A greenhouse heater would be perfect if you want to grow vegetables year round. You can find a range of greenhouse heaters such as vented greenhouse heaters as well as non vented greenhouse heaters in different sizes. A good heater is certainly necessary, especially if you live in a cold climate. There are many different kinds of heater on the market such as baseboard heaters, air heaters, floor heaters, propane heaters, outdoor heaters and more, so no matter what your space looks like, you're sure to find something that will fit your home perfectly. 
The Big Red Heater
"Imported from England, this powerful kerosene heater is ideal for greenhouses up to 150 SF. With a capacity of 4.0 liters of kerosene, this unit will provide up to 16 hours of continuous heat on one filling without any electricity. Perfect for emergency heating or as the primary heat source for any small greenhouse." 
Non-Vented Greenhouse Heater
"NO ELECTRICITY REQUIRED! Southern Burner Model C1 non-vented heaters have been used in greenhouses for over 70 years. The Model C1 is an open flame heater that does not need to be vented although it does require a fresh or combustible air intake form the outside of the greenhouse. Click on picture for pricing, model options and important product safety information."
These heaters can be found at greenhousemegastore.com
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