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There may be other options around, but I've not found them. I looked around a fair bit and there were one or two that I thought might modulate power the way the Stiebel Eltron one does, but Stiebel were the only company that could confirm that they were OK with a warm water feed and would work as a variable boost heater (their technical chap was very helpful and the reason I bought their unit). What you describe does sound like a simple and easy solution. The reason I didn't go for the 12kW version was only down to the capacity of my CU, I couldn't find RCBOs that were rated at higher than 50A for it and you need a 60A one for the 12kW version. If I was starting from scratch I'd probably fit a separate small CU just for the water heater, to avoid having a 50A load through the main unit.

Another wall has been rendered, and it's really starting to look like a house now. More on my blog at www.willowburn.net, look for the blog entry "More cladding and rendering"

Bought a cheap hoover from screwfix and me the wife and kids got stuck into it. A mist coat on the walls and ceilings will help to keep the dust down plus some weak PVA on the floor.

My thinking is I need 10mm copper for the LPG supply to the hob (can't do that in speedfit) so one coil of 10mm copper will probably do my LPG run and my kitchen hot water run.

Don't beat yourself up. This is VERY robust pipe and is imo belt n braces. The connectors that affix to the pipe are also extremely good in comparison to a regular compression or push fit coupler, so you'll have a very good install at the end. . I would use it again in a heartbeat, and would favour it over regular push fit.

500 is ample - you may want twin immersions though. Once a month or once a fortnight for leigionella is fine

I did one job in 16mm and I used it for all the hot, hot return, and cold runs. I used this as I had a lot of off cuts plus a couple of coils over and wanted to use them up. I doubt if I'd use this by design tbh but any push fit pipe will need converting to copper where it terminates, but I wouldn't want to have to source 16mm manifolds for hot and cold tbh. 15mn is the standardised size so I'd try and stick to it where possible ( so you don't have to keep converting sizes where required ). Much easier to stick to one discipline imho.

Mine is all in 15mm, with 15mm manifolds. Easy enough to get an all 15mm system and it makes converting to copper for any exposed runs easy (it's nice to have copper where any pipe is exposed, as plastic pipe always looks untidy, IMHO). No need for barrier pipe for water, either, barrier pipe (i.e.the stuff with a metallised layer to reduce oxygen migration) is only required for sealed systems where you need to keep oxygen out of the water. Oxygen is a good thing in supply water as it prevents the growth of anaerobic bacteria.