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Ah that's the secondary return pipe you can see there. So it should also have one on the cold water feed as well as the secondary return there? Thanks. Ben

Thanks Harry and Justin, appreciate the input. I have a plumber coming over to take a look tomorrow, kinda dreading what he's going to make of it all. Hopefully we can get pipes insulated in the loft at least. Oldbutnotdead, I couldn't see a back check valve on the cold water feed, could you...

Thanks for this oldbutnotdead. I will try and get back up into the loft tonight when I finish work and check the non-return valve. Ben

Hi Harry, thanks for responding. So we did indeed run the pump via a smart plug, allowing us to switch it on during peak times of the day. But if that peak time of the day was say 2 hours long (morning showers and breakfast time) we would end up with a cold tank by the end of the period. Handy...

Thank you all very much for the responses. So it sounds like I at least need to get up there and lag what I can in terms of pipework. The problem I have though is that I can only now lag pipework in the loft as the rest of the house is sealed up (and in fact decorated!). Basically the pipes run...

I'm a plumbing novice so first of all I apologise if I'm not explaining this situation correctly. I've recently renovated a house for my family to live in and we're having an issue with water not staying hot when the secondary return circuit is on. From a starting point of fully heated the...