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So I guess the effect of the thermal valve really is to impose a lower limit on the top of the thermal store (in terms of the heated water that's added). The elec boilers will go up to 90 degrees - pretty decent! Anything above 50 is going to be useful for hot water. I'm now wondering about...

I'll try another way. The point of the thermal mixing valve is to prevent the cold return from the radiators (+14degrees from elec boiler) going straight into the top of the cylinder and cooling the overall mass of water - yep? It works by circulating the water thru the boiler until it reaches a...

Got you - makes total sense now. So I've just got to look for a valve with the hightest temp mixing point I can find and crank it right up. I'm guessing there will always be a compromise in terms of what is sent back to the cylinder to prevent a couple of pipe's worth of water spinning around...

That's the bit I'm not getting - I do apologise. To my understanding the Thermal mixing valve jobby is stopping cold water going into the cylinder by circulating it around the boiler circuit until it reaches a chosen temperature. The standard TMV's I've found are there to prevent water...

Hi Simon - thanks for that. I totally get the TMV where it is - very logical I just hadn't thought of it. However I've struggled to find something that performs what's required. Closest I've found so far is a Solar Transfer Valve by Reliance. That can be set up to 70 degrees (I've assumed the...

It might be barmy - I think Simon's point regarding the boilers is critical. I'm using 2 Amptec boilers which need a high flow of water across them to prevent there being no more than 14 deg C (from memory - may be wrong) rise in temp across the boilers. I suspect that this is where I open...

Simon - thanks for that. I came up with something quite similar I think a few days ago - I've uploaded a schematic which explains it I think. But basically 2 pumps and two 2 port valves: One pump + valve for the rads, another pump running faster than rad pump and pulling from boiler again...

How to get a thermal store out of a tank in tank cylinder with only 2 ports to the primary tank - will it work though?

I'm trying to avoid using just the boiler to drive the CH direct - I want to use some of the energy in the cylinder but maybe I'm making life too hard. From my understanding of the installation diagram that isn't possible. Reason is that I am (for now) stuck with elec boilers and cheap rate...

Hi I bought an ACV SLE 240 tank believing from their website that it would have multiple connections (the plus model) and having found a cracking deal. Well, as ever if it's cheap there is a reason: these were clearance units and were not the plus version (and are no longer sold) - only coming...

Help needed to sort out slight cylinder malfunction

You're right. I have the option of going vented or unvented with the cylinder. I have been advised that unvented gives the best performance but as I haven't been able to figure out the installation 100% for unvented it looks like I'll go vented and live with a local drain from the tank. Thanks...

Hi I'm installing a heat store on the ground floor and before I start carving up the concrete floor for the 22mm pipe from the tundish I'd like some advice please. There is an outside drain about 3.5 metres from the cupboard where the cylinder will be sited - not a straight run but ok. It's...