Mirafount Waterer Heat TubeMirafount Waterer Heat Tube The Mirafount Waterer Heat Tube is designed to protect incoming groundwater from freezing by using a highly insulated polyethylene tube that maintains warmth as water passes below the frost line. Included are one 30 inch heat tube and three feet of 12 inch plastic drainage tile creates an effective heat well suitable for most climates. In colder northern regions, the system can be expanded with an additional 30 inch heat