It is indeed a polyphosphate, an aquadial combi-care compact: http://www.aquadialwaterfilters.co.uk/ Here's one of the previous posts that discussed similar units: http://www.diynot.com/forums/viewtopic.php?p=383679#383679 So I'm hoping I have understood this correctly and its safe...

Chris, now you have confused me....not that it takes a lot. The radiator/thermal water has fernox in as per usual. But the inhibitor is for the tap water (hot) before the water passes through the coil to prevent the coil from getting too scaled up. This is how I've seen it explained and...

Sorry I probably just didn't explain it clearly. What I meant was when we turn off the stop tap for any reason, there is a tendancy for the water to drain backwards down the pipes if anyone then turns on a tap or flushes the WC. Because the DHW coil is almost the highest part in the system, it...

Its for fitting onto the DHW pipe before pipe goes into my gledhill thermal store, which is how its recommended for use (and in some posts on this forum). The same pipe has a T junction also feeding internal cold taps etc. So I'm proposing to fit it after that junction, but before the DHW coil...

When fitting an Aquadial scale inhibitor, which side should the check valve be fitted? As the instructions state there must be no possibility of hot water transfer back through, which could happen in my mains pressure thermal store if I turned off the main stop cock for any reason. And I'm...

So far, we don't seem to have suffered store temps too high (been using it for 5 years). Usually the water gets used before its too hot. Sometimes the CH comes on by itself so I'm assuming there is something in the system set to dissapate the heat, although I can't see anything in the wiring...

Having studied the wiring logic, I'm thinking if I fit a pipe thermostat to the boiler flow pipe fairly close to the Rayburn, I could wire this up to provide live to the boiler pump if the pipe reaches a certain temp. This should ensure if the boiler was turned off, and the missus was cooking on...

We have a system thats been in a while and uses a Geldhill Boilermate II thermal store with an oil fired Rayburn Nouvelle. My question is concerning the almost permanent running of the boiler pump. We only switch on the Rayburn boiler when we need instant hot water or central heating...