Water heater unit
AssigneeTakagi Industrial Co., Ltd.
InventorsKazushi Iwama, Akihito Yamashita
Life of this patent
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Abstract
There is provided a water heater unit realizing antifreezing of a water tube and the like of a heat exchanger without providing a backwind stopper on an exhaust tube. The water heater unit comprises a heat exchanger for heating water by a combustion heat of combustion means, water temperature sensors for detecting the temperatures of the water tube connected to the heat exchanger and an air supply fan for supplying air to a combustion chamber in which the combustion means is installed. When temperatures detected by the temperature sensors reach a temperature at which freezing of the heat exchanger is expected, the air supply fan is driven to supply air to the combustion chamber and the air is exhausted toward an exhaust port, thereby effecting heat exchange and antifreezing of the water tube.
Claims18
A water heater unit comprising:
- combustion means for combusting fuel (such as a combustion gas);
- a combustion chamber incorporating the combustion means therein and having an exhaust port for guiding combusted exhaust air produced in the combustion chamber to outside air;
- a heat exchanger provided with a water tube through which water flows and heating water which flows through the water tube by heat produced by combustion in the combustion means;
- temperature sensors attached to the water tube connected to the heat exchanger for detecting temperatures of the water tube;
- and
- an air supply fan for supplying air to the combustion chamber in which the combustion means is installed;
- wherein the air supply fan is driven to supply air to the combustion chamber when the temperatures detected by the temperature sensors reach a temperature at which freezing of water inside the water tube of the heat exchanger is expected, and the air from the combustion chamber is discharged toward the exhaust port so that the exhaust air warms the water tube.
Dependencies are inferred from the claim text.