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Will check the valve when I get home. Can confirm though that the hot water is programmed to be on 24/7, has been that way for years. If it's ever on a program it just goes cold before you know it.

This resulted in it going back up to 49, so I then turned it all the way round to 1, and that basically made no difference. I'm pretty definite now that it's a faulty thermostat, unless anyone has any other comments or ideas?

That was what I did first, by turning it from 4 to 5. That is anticlockwise, and you can see from the manual that the higher number equates to a higher temperature, even though it's anticlockwise. However as that appears to have made it colder I wonder if the stat has been wired wrong or...

Ok so this morning's update, water is now at about 30deg. I'm now wondering if turning the stat anticlockwise from 4 to 5 makes it colder, so I've turned it clockwise round to 2 to see what happens...will report back when I get home from work:unsure:

Already done that, and it's pretty warm but by no means hot. You can keep your hand on it as long as you like without it getting uncomfortable.:(

Thanks for the replies. Can confirm there is no thermostatic mixer anywhere on the system. Also tried running a cup of water and measuring with a conventional thermometer, it actually comes out just under 40 - I can definitely feel it's colder than straight out the tap so I'm assuming the 46 is...

Oh and thanks for the reply by the way @Stuckinarut (y)

Probe thermo - don't own one but will purchase if necessary to get to the bottom of it;) Thermostatic mixer - I'm almost positive there isn't one, I'll double check in about an hour when I'm home Cylinder thermostat - unfortunately it doesn't have degree markings on it, it's just marked 1...

As per title. British Gas 430i boiler feeding into a Santon PP300B hot water tank, it's literally on 24/7 but is very poor at actually heating the tank. Initially thought it was a faulty thermostat that wasn't calling for heat, but even with the boiler on constant it has the same issue. It's...

Thanks both. Woody - re aesthetics, that's all in consideration:) It would basically be a single storey rear extension at first, then the big one would be building a second storey on top of that as well as a double storey side extension. It would also need fairly major changes to the roof...

Evening all, first post here, just in the process of buying my first house and it will be a project so I'll be using this forum quite a bit:) I'm getting a house which I want to put a big extension on. I can't afford to do the full extension yet, but will need to do a small rear extension...