A rule of thumb for determining how much chimney you need for proper woodstove performance is…
Pellets, like conventional wood, differ in variety and some wood species perform better than others. It has been our experience that burning premium grade pellets, like fir, provide for more heat, less ash and less sooting due to moisture content. Though they tend to be more expensive they will most likely save you money in the long run as you will require less fuel and maintenance
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Chimney systems by code need to be installed once a transition through a combustible (roof or wall) is required. Once the transition to chimney is made the chimney system must be completed through to termination (chimney cap). As well, an insulated chimney serves two purposes; one is to insulate the flue gases from combustibles and second is to keep the flue gases as warm as possible. If an un-insulated pipe is fixed atop a proper chimney the warm gas are prematurely cooled and can result in poor draft and excessive creosote.
