A water reservoir for an apparatus for humidifying a flow of breathable gas, comprising: a reservoir body forming a cavity structured to hold a volume of liquid, the reservoir body comprising a conductive portion provided at a lower portion of the reservoir body , wherein the conductive portion comprises a thermally conductive material and is adapted to thermally engage with a heater plate to allow thermal transfer of heat from the heater plate to the volume of liquid, wherein the conductive portion includes a bottom wall , a side wall extending around a perimeter of the bottom wall , and a peripheral interfacing portion extending laterally outwardly from the side wall , the peripheral interfacing portion being structured and arranged to connect the conductive portion to one or more walls of the reservoir body , and wherein the peripheral interfacingportion includes an inner portion (5156.1) extending from the side wall , an intermediate portion (5156.3), a sloped portion (5156.2) extending from the inner portion (5156.1) to the intermediate portion (5156.3) to create an offset between the inner portion (5156.1) and the intermediate portion (5156.3) so that the inner portion (5156.1) is out of plane with the intermediate portion (5156.3), characterized in that , the peripheral interfacing portion further includes an end portion (5156.4) that extends from the intermediate portion (5156.3), and the end portion (5156.4) is bent at a downward angle with respect to the intermediate portion (5156.3) to reduce a risk of leakage caused by cracks within a critical area of a thickness of the one or more walls due to a presence of a sharp edge at the end portion (5156.4). a reservoir body forming a cavity structured to hold a volume of liquid, the reservoir body comprising a conductive portion provided at a lower portion of the reservoir body , wherein the conductive portion comprises a thermally conductive material and is adapted to thermally engage with a heater plate to allow thermal transfer of heat from the heater plate to the volume of liquid, wherein the conductive portion includes a bottom wall , a side wall extending around a perimeter of the bottom wall , and a peripheral interfacing portion extending laterally outwardly from the side wall , the peripheral interfacing portion being structured and arranged to connect the conductive portion to one or more walls of the reservoir body , and wherein the peripheral interfacingportion includes an inner portion (5156.1) extending from the side wall , an intermediate portion (5156.3), a sloped portion (5156.2) extending from the inner portion (5156.1) to the intermediate portion (5156.3) to create an offset between the inner portion (5156.1) and the intermediate portion (5156.3) so that the inner portion (5156.1) is out of plane with the intermediate portion (5156.3), characterized in that , the peripheral interfacing portion further includes an end portion (5156.4) that extends from the intermediate portion (5156.3), and characterized in that , the peripheral interfacing portion further includes an end portion (5156.4) that extends from the intermediate portion (5156.3), and the end portion (5156.4) is bent at a downward angle with respect to the intermediate portion (5156.3) to reduce a risk of leakage caused by cracks within a critical area of a thickness of the one or more walls due to a presence of a sharp edge at the end portion (5156.4). <EOS>