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Our priority is to ensure we get enough hot water. I do not know the flow rate of the rising mains except to say it is very high, we have the stop cock not fully open because of the high flow rate, this has been commented on before by plumbers and builders, so do not think we have any problem there.

Thanks for this, it all makes sense and is what the second guy said when he came, although he hasn't measured the pressure at the meter or boiler. The third guy that came last night has now worried me, as I had to mention a potential issue with the pipes, when he looked he just said "that looks...

Thanks for this, no idea what a pulled bend is though, he just said 90 degree bend to me was 0.3.

Sorry Tony, yes I don't fully understand all of this, its true. To be fair the guy from Worcester did say no more than a 1mb drop from meter (usually 21mb) to gas valve then another 1.5mb drop is allowed to boiler giving total of 2.5mb. I will specifically ask this when I meet with the third...

The quote says that this is the maximum we would pay, no hidden extras, but they do not mention the pipework at all in the detailed quote and have I have said there is no obvious or easy way to upgrade the piping. So if they haven't mentioned it, how can I trust if the pressure would ok and the...

Yes got a phone call from Worcester-Bosch yesterday following a query I sent them. They told me to subtract 0.3 for every 90degree bend from the gas sizing calculation. He did a rough calculation over the phone for leaving the boiler in the cupboard and none are suitable, although 440CDi is the...

Wow, OK I will read through the installation manuals properly. Thanks for your help. Can't upgrade the pipework as stated so now not sure what to do. May need to rethink location, could put a wallhanging boiler downstairs and connect up to the water supply and CH pipes in the cupboard upstairs...

Yes realised and corrected thanks! I am beginning to understand exactly what you mean! It is looking like the British Gas recommendation of the 440CDi would be the best option, assuming that the pipe length is OK. I need to get someone to measure the pressure at the boiler, will ask the guys...

Ok thanks very much, then I really do not understand why the local installer, who is on the Worcester-Bosch list of approved installers, would say that one is the best. Really confused now. Will see what the guys on Tuesday come up with! Can you tell me where you find this info, as would be keen...

I have a 3rd guy coming on Tuesday, but just wanted to get my facts sorted first! But you are saying the 34CDi is 3.7m3/h NOT the 3 that bolshy mentioned?

Thanks bolshy for your reply. Neither British Gas or the other installer have suggested checking the working pressure at the present boiler. We cannot upgrade the pipework from the meter as it goes directly under the house from front to back. There is no access. Only other option is to use...

H guys, this is my first post on here and would be grateful for some advice. I will try and give as much detail as I think relevant. We want to upgrade our boiler and have run into a few issues that has confused us. We currently have a Worcester Highflow 3.5 Open Flue floor standing boiler...