A device for delivering a liquid heated to a desired temperature under pressure in a microwave oven, the device comprising: a first chamber adapted to receive and hold a first volume of a liquid, wherein the first chamber is configured such that the liquid in the first chamber receives a first amount of microwave energy produced by a microwave oven during a period of time; a second chamber adapted to receive and hold a second volume of the liquid, wherein the second chamber is configured such that the liquid in the second chamber receives a second amount of microwave energy produced by a microwave oven during the period of time, wherein a ratio of the second amount of microwave energy to a mass of the second volume of liquid is less than a ratio of the first amount of microwave energy to a mass of the first volume of liquid; a vapor flow path from the first chamber to the second chamber; characterized in that the device further comprises: a liquid/vapor flow path from the second chamber to a destination outside of the second chamber; wherein, when the liquid in the first chamber reaches its boiling point from receiving the first amount of microwave energy and at least partially turns into a gas, at least a portion of the gas flows through the vapor flow path from the first chamber into the second chamber, thereby increasing a pressure in the second chamber; and wherein the increased pressure in the second chamber forces at least a portion of the liquid in the second chamber through the liquid/vapor flow path from the second chamber to the destination outside of the second chamber. a first chamber adapted to receive and hold a first volume of a liquid, wherein the first chamber is configured such that the liquid in the first chamber receives a first amount of microwave energy produced by a microwave oven during a period of time; a second chamber adapted to receive and hold a second volume of the liquid, wherein the second chamber is configured such that the liquid in the second chamber receives a second amount of microwave energy produced by a microwave oven during the period of time, wherein a ratio of the second amount of microwave energy to a mass of the second volume of liquid is less than a ratio of the first amount of microwave energy to a mass of the first volume of liquid; a vapor flow path from the first chamber to the second chamber; characterized in that the device further comprises: a liquid/vapor flow path from the second chamber to a destination outside of the second chamber; wherein, when the liquid in the first chamber reaches its boiling point from receiving the first amount of microwave energy and at least partially turns into a gas, at least a portion of the gas flows through the vapor flow path from the first chamber into the second chamber, thereby increasing a pressure in the second chamber; and wherein the increased pressure in the second chamber forces at least a portion of the liquid in the second chamber through the liquid/vapor flow path from the second chamber to the destination outside of the second chamber. a liquid/vapor flow path from the second chamber to a destination outside of the second chamber; wherein, when the liquid in the first chamber reaches its boiling point from receiving the first amount of microwave energy and at least partially turns into a gas, at least a portion of the gas flows through the vapor flow path from the first chamber into the second chamber, thereby increasing a pressure in the second chamber; and wherein the increased pressure in the second chamber forces at least a portion of the liquid in the second chamber through the liquid/vapor flow path from the second chamber to the destination outside of the second chamber.