Hi all; my wife has advised me that we are getting a new bathroom suite! she
would like one that has the taps in the wall rather than on the bath itself.
The shop told her that we cannot do this at present as we only have a
Gloworm Ultimate 50 boiler and an immersion heater, and not a combi.
Couple of questions that I would like some help with please.

1. Does a combi need any more ventilation space around it or external
venting than the present boiler (which is situated in the kitchen behind a
false cupboard door)?
2. Can I run the central heating via a combi?
3. Cost wise, will a combi work out more cost effective than the current
boiler/immersion setup?
4. How much should I be paying for a decent combi, and any recommendations
on make and model etc?
My wife likes lots of baths, so the immersion is on quite a lot, and
obviously the central heating is now on a fair bit. To give an idea on
costs, our electric bill per month is £52 and the gas is £36. I am in the
process of swapping from British Gas for both to Powergen, saving £200 per
annum, but that's another story :-).
Any help appreciated,
Regards
John