A heating system for heating neonate nutritional liquid, including a heater and a control module. The heater includes a heating portion having serpentine shaped grooves for receiving a tube. The tube may be a serpentine feeding tube module, having a serpentine tube portion, or a serpentine feeding tube cassette, having a serpentine tube portion covered by a rigidly attached polymeric sheet. The serpentine feeding tube cassette may include a thermocouple to measure the temperature of the warmed nutritional liquid as it exits the cassette.