The Rinnai seems an interesting solution. I have a Worcester 924 boiler that was removed during the renovation and is in OK condition.
1) Could I use this as the central heating boiler with the Rinnai for hot water?
2) Is this a good model of boiler, and will it run 10 rads?
3) Is it legal...
Thanks for all the replies so far!
Yes, physics/flow/pressure was never my thing at school!
The shower flow rates I have estimated from doing a crude trial - I ran the shower at a good rate for 10 seconds into a measuring jug - it was 2 litres, so that's how I got 12 litres/minute. If I could...
I really need some help as I'm a novice at this...
I need to install a new hot water and CH system for my 4-bed house, which is currently gutted (i.e. easy to install pipes in floors etc).
As well as central heating with 10 rads, I want the capacity to run two big showers at once for 15 mins...