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I recall Worcester releasing a tech article which allowed the use of 15 mm gas pipe on the 12 and 15 ri. 18 ri and above must have a minimum of 22mm ( think they state that no part of gas pipe is allowed to be smaller than the inlet connection. I am a Worcester accredited installer, I dont have...

Hopesomeone can give me a bit of advice, ive had the rear of my house rendered last year and then painted with external paint. We now have thick brown rust marks running down from the beading through the white paint and it looks terrible. My colleague spoke breifly to a plasterer yesterday and...

read part L of building regs. should cover seperate zone required due to building improvements etc

Are your rads heating up?

I quoted to fit a uv cylinder last year, customer had been all over Internet and had found plumb nation and cylinder was cheap cheap cheap. Phoned my pc branch and they couldn't get anywhere near it. Anyway cust bought it from plumb nation. 2 days later I'm stood in his house waiting for...

Press spanner button on boiler for 10 secs. Boiler will fire in service mode for 15 mins. Sorry not sure on Siemens stat as I don't fit them. But do what I said an at least you'll get some heat, someone else may be able to help with the stat.

Told you

20 pager NFQAT

No problems just mean that it is down to installer. If you go with a big company then you get what you pay for. Granted you may feel safer etc I agree with that. I have a local installer who undercuts me by approx £400-£500 when we quote on same jobs. He has been reported to gas safe at least 5...

Sorry don't buy the 'some local companies tend to disappear etc' Any installation will be covered by the manufacturers warranty, we cover all work for twelve months aswell. If your installer did go bust then you would retain the warranties direct with the manufacturer. Spend your hard earned...

no i would ask them to put a 30 CDI boiler in instead as its a better boiler and just pay the additional cost. ( not a lot ) WAI will give you six years warranty at the mo aswell

I found a prv on the loop of a Vaillant a few years ago. Boiler had failed expansion vessel, local rgi had fitted prv to top up boiler automatically!!!! Quality

Use above figures from lumon. Then get your heat loss calc from your architect. If heat loss is equal to or less than ufh output then it's ok. If heat loss is more than heat output then ufh becomes background heating and you should also have additional heating, ie rads