It's fairly common in eastern and northern Europe too. In my building there is a single heat pipe from the city, however each unit has it's own meter for cold w

It's fairly common in eastern and northern Europe too. In my building there is a single heat pipe from the city, however each unit has it's own meter for cold water, hot water (for taps) and hot water (for heating). The hot water meters are different in that the first measures the water flow, and the later measures the heat flow.