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My stove is about 6 years old and still has the original door and glass gaskets. I am just wondering how often they should be replaced? Is it best to buy replacements direct from manufacturer, or are there other good sources? Thanks for your input.
As long as they're still in good shape, let em ride! I personally would buy from the manufacturer. You can check the door gasket with the "dollar bill" test. Close the door on a dollar bill. It should have a little resistance to being pulled out. Check the door all the way around.
Yes I'd call the manufacturer or dealer and just ask what size gasket you need. I did that mine and bought some material from the manufacturer and got enough for several replacements. They charged me no more than I'd have found on Amazon. I also bought a bottle of the exact adhesive they use.
In my stoves, and in 50 years of using them, I have never had to replace the window gasket. Not saying it cannot be needed, but I've never had to [or...so far]. But same advice goes: if possible, just ask the maker of the stove or the dealer.
After 6 yrs. of service I would inspect the gasket carefully and to the dollar bill test. If it passes and the fire still shows even, consistent burning, then it may be good for another season. If not, replace it.
There is more than just the gasket size at play. Density and inner construction are equally important. Asking the dealer can be a mixed bag. Several years ago, I got the right-sized gasket from a PE dealer, but they didn't have the OEM gasket in stock. Instead, they sold me their "top-quality" gasket from a roll in their service dept. This turned out to be a serious error. The stove overfired, requiring opening the door to tame it down. The dealer gasket was too stiff, allowing air to pass all around the door frame. I will only go OEM for the stove door gasket and strongly recommend that.