central heating pipework

see current thread: Heat capacity of central heating pipes

That will be fine for starters

1. the myson.co.uk provides a downloadable program for sizing rads and brequired boiler ouputs. You calculate heat loss from the rooms by inserting sizes of walls, windows, materials etc.
2. my local library has a good section on plumbing and house building books
3. the above books tell yuo waht size pipes to use. Small 15 mm pipes can only serve rads outputs of around 6kW, 22m can serve 12kW? (get exact figures from books, or web sites/DIY faq).

4 My oil boiler, located at one of of my end terrace, has 28 mm to a T-pice next to the boiler. From this T-piece; a) 22 mm runs to the upstairs and then goes to 15mm when it enters the floor void (for 3 beds plus one landing rad), b) 22 mm runs through the kitchen (and kitchen rad) to the dining room rad and then changes to 15 mm for the hall and lounge. There is also a T-piece in the 22 mm near the boiler for a 15 mm run to the bathroom, at the back of the kitchen. This may give you some idea. Neil

I'll be selling my oil boiler and tank soon? :)