Antifreeze system for instant water heaters
AssigneeAcorn Engineering Company
InventorsDonald E. Morris, Robert L. Wheeler
Life of this patent
Estimating the term…
Abstract
An antifreeze heating system which prevents the freezing of water present in an instant water heater of the type having a primary heater which remains inactive under static flow conditions. A secondary heater is placed within an enclosed housing volume of the instant water heater, and electrically connected to a temperature-sensitive switch which activates the secondary heater when a monitored temperature, such as the ambient temperature, falls below a threshold value.
Claims21
An antifreeze system for use with an instant water heater of the type having a housing body which encloses a housing volume, a water conduit mounted within the housing volume with an inlet and an outlet, and primary heater means for heating water in the water conduit when water flows therethrough from the inlet to the outlet, said antifreeze system comprising:
- secondary heater means for heating the housing volume to prevent water from freezing in the water conduit;
- and
- a temperature-sensitive switch operatively connected to the secondary heater means, for switching on the secondary heater means when a monitored temperature falls below a threshold value.
An antifreeze system for use with an instant water heater of the type having a housing body which encloses a housing volume, a water conduit mounted within the housing volume and having an inlet and an outlet, and primary heater means for heating water in the water conduit when water flows therethrough from the inlet to the outlet, said antifreeze system comprising:
- secondary heater means positioned within the housing volume for heating the water conduit to prevent water from freezing therein;
- and
- a temperature-sensitive switch operatively connected to the secondary switch, for switching on the secondary heater means when a monitored temperature falls below a threshold value.
An improved instant water heater comprising:
- a housing body which encloses a housing volume;
- a water conduit mounted within the housing volume with an inlet and an outlet;
- primary heater means for heating water in the water conduit when water flows therethrough from the inlet to the outlet;
- secondary heater means for preventing water from freezing within the water conduit;
- and
- a temperature-sensitive switch operatively connected to the secondary heater means, for switching on the secondary heater means when a monitored temperature falls below a threshold value.
An antifreeze system for use with an instant water heater of the type having a housing body which encloses a housing volume, a water conduit mounted within the housing volume and having an inlet and an outlet, and primary heater means for heating water in the water conduit when water flows therethrough from the inlet to the outlet, said antifreeze system comprising:
- secondary heater means positioned within the housing volume for heating the water conduit to prevent water from freezing therein;
- and
- a manual switch electrically connected to the secondary water means to furning the secondary heater means on or off.
Dependencies are inferred from the claim text.