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Is a normal surface-mounted socket OK for a (brick) shed? The shed is connected to the kitchen with a covered, secure, "utility room" - ie. probably not an official indoor "room". I intend to run a spur from the kitchen ring-main along the brick wall of this utility room to the shed...

B&Q are currently doing 11W GE fluorescents (equivalent to 100W incandescent) for 98p each. Never had to replace one of these in many years of usage. Also it's nice rarely or never to have to change bulbs in complicated light fittings - worth the effort I went to to find the little spiral...

A friend of mine has a brand new 3-bed townhouse and uses 750 per year. Given that heating is only used about half the year, this sounds similar to what you are using. I use about half that for a bigger townhouse. The difference is that, like you, he has his heating on all night whereas mine...

The delta T number is the difference between the temperature of the radiator and the temperature of the room. Typically, room temperature is about 20C and radiator temperatures are 70-75C maximum (possibly less on a condensing boiler setup??). So output at delta T of 50 is a more sensible...

The barrier is there to stop oxygen working its way through the plastic into the water, and corroding your boiler and radiators. There are rules about how close to the boiler the plastic pipe is allowed to connect - check the tech specs. Because plastic is thicker than copper, the internal...

This sounds like it is probably what it is. It was hard to see, and it didn't seem sensible to pull it any further to see better. Thanks for your help.

While repairing a friend's leaky radiator, I found that the copper final connections to the radiators were attached to plastic pipe behind the plasterboard, but with no connector apparent. The microbore appeared to have been shoved up the 10mm plastic. The ends of the plastic are not...

If it is not too inconvenient it might be best to sort it but otherwise you could ask Citizens Advice Bureau. Or if you have paid for legal advice with your house insurance you may have access to a hot-line. They can be quite useful. You should also check your deeds to check the land...

Pros - 1. in a new build house, all plastic can be hidden behind plasterboard. Pipes come out of wall behind radiator so cannot be seen. Radiators can easily be removed and replaced during redecoration, often without detaching the valves. 2. in a retrofit, pipes can go through the middle...

I am not a plumber, but I have this problem in my house. Bigger radiators need a bigger water flow, so adding your 1200x500 double is like adding four or five 500x500 single panel radiators. If you check the specs for plastic pipe, Hep20 says "As a general precaution, Hep20 should not be...

http://www.cda.org.uk/Megab2/build/pub-150-copper-tubes-in-domestic-heating-systems.pdf It's a bit complicated though.

Well physics has got me a long way understanding the deficiencies of my system since the designers and installers of my ropey CH system refuse to tell me what is wrong with it. However, real-world knowledge is also essential and this forum has been very helpful. I have a Micron 60ff which...

I am not a plumber but... I'm currently in "discussion" with my housebuilder who used 12 metres of 10mm plastic to fit to a 400 x 1400 double radiator where the design asked for 15mm pipe. My system will only balance with a temperature drop of 15C and with lockshield valves on all other...

As a physicist, not a plumber, I agree with Chris R's first comment. My system matches a 14kW boiler against 10 kW of radiators and cycles at an appropriate ratio - about 3 minutes on, 2 minutes off. With regard to Chris R's second comment, if the water takes longer to cool (because the...

What is the size of the radiator? A pump might have trouble servicing a big radiator through 8mm pipe, especially 14 metres of it (7 metres there and 7 metres back). Presumably both radiator valves are fully open.

Some great suggestions above - speak nicely to the sales advisor to get some of the info as the builder will be less than forthcoming if they think it will involve extra work for them. (Is it a major builder?) I have 4500 BTU in my dining room which is 2/3 your lounge size (the heating...

Sorry I was a bit unclear in my other post. Basically, the more radiators you have, the more water the pump has to pump (the horizontal scale of the graph). The amount of water happens to be proportional to the total power of the radiators. Because I worked it out on my own system, I know...

If you have one radiator off, do the others all get "scorching hot"? Have you got your boiler manual? The performance of the pump (in diagram 4 of the manual off the Glowworm website) is dependent on required flow rate of water. What is the total kW of your radiators? "Several very large...

Well I got 7 litres out of a 1400 x 600 modern double panel.

For the record, found out my house was fitted with a product called Osmagold Wavin. Their internal diameters are almost the same as copper, and their technical info says what you say, that the surface characteristics overcome the slightly smaller resistances, and that copper data can be used...