As of September 2015, Dey Distributing, Mountain View Hearth Products, Amazon.com, and Rocky Mountain Stove and Fireplace sell thermopiles for Heat & Glo stoves online. Dey offers a single thermopile replacement part. A photograph of the device on one-inch grids shows the part's size.
Mountain View Hearth presents two thermopile size options. Each fits several Heat & Glo stoves. Amazon has a few choices of thermopiles. Both retailers display user ratings and reviews for the products. Rocky Mountain supplies a 750 millivolt thermopile that is compatible with a Heat & Glo model. A thermopile helps gas move from the main gas line into a stove's burners.