Here in Riga, the heat to the apartment is from a series if power plants on the outskirts of the city that pump hot water through pipes into the city. Each apartment block taps into that hot water loop. Usually two heat exchangers in each building, one for hot water radiator heat, and another for hot water to sinks and showers. It's a heck of system for upkeep, with all the old underground piping, they are always digging up the streets, and since the heat is regulated at the heat exchanger in the basement, there is no control of the heat in most apartments. When you're too cold, wear more clothes. When it's too hot...open the window... But still the locals love to tell me how efficient the scheme is. Yeah, on paper it may seem like a good deal, but with the cost of the infrastructure, the upkeep and the PITA for apartment dwellers...I'd much rather pay the oil man and have my own thermostat. Any city folks back in the USA have the same deal? Guess there are some cities with the same deal, but this is my first go-around with this type of heating.