Not too worry, dear Northman. I think it is hot water heating then. I was just curious because of the extreme cold at times.
A lot of houses and apartments here have gotten heat pumps which are suppose to be more efficient and use less hydro. They work by transferring heat from cold air outside your home to the inside of your home and they also double as an air conditioning system in summer. Most people have a second heat source too. Wintertime costs lots to keep warm.
Have a great Thursday! 😊