Thermosiphon.
(OfThermo - and thelat.)(dosipho, - onis, and this of theGr. s? f?).
1. m. device attached to a kitchen and serving to heat water and distribute it through pipes to the toilets, bathrooms and battery of a House.
2. m. device of heating via hot water which is piped to various premises of a building or elements of a machine.