Flex King Vs. Flex King Pro

Many people see our Flex King and Flex King Pro chimney liners and wonder what chimney liner is best for their application.  There is no one answer that fits all.  Lets talk about when you would use a Flex King or a Flex King Pro first for a wood stove, then an oil furnace and finally a gas furnace.  You can clearly see the differences between the Flex King (on the left) and the smooth inner wall Flex King Pro (on the right).

Flex King Pro for Wood stoves

Generally we will say Flex King Pro is the best liner for wood stoves.  This is because it has a smooth inner wall.  That smooth wall creates for better draft and less creosote build up.  So if you plan on using your wood stove for more than just the occasional fire, the Flex King Liner is what you want.  If you are not going to burn your stove regularly, possibly just here and there on weekends, the Flex King will work just fine for you.  One thing you need to use, no matter what liner you install for your wood stove, is insulation.  Click here to learn why it is required.

So the verdict is if you burn more than here and there, install the Flex King Pro for your wood stove.

Flex King or Flex King Pro for Oil

Oil furnaces can go either way.  Sometimes it is recommended to use a Flex King Pro and other times a Flex King.  This is mainly determined on how well the furnace burns.  Sometimes an oil burner can be sensitive to draft, especially when the chimney is shorter than normal.  Sometimes the oil burner does not burn very clean and creates a thick soot in the chimney.  This can lead to a blocked chimney.  We highly suggest hiring a furnace specialist to clean and adjust the furnace immediately.  So if you have no issues with draft, your chimney is plenty tall enough and the furnace burns clean you can use the Flex King chimney liner.

Flex King for Gas Furnaces

The modern gas furnaces burn fairly clean.  When there is perfect combustion water is one of the by-products.  This is not just any water, it has acids within it.  This is no good for masonry chimneys.  The masonry will soak in the water and the acids will quickly eat away at the terra cotta flues and the bricks or blocks.  To prevent this damage you need to install a Flex King chimney Liner.  Some high efficient furnaces have cooler exhaust temperatures so the water condenses quickly inside the chimney.  In rare cases the water condenses at such high rates inside a cold chimney, water can be seen leaking out of the bottom of the chimney.  If you have this problem, you will need to insulate the chimney liner to keep that water inside the chimney as a steam.  This will prevent it from condensing and causing more problems.

If you have further questions, please contact us. We will help you decide what Flex King Liner will be best for you.

phone: 1-866-941-5112         email: [email protected]

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