You have a choice between the wood heater door seals and plastic door seal. Both have their own benefits but which one will work best for your heater? Well, that all depends on what you are using your heater for and how much you use it. Plastic ones are definitely lighter weight and are used the most often, as they can be easily installed.
However, it is important to note that they do not protect your wood from the weather. The plastic door will not prevent moisture from getting into your house either as they cannot stop condensation from entering your house even if they are properly sealed. If you have a wood fireplace, the wood will warp and split due to moisture escaping out of the wood. So, when it is time to replace the wood heater, you need to get wood door seals for wood fireplace and not the plastic ones.
Wood door seals are very easy to install and use. All you have to do is screw them on the wood opening before you close the door. They also come with a wood sealing compound so you will not have to bother with it again. Wood door seals are not heavy duty as plastic ones are and you will notice this once you install them. Once they are in place, you do not have to worry about them anymore.