| CPC F24H 9/0026 (2013.01) [F24H 9/13 (2022.01)] | 4 Claims |
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1. A water heater connectable to an external air supply and exhaust pipe coaxially including an outer side air supply pipe and an inner side exhaust pipe, the water heater comprising:
a housing that houses a combustion device including a fan;
a connecting portion configured to connect to the external air supply and exhaust pipe, the connection portion including an outer cylinder and an inner cylinder projecting upward from an upper surface of the housing, the outer cylinder configured to take in air into the housing in association with driving of the fan, the inner cylinder being coaxially arranged in the outer cylinder, the inner cylinder configured for discharging combustion exhaust gas that has passed through the combustion device;
a first air supply and exhaust pipe coaxially including a first air supply pipe corresponding to the outer cylinder and a first exhaust pipe corresponding to the inner cylinder; and
a second air supply and exhaust pipe coaxially including a second air supply pipe corresponding to the outer cylinder and having an inner diameter larger than an outer diameter of the first air supply pipe and a second exhaust pipe corresponding to the inner cylinder, wherein
the first air supply and exhaust pipe and the second air supply and exhaust pipe are selectively connectable to the connecting portion,
the first air supply and exhaust pipe is configured to connect to the connecting portion by interpolating the first air supply pipe into the outer cylinder and interpolating the first exhaust pipe into the inner cylinder, and the second air supply and exhaust pipe is connectable to the connecting portion by externally fitting the second air supply pipe onto the outer cylinder and interpolating the second exhaust pipe into the inner cylinder.
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