Greenhouse Heaters and Combustion
When choosing greenhouse heaters you might want to consider what type of heater combustion will work best for you. The combustion type of a greenhouse heater refers to where the air used for combustion comes from and also whether the burner is sealed or not. The burners can also be sealed or unsealed. It will be beneficial to understand the types of heater combustion available.
Open greenhouse heaters use air from inside the greenhouse and are fine for areas that will not have excess foreign matter present in the air. If the air is full of dust from mulch, wood shavings, or compost, the contaminants in the air can damage the heater. In rare cases, it can sometimes cause the microscopic matter in the air to ignite causing a fire. It can be a useful solution for a small greenhouse, depending on the circumstances. Greenhouse heaters that use separated combustion take air from the outside and therefore do not carry the dangers of open combustion heaters. The burner is also sealed completely so that only outside air is used to support combustion.
It will have an air intake as well as an exhaust pipe to the outside of the greenhouse. Separated combustion type greenhouse heaters are safer for greenhouses that may contain contaminants in the air. Sealed combustion type greenhouse heaters are similar to separated combustion types. They are also completely sealed so present no danger of fire in the greenhouse regardless of dust and debris. The main difference is that they use a direct vent for their intake and exhaust. Sealed combustion greenhouse heaters can be a good choice if you don't want to worry about contaminants in the air.
Understanding combustion types can be useful information in choosing greenhouse heaters. The different types work differently and are designed for different purposes. Knowing what each one does and how it works will be beneficial information when shopping for your greenhouse heater.