Heating apparatus
Heating arrangements and control systems therefor
High efficiency gas furnace
High energy saving heat exchanger for furnaces
Home heating system draft controller
Hot-water supply apparatus, anti-freezing method thereof,...
Hot-water supply apparatus, anti-freezing method thereof,...
Integrated furnace control
Interlock and forced air furnace and HRV
Limit switch control especially for warm air furnaces
Method and apparatus for centrally controlling environmental...
Method and apparatus for energy recovery in an environmental con
Method and apparatus for operating a furnace from a 12V DC batte
Method and apparatus for reducing thermal stress on heat exchang
Method and controller for determining carbon dioxide...
Method of starting a hot air furnace
Microprocessor controlled two stage furnace
Over-ride circuit
Overtemperature control
Self-correcting microprocessor control system and method for a f