New builds in the last 10-15 years now typically have “unvented” systems - you still have the combi boiler unit but instead of heating on demand, it circulates hot water through a coil in a mains-pressurised insulated tank. The advantage of this is that cold and hot water are both at the same pressure, and you don’t have to wait for the combi to kick in once you open the tap.

I've never met anyone in Sweden burning anything that isn't wood to heat things in their home (except the district heating, which burns our sorted trash) in a central location. And the people burning wood usually only do it during the winter months when it's really chilly outside, else it's heat pumps or electric.

> These are often located in the kitchen

Also, traditionally, in an 'airing cupboard': a space where washed clothes 'air' before being put in drawers. There is a lot of variation.