A catalytic stove traps smoke and other combustion byproducts in a coated combustion chamber (the combustor), where they ignite at a much lower temperature than normally required, which increases the stove's efficiency and reduces carbon emissions. A catalytic stove is usually considered a better choice as a primary heat source. However, the catalytic combustor requires regular cleaning and maintenance and may need to be replaced every five years at a cost of $100-$300 on average. Catalytic stoves cost about $500-$700 more on average than noncatalytic wood stoves, which are easier to use and require less maintenance. Noncatalytic stoves are often recommended as a supplemental heat source only.