.~ Fuel controlled by boiler or water system condition
DEFINITION
Classification: 137/94
(under subclass 87.01) Subject matter in which a condition of the fluid in a boiler or water heating system controls the flow of fuel used for heating the boiler or water.
SEE OR SEARCH THIS CLASS, SUBCLASS:
386+, for liquid level responsive or maintaining systems.
468, for thermally responsive controllers, and see the search notes thereto.
SEE OR SEARCH CLASS
122, Liquid Heaters and Vaporizers,
448.1, and 449 for water heaters and boilers with automatic regulation of the fuel and water.
