On 27/10/10 09:23, The Natural Philosopher wrote:


The only 'combi' I have used that really worked for hot water, was the one my
sister had in germany. It lived in the basement and was the size of a family
car. That actually could produce a hot shower.


Vaillant 24kw combi & Deva Thermostatic mixer works fine for us.

If the OP is in a hard water area, how hot does the water come out of the hot
tap if you turn the water temp control on the boiler up to full. It should be
way too hot to put your hand in (assuming no thermostatic mixers), above
65degrees C.

If it is not and you're in a hard water area, check the secondary heat
exchanger in the boiler isn't scaled up. That can make a world of difference.

A working, scale-free combi is fine for a good hot shower, even in cold
weather when the incoming mains is colder.