Disclosed is a blood product heater for use in an organ care system to provide improved conditions for a transplant organ such as a heart. The blood product heater comprises a heater inlet, a channel and a heater outlet. The heater inlet for flowing a blood product into the blood product heater, has a tube having an inside cross-sectional area and an inside cross-sectional shape； and the heater outlet for flowing the blood product out of the blood product heater, has a tube having an inside cross-sectional area and an inside cross- sectional shape. The channel has an inside cross-sectional area and an inside cross-sectional shape and extends between the heater inlet and the heater outlet and formed between first and second flow channel plates. The channel has substantially bioinert blood product contacting surfaces comprising titanium for providing direct contact with the blood product flowing through the channel. The inside cross-sectional area of the channel is substantially equal to the inside cross-sectional area of at least one of the inlet and outlet and wherein the inside cross-sectional shape of the channel differs from the inside cross-sectional shape of the at least one of the inlet and outlet. The substantially equal inside cross-sectional area of the channel and the at least one of the inlet and outlet minimizes the disturbance of blood product flow through the blood product heater； and a first heater thermally coupled to the first flow channel plate for heating the first flow channel plate. A pump circulates heated blood product to the organ being preserved.
