Patent ID: 7658222

Claim:
A method of heating comprising: providing a building; providing a portion of the building arranged to act as a storage location; providing a plumbing system for the building including a waste material drain system for draining liquid waste material from the building; providing a septic tank arranged to receive the liquid waste material within which anaerobic bacterial activity occurs to breakdown the liquid waste material; and maintaining the portion of the building at a temperature above Zero degrees Celsius (freezing) and below twenty degrees Celsius by providing a heat transfer system for transferring heat from the septic tank to the portion of the building; the heat transfer system including a pipe containing a heat transfer liquid and a pump for transferring the heat transfer liquid through the pipe as a closed loop; arranging a portion of the pipe in contact with the septic tank to extract heat therefrom and a portion of the pipe in the building so that heat extracted into the heat transfer liquid from the septic tank escapes from the pipe directly into the portion of the building so as to heat the portion of the building to a temperature no greater than the temperature of the heat transfer liquid; and maintaining a temperature of the liquid waste material within the septic tank above an operating temperature at which the anaerobic bacterial activity occurs by arranging the portion of the pipe in contact with the septic tank to extract heat from an upper part of the septic tank above the waste material so as to avoid extracting sufficient heat from the liquid waste material in the tank to cause the anaerobic bacterial activity to halt.