Replacement parts for Intertherm furnaces can be purchased through several online retailers, including eBay, as of 2015. The search results on eBay include a broad range of parts, from heat sequencer fan relays and control boards to heating elements and ignition control modules.
Buyers should check the make and model of their furnace before purchasing a new part and ensure that the part is suitable for the furnace. All listed items have photos attached, and most of the listings also include part numbers, which makes crosschecking much easier.
Shipping costs and the places that sellers ship to should also be checked carefully prior to making a purchase.