I have a combi boiler, and when it was new it was very good indeed: fuel bills down by 50%, although some of this is down to the old and inefficient boiler I had before. Things to check out / consider when buying one (in my opinion) : Cost and availability of spares parts (a simple pressure switch on mine costs £85.00+ tax, a realistic price would be £20-25, a diverter valve, a common failure in combi boilers, is £280+tax, half the price of the boiler when new). Get the largest capacity boiler you can (within reason). Prices of some boilers on special offer at some plumbers in UK might seem attractive. Speak to a plumber who knows. What you really need is a plumber who's a musician / singer. I know a couple in UK. PM me for details. My comment that my boiler was very good when new would suggest it ain't too good now. That's right. I've had some failures that really should not have happened, but they did. Expensive, for MY boiler. Not so bad for other makes. I still really like combi boilers, and would certainly have another. John