Peruse the advertisements for hot water boilers from an old 1913 Architectural Digest. These conveniences were a new technology for the public as the century started. As this century begins, we may see the emergence of a new technology to last a millennium.
The first commercial cold fusion technology is emerging as a hot-water boiler to make useful steam and hot water.
An old Architectural Record from December 1925, with no cover but otherwise in tact, contained eight advertisements for hot water boilers and a lone oil heater for domestic use in the US.
It’s amazing that, despite the technological advances, some things will never change. Hot water and steam are beloved by humans.