Hi,

I am thinking of fitting my own Combi boiler and central heating
system(then a gas fitter connecting the gas).
Can anybody give me a simple overall description of how to do this.
1.We are thinking of fitting the new combi boiler in the bathroom,do i
simply connect a mains cold water supply to the boiler and tap in to
our existing hot water pipes with the DHW connection.
2.What size plastic pipes do you run for the central heating part,do
these reduce down at any point.
3.Do plastic pipes need lagging or are they thermally efficient.
4.I understand the need for a filling loop,what other stop valves or
relief valves are needed.
5.Do all combi boilers have a pump internally or do some not.
6.We are not planning on fitting radiators initially,can just the DHW
system be used then radiators connected afterwards.
7.Will any of our existing water pipes(hot/cold)to taps throughout our
house need replacing.
8.Do combi boilers come with installation/startup instructions for the
initial setup.
9.After the gas fitter has connected the boiler,should he set the
boiler up and check the hot water system or is this left to yourself.


From other posts i have read about DIY central heating it seems quite
possible with some DIY experience to undertake this job,i just need to
know of anything specific that should be done when fitting a system.