OEM Gasket or No?

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Lots of Hearth shops or chimney sweeps have replacement size gasket for most stoves. Its not absolutely necessary to get OEM, but its not bad to either. The important thing is to get the right size gasket, and ensure it fits correctly.
 
There is no standard size, density, construction methos, or "crush" strength when it comes to door gaskets. On many stoves the OEM gasket is the only one that will work properly and this is a very important gasket to maintain control of your stove's burn rate.

I would and do pony up for OEM for door gasket. I am more than happy to buy aftermarket on other things like catalysts.
 
Perhaps worth getting the OEM. Not a big expense and it eliminates any doubt afterward. That said, my local stove shop did not carry OEM and what they carried worked fine for my Jotul insert.
 
Even if you do get oem you can screw it up at install if you stretch or bunch it excessively. Or if you don’t use a thick bed of rtv.
 
Some stove's can work ok with a third party gasket. Others definitely do not. There is a lot of variation in gasket construction. And there are differences in how they seal (knife edge or flat face). Gasket rope may look the same, but some, like Lopi and PE's are actually more complex, almost like a rope within a rope. I don't know about the door seal on the H300 but if it were me, I'd invest in the OEM gasket to keep that sweet stove running well.