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Class Information
Number: 236/24
Name: Automatic temperature and humidity regulation > Closed fluid heaters > Combined thermostat and flow controlled > Two or more valves
Description: Devices in which the heating means, usually a gas-burner, is controlled by the combined action of a thermostat in the fluid heated and a flow-motor operated by the flow of the fluid heated, the thermostat and motor operating on separate valves.

Patents under this class:

Patent Number Title Of Patent Date Issued
7025281 Programmable thermostat incorporating air quality protection Apr. 11, 2006
6024290 Fluid tempering system Feb. 15, 2000
4702306 Apparatus for controlling a process variable of a flowing medium Oct. 27, 1987
4564003 Solar/gas heater Jan. 14, 1986
4346835 Instantaneous water heater gas control valve Aug. 31, 1982

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