200 BC: Wealthy Romans invent central heating as underfloor heating
13th century: Monks invent heaters for their monasteries
15th century: Fireplaces ensure clean heating in rooms
1716: The first hot water heater is invented for a greenhouse
1843: The first steam heating system is installed in a German castle
Approximately 1900: Coal stoves heat rooms using direct fire in the oven
1960s: Central heating systems displace coal and gas stoves in many places
From 2014: Heating systems are becoming smarter and more ecological - such as by using thermostats