Exhaust structure for water heater

An exhaust structure for a water heater heating water with a combustion gas, comprising:

• an exhaust tube including an indoor end portion and an outdoor end portion and connected to said water heater at said indoor end portion, the inside of which is defined as an emission path for said combustion gas;
• an exhaust pipe greater in outer diameter than said exhaust tube, a part of said exhaust tube being introduced in the exhaust pipe;
• an exhaust terminal attached to an end portion of said exhaust pipe and having an exhaust port for exhausting said combustion gas to outside;
• and
• an exhaust straightening member attached to said outdoor end portion of said exhaust tube and having an opening portion for allowing said combustion gas to flow out toward said exhaust port, wherein
• said exhaust straightening member has a cylindrical circumferential wall portion having a first end and a second end and a lid portion closing said first end of said circumferential wall portion,
• said opening portion has a plurality of openings formed in said circumferential wall portion,
• the exhaust terminal has a circumferential wall and a ceiling wall attached to an upper end of the circumferential wall,
• the exhaust straightening member is configured to be arranged in the exhaust terminal so that the lid portion is positioned in a space defined by the ceiling wall and the circumferential wall of the exhaust terminal,
• the water heater is placed inside a building,
• the exhaust tube is implemented as a flexible pipe,
• the exhaust tube and the exhaust pipe extend from an inside of the building to an outside of the building, and
• there is a gap between an inner circumferential surface of the exhaust pipe and an outer circumferential surface of the exhaust tube.