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Yes, though if the house is of standard construction, then you should find U values for the whole element to save adding it all together - eg cavity brick with insulation, and plaster or whatever. A 10 yo house should have cavity wall insulation on construction. Lots of the online...

I think Tony and Dan probably understand that bit........ More to the point,there is obviously something pretty wrong with your boiler. Wires should not be melting, fuses blowing, having to bypass switches to make it fire. It doesn't really sound like you have the skills to troubleshoot...

It doesn't sound to me as if the plumber realised there wasn't any gas :-) I think you need to look around for someone who has specialises in or experience of your kind of system, as I imagine many won't have. Are you new to this property, or have you lived there for some time? It might...

Not cheap, but you could use these sensor switches: http://www.sensor.co.uk/switches/bathroom_switch/

AIUI, 11C temp differential was what was used with older designs of boiler. Modern condensing boilers are designed for a 20C differential

A garden tap doesn't need a drain, (unless you intend to leave it leaking and dripping all the time....). It was presumably over a drain used for other things as well. If it is over a hard surface, then don't worry about it, the little bit of water that will be spilt etc. from a garden tap...

Why would the cold go back up the hot feed? they are at the same pressure. It sound to me like this is one of those situations where people here ' some showers need a non-return valve' . They don't stop to consider why, and then it mutates into 'all showers need NRV' When I fitted a...

Ah, I see. Well it might well be that the system can't put out enough heat when colder outside. Some of the pro heating engineers around here should be more up on current practice, but when I did the design for the CH in my last house (1997) ISTR that the suggested external design temp was...

Best place for a thermostat is always a bit variable anyway. I don't like them in the lounge as that can often get warm esp. when there are a number of people, TV etc. on while the rest of the house is not up to temp. Made a bit of sense I guess when there were no TRV's , but nowadays it...

There is rather more to it than just room size to do the sizing properly, if you want to check, this site came up on a recent tread and seems pretty good. http://www.starsapp.co.uk/ AS well as the rads being the right size, the pipe runs need to be able to carry enough water to each rad...

Fortunately I'm not (in this context) giving professional advice, there is a disclaimer when you sign up to DIYnot, and in the end , my advice is worth exactly what was paid for it :-)

I think the Drytech ones are a different range (and maybe more recent?) . I think they are just badly written instructions, and have included a general warning, without actually thinking about the context.

It's probably work ok to start with, but I reckon it will ust lead to earlier failure and you having to redo it, and which point you've got silicone and PM to remove.. Anyway I reckon 10mm is a big gap to fill with silicone and have it look at all decent

Presumably a stone resin tray? They do need supporting across the base otherwise they might crack. Firstly, if the manufacturers recommend something, it might be wise to go with that for warranty purposes. I've used mortar, and works well and is easy enough - make up a weak mix,spread it...

If you don't think that quadrant tiles will work, how about some of that sealant strip, that you can get for sealing along baths etc. this kind of thing. If you want to fill behind as well first to make a good surface to stick it down to. I'd suggest two part polyester filler - aka car body...

Well, in the context of replacing the element I would read that as make sure that it is sealed properly afterwards. (Though it really just looks like one of those meaningless statements you get on things nowadays, obviously you have to unseal it to replace it.) Just do it as you are...

No, you don't have to take out a Green Deal finance deal for this. It was one of the ways the Gov has modified the scheme because of the poor tack up. You can get cashback on various things See the FAQ: https://gdcashback.decc.gov.uk/Home/Faq A few things to note from that, you have to...

Yeah what you complaining about :wink: all mine was stuffed into two pattress boxes, behind an FCU and a flex outlet, choc blocks a go-go :-) I wouldn't necessarily rip out all the wiring, but I would certainly use the opportunity to check it and replace any as necessary and rewire into a...

Yes, it is certainly worth getting pone fitted, esp. if you are suffering such condensation. I put one into the bathroom in our old house when I did the refit. Mine was a pretty standard 4 inch fan mounted in the loft above the bathroom, venting out through the roof (bit of soil pipe with a...

How close? John Guest recommend copper pipe for at least the first metre from the boiler. http://www.speedfit.co.uk/home/technical-support/faq-s.aspx