Heat exchanger and production method therefor

A heat exchanger comprising

• an assembly of a plurality of same-shaped heat exchanger units, each of the heat exchanger units comprising a heat exchanger core and a pair of tanks, wherein
• each of the heat exchanger cores comprises a plurality of tubes having fins, the tubes being arrayed in parallel,
• a respective one of the pair of tanks is arranged at each respective end of the heat exchanger core of the heat exchanger unit at a respective end of the arrayed tubes and operatively connected to the heat exchanger core for flow of fluid between the tank and the heat exchanger core,
• the plurality of units is stacked in a thickness direction of the units, which direction is orthogonal to the arrays of the tubes,
• the heat exchanger is configured for supplying a heat exchange medium to each of the tubes of each of the heat exchanger cores via one of each of the pair of tanks, and for an airflow to be conducted across a plane of each of the heat exchanger cores,
• at each end of the stacked units a respective header is provided for connection to each of the tanks at that end for flow of fluid between the header and the tanks at that end,
• each of the tanks and the headers is configured from a respective pipe member,
• each of the tanks of each of the units has an opening facing away from the core of that unit,
• each of the tanks of each of the units has a length at right angles to a length of the tubes of that unit and the opening in each tank is at a position on the length of that tank different from that of each adjacent one of the tanks,
• the respective header for each of the pair of tanks of the stacked units has a plurality of connection openings configured to match the respective tank openings of the stacked units, and
• each pair of the matched openings are connected with each other via a respective connection pipe.