Double plate heat exchanger

A plate element comprising a first heat transfer plate and a second heat transfer plate, the first heat transfer plate and the second heat transfer plate being connected to each other to form the plate element, each of the first heat transfer plate and the second heat transfer plate being formed of a plate body with a main part with a heat exchanging portion formed with a surface pattern, wherein the first heat transfer plate is formed with a first set of openings in first extension sections reaching out from the main part of the plate body, and the second heat transfer plate is formed with a second set of openings in second extension sections reaching out from the main part of the plate body,

• wherein the first extension sections of the first heat transfer plate and the second extension sections of the second heat transfer plate are positioned such that the first set of openings and the second set of openings are not overlapping,
• wherein the first heat transfer plate and the second heat transfer plate are identical,
• each of the first heat transfer plate and each of the second heat transfer plate being formed of a single solid plate, and
• wherein each of the first and second heat transfer plates has no more than two openings.