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I assume the STC1000 unit can be used to replace a thermostat in any equipment that needs heating (or cooling) but it certainly has greater accuracy and a lesser hysteresis effect than a conventional thermostat. See...

If you want a really accurate temperature controller then I suggest the Elitech STC1000. Fantastic piece of kit at less than £20. I bought one to prevent the pump on my wood pellet boiler starting up before the boiler contents reached 60C.

Thanks for the info. My oil boiler is only just over 1 year old so hopefully many trouble free years ahead then! Where did you find that table of efficiency data? We also have solar thermal panels which gives us all the DHW we need from May to September usually. Sometimes need to run the boiler...

Thank you for your latest response. Are you at all concerned about the potential negative effects of boiler cycling such as extra fuel consumption and/or life-limiting damage to the boiler itself? I have not come across any hard evidence for this (maybe I haven't looked hard enough?) but I...

OK, thank you. Our TRV's also throttle right down but I have no idea what the flow rate is. Sorry, I don't know what PP control means. Our circulation pump is a bog-standard Wilo jobbie with no fancy electronics, so all I can do is alter the speed from 1 to 3, currently it's on 2. Did you...

When your boiler is giving an average output as low as 2.5kW, what do the on/off times look like please?

I have done a search on oil boiler cycling in the forum and this appears to be the latest thread on this topic. I have the same problem with my Grant Utility Pro 15-21 oil boiler. Our C/H system has 15 radiators: 6 singles, 2 towel rails and 7 doubles. All bar one (one towel rail) have TRV's...

FiremanT - sorry to disturb your slanging match with Bernie. Just to say that of course I'm sure there must be lots of faulty solder joints out there and Bernie's theory may/may not be correct but when these faults are "above ground" they are readily corrected. When buried in concrete screed...

Dan - just to let you know that the loop idea combined with the NRV have worked a treat! The loop is about 300mm as that's all the space I have. However mine looks like an upside-down "n" (i.e. a "u") - I thought the loop would have to be that way because the cooler water, being denser, would...

Just wondering what is the "take home" message here - 92 views to the thread but only one reply? Is it a difficult issue or is the answer so obvious that I should not have been so naive to even ask? Not being provocative, just curious. I always appreciate advice given on this forum.

My previous home was a detached bungalow built in 1970 and which we bought in 1978. The seller wanted us to pay extra for the carpets. We declined as we very stretched financially - it was our first mortgage. When we moved in we were surprised to see that they had left the carpets and thought...

Dan - thanks for your response. What size loop did you put in your system? I have space for about a 40cm drop from where the C/H flow pipe exits the thermal store - is that sufficient? I guess I could put an NRV in the vertical drop as a belt & braces approach.

Ah Denso tape. Disgusting stuff to handle but does a marvellous job in the event of slight leakage from underground foul water joints e.g. clay to plastic!

I would be grateful for some advice regarding the installation of a non-return valve (NRV). I have a thermal store (TS) with three coils and which is essentially being used as a buffer tank (boiler is wood pellet fired) in that one coil is used for the boiler flow, the second is used for the...

OK, thanks.

OK gentlemen, another idea! As the thermal store is no longer used as a thermal store per se (i.e. not used for DHW as we have a separate unvented DHW/solar tank now and the TS solar coil is redundant) what about keeping the boiler side as a vented system and heating the store direct as now...

OK chaps, I get the message. Thanks for your thoughts.

Yes the latter is true - there are TRVs on all the rads and so as the temperature approaches the set temperature then the heat demand could drop below 5 kW. It definitely modulates down over a prolonged period but I couldn't say how long. It takes about 5 minutes to get up to full power if the...

I understand that it's not designed for on/off operation - far from it, as it takes an age to get up to full steam again once it has restarted. I'm asking would the boiler necessarily be cycling on/off if it runs at minimum power (5kW) - would it not simply "tick-over" until the room stat is...

It's an EkoHeat 2500 (25 kW). I'd have to ask them the question as there's nothing in the manual. The minimum heat output is 5 kW so that using your formula would equate to a 275 litre TS