A steam boiler can be purchased online from a store that specializes in heating products, such as Fulton.com, or from a home improvement store, such as Home Depot. There are several types of steam boilers available, including vertical tubeless, horizontal firetube and multiport boilers.
Steam boilers are available in a wide selection of fuel sources, which include gas, propane, oil and combination units. Manufacturers offer indoor and outdoor models depending on the intended use. Merchants selling steam boilers also typically sell repair parts and accessories. Boilers are generally rated in BTUs, letting customers determine which size boiler will accommodate their heating needs.