Clare brand furnaces are no longer being manufactured. The Clare trademark was discontinued by its parent company in 2011. Parts for Clare furnaces can still be purchased on secondhand sites, such as Ebay, but as of 2015, complete Clare furnaces are extremely difficult to find outside of Canada.
Clare was a Canadian gas and oil furnace manufacturer that distributed products in the earlier half of the 1900s. It was also known as Clare Brothers. According to furnacecompare.com, Clare had been owned by several different parent companies, and was most recently bought out by International Comfort Products. ICP discontinued the trademark for Clare products in 2011.
A few separate parts for Clare furnaces can be found by searching on Ebay. Canadian parts company Amre Supply stocks some Clare furnace parts as well, some of which must be special ordered. Additionally, some complete Clare furnace units can be found used on the Canadian classifieds website Kijiji.ca.
U.S. Heating and Air Conditioning lists Clare Brothers as one of the brands it distributes. This distributor is located in Ohio and offers to ship furnace parts nationwide. It may be possible to find parts for a Clare furnace through such a distributor, the company is unlikely to stock a complete furnace unit.