Warm Morning heaters were designed to burn any grade of coal, coke or wood. The heaters were manufactured and sold by the Locke Stove Company in the 1940s.
The Locke Stove Company was based in Kansas City, Missouri, and made wood, gas and oil heaters until it closed in the mid-1980s. The rights to the Warm Morning name were acquired by Martin Industries in 1990. Martin Industries manufactured Warm Morning stoves, parts and a propane-fueled version of the stove until the company went bankrupt in 2002. Since then, there has been no production of Warm Morning stoves or parts. Some models and parts are still available online.