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Thanks again Hugh for your advice, based on which,together with my further online research today, has made me decide to try hard to design my project to enable use of 4" soil pipe all the way !!

Thanks Hugh. I was aware of what you are advising, but I didnt express my question very well. I intended to allow the pump/macerator system to raise the waste up to the most appropriate height for the beginning of the run. I want to have the pipe run attached to our boundary fence and almost...

Is there a satisfactory way of me installing an outdoor w.c. about 70 feet horizontally from my soil pipe, without using the "normal" macerator which pumps into a quite small diameter outlet . I would prefer to use a larger diameter macerator/pump outlet pipe ( but not a full size soil pipe) to...

Well guys, thanks for the replies. I went ahead and fitted my blue expansion vessel, precharging it to 1.25 bar instead of the 3 bar it needs for a sealed hot water cylinder system. I attached it to the new Viessmann vitodens 100-w 35 kw combi I have just fitted. As my system has 9...

Thank you bengasman for your attempt at a helpful explanation which I find totally unhelpful unfortunately. I suggest you learn to read english before suggesting I do not know what I am doing. Any large system in terms of volume of water in rads can require an larger than usual expansion...

I need to add another 5 litre expansion vessel to a new combi,as there are a lot of radiators. As I have a spare hot water one (blue) the right size, and don't need it for anything else, can I use it for the heating system. Or will the rubber diaphragm perhaps not like the C.H. inhibitor ?