Modern wood heaters use a clear ceramic material instead of the tempered glass that older fireplaces used. It will not break with heat generated by wood burners, but it can break if the fasteners are over-tightened or if it is struck hard with a poker or piece of wood.
Here is the glass, with gasket installed, being mounted in the door frame.
The glass must be sealed tightly to the door to prevent air leaks. This is normally done with a flat woven gasket, usually with adhesive on one side. Clean the glass before installing the gasket. Remove the paper backing from a length of gasket and lay it on a flat surface, sticky side up. Center the edge of the glass along the gasket and press it into the adhesive. Now rotate the glass and press the next edge into the next length of gasket. Repeat until you get back to where you started and cut the gasket to the right length. Now wrap the edges of the gasket around the edges of the glass. The glass gasket may need replacement as often as the door gasket, but this depends on the design. If you see brown streaks on the glass coming in from the door frame, it usually indicates the need to replace the glass gasket.
Stove glass is very expensive, but should never need to be replaced. Some stove models seem to cause etching of the glass with normal use over time. You may wish to replace it to renew the clear fireviewing.
Regular maintenance and re-installing glass will require you to tighten glass fasteners. When so doing, ensure that you tighten them lightly, allowing room for the glass to expand when heated.
This ceramic glass is very stable and does not shatter, so if you crack your glass, you may be able to use the stove for a short term while you find a replacement. Replacement glass can be cut to size by a specialty wood heating store or sweep. Alternatively, you can buy replacement glass supplied by the stove manufacturer.
Some EPA certified stoves use specially coated glass. Check your manual. If this is the case, you can buy replacement coated glass from a dealer. Coated glass has a special side facing out. Check it and ensure you are installing the right way out.
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