In this sub-class, the following terms are used with the meanings indicated: [3]
"Water" includes other liquids; "air" includes other gases or gas mixtures; "water" and "air" always mean, respectively, the liquid and gas to be heated. [3]
"Furnace tubes" means tubes inside the heater wherein combustion is performed. [3]
"Fire tubes" means tubes inside the heater through which flue-gases flow from a combustion chamber located outside the tubes. [3]
"Heater" refers to apparatus including both heat generating means and means for transferring the generated heat to water or air. [3]
The distinguishing feature of the air heaters classified in sub-class Fulltext... Hierarchy... Expanded...F24H is that the heat is predominantly released to the air by convection, mostly by forced circulation of the air. The domestic stoves or ranges covered by sub-classes Fulltext... Hierarchy... Expanded...F24B, Fulltext... Hierarchy... Expanded...F24C may also be fired or electric air heaters but they release their heat to a considerable extent by radiation and only to some extent by natural convection. Attention is, however, drawn to the fact that all storage heaters are classified in Fulltext... Hierarchy... Expanded...F24H 7/00. [3]
Packaged or self-contained boilers, i.e. water heaters with control devices and pump in a single unit
F24H 1/10
·
Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
F24H 1/12
· ·
in which the water is kept separate from the heating medium