A heat transfer plate comprising a first port opening (22) and a second port opening (23) for allowing a first fluid (F1) to flow over a top surface of the heat transfer plate, a first side opening (24) and an opposite, second side opening (25) for allowing a second fluid (F2) to flow over a bottom surface (89) of the heat transfer plate, a number of rows of alternating tops and grooves that extend along the heat transfer plate, where a transition between a top and an adjacent groove is formed by an inclined portion, and plate portions that extend along the heat transfer plate, between the rows of tops and grooves, thereby forming flow channels between the rows of tops and grooves.