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I have no idea what the OSG is.

I need to cut some holes in my joists for rewire and have the following questions: 1) - What size holes should I cut and how many wires is it safe to feed through them. (I'm doing both ring main and lighting circuits) 2) - Where abouts in the joist is safe to drill so not to weaken the...

Someone recommended one to me , but this make is not listed on www.boilers.org.uk so I'm guessing it must be a model name. I have searched on the web and can't find any info. The model mentioned to me was a condensing boiler with combined unvented cylinder. Can you guys solve this...

No I didn't - I don't fancy open wallet surgery once a year :shock: Help me out here then - what system would you recommend for me - I've currently got a 3bed , 1 bath , 1 shower but will be extending to 5 bed with an additional bath and shower. A combination of baths and showers will be...

Thanks for your answers. I am aware I can increase the 15mm to 22mm , but its the loss of performance I worried about. I wasn't sure at what point between the mains inlet and the cylinder to get the pipe increased. It seem like a bit of a juggling act between increasing flow rate but losing...

I want to get gas central heating installed (currently have electric) and planned to have an unvented , indirect system. The problem is I only have a 15mm mains water and all of the cylinders I have seen (megaflo , ariston etc) require a 22mm mains connection. Should I pay to have a new...

Can I fix a consumer unit directly to an internal brick wall (painted) or does it have to be mounted on a fire proof board? If the later, would a piece of plaster board be OK? (If this topic has already been covered please advise of links as I couldn't find any) many thanks.