We have a Stanley Range which does heating, hot water and cooking. When we refitted kitchen a few years ago (range was already there, and the only thing we didn't touch) loads of people told us I'd want an extra hob, but I ignored them and was right to! We have an electric steamer which can always be used if cooking masses for the masses!
The ovens aren't huge though so I did get an additional large electric oven fitted. They might make bigger versions, but as it was here when we moved in we haven't investigated that.
Agree that it can get hot in summer, but we had the wiring changed on ours as it was connected up in an odd way, and now just have it on in summer to heat water for an hour or so in the morning and another hour in the evening. Then if I want to cook I just have to wait a little while for the cooking parts to heat up.
In winter when it's on more, the bedroom above the kitchen gets really, really hot though!
Actually more of a problem can be the boiler part overheating in winter, so that when I decide that I want the oven on hot, it actually won't heat up because the boiler has reached maximum temp! Doesn't happen often though.
We have to have one radiator that can't be turned off, which is used to vent excess heat - I presume that this is standard for such systems. We just put a big heated towel rail in the main bathroom for this purpose.
Ours is oil fired, which as others have already said, is flippin expensive at the mo. Reckon we spend well over £1k per year on oil (only 2 of us, but largeish 4 bed house and we often work from home so have heating during day in winter).