Turbulator for heat exchanger

A turbulator inserted into a tube of a heat exchanger that heats water through heat exchange with a combustion gas for turbulence of the water, the turbulator comprising:

• when it is assumed that the water flows horizontally along a water flow direction along the tube and the combustion gas flows vertically from an upper side to a lower side to cross the tube, and a direction that is perpendicular to both the water flow direction and an upward/downward direction is defined as a leftward/rightward direction,
• a body part extending along the water flow direction, having a plate shape that is perpendicular to the leftward/rightward direction, and inserted into the tube;
• and
• an upstream side wing part protruding from an upstream side portion of the body part with respect to the water flow direction along at least one direction of the leftward/rightward direction and extending in a direction that is inclined upwards with respect to the water flow direction such that the water is guided to an upper side of the body part.