Reduce the Risk of Cracking Stove Glass

Stove glass cracking is annoying so doing a few things to help avoid a glass break or crack would be great. Fortunately for you, we have created a guide that reduces the risk of the glass from cracking.

Don’t tighten the catches and hinges

When fitting the glass, make sure you don’t tighten the hinges and catch on the door too tightly as this can cause excessive stress on the glass and break. You also run the risk of the glass expanding when the fire is on. Then the glass may break. It is also advised to have any form of rope as a buffer to protect the glass from the metal frame as this can cause stress cracks due to lack of support.

Don’t overload the firebox 

When loading the firebox, make sure you don’t add too much wood. Adding too much or adding long pieces of wood can cause the glass to break. As the fire gets going bits of wood can push against the stove glass and break the glass. Before you start the fire, carefully judge the amount you are adding to the firebox. 

Don’t burn painted or treated wood

Wood that has chemicals on it such as paint or treated can seriously harm your glass. This type of wood releases chemicals that dry wood doesn’t. The glass will become murky and cloudy as the fire releases the moisture. Don’t burn fuels such as paper, plastic, house coal and damp or unseasoned (green) wood. Ideally, you should cut and chop wood and leave to air for over a year.

Don’t put cold liquids onto a hot stove glass

Last on the list for preventing glass cracks and breaks is a simple one. Don’t apply cold liquids on the hot glass. Don’t apply water to cool down the stove. Let the stove naturally cool down. This is definitely the safest and easiest way.

Reduce Crazing

The mark you see in the bottom left corner is called crazing. This is small, hairline cracks on the glazed surface of the ceramic glass.

It’s important to note that crazing does not indicate a fault in the glass itself. Instead, it is a reaction to certain external conditions, specifically the way the stove is used and the type of fuel burned.

Crazing is typically caused by unburned acidic condensates etching the ceramic glass. This can occur when the fuel used has a high sulphur content or when manufactured smokeless fuel products containing high sulphur levels are burned. These substances are particularly damaging to stove glass and should be avoided.

Moreover, operating your stove in a manner that results in incomplete combustion—such as slumber burning overnight, using a smaller fuel load than recommended, or turning down the stove for extended periods—can lead to the creation of sulfuric acid. This not only damages the glass but can also affect the flue liner.

To help prevent crazing and ensure your stove operates efficiently and safely, we recommend the following practices:

  • Clean and dry the stove glass before use.
  • Burn only the fuel types recommended by the manufacturer.
  • Avoid burning fuels with high sulphur contents, such as Petcoke.
  • Avoid slumber burning.
  • Do not fully close the secondary air to maintain proper airwash flow.
  • Ensure that the fuel is dry; avoid burning wet, unseasoned, or processed wood.
  • Prevent ash buildup on the lower part of the glass.
  • Use a stove pipe thermometer to ensure efficient burn
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