This Coldframe single paraffin heater from Nature has a fuel capacity of 4.5 L and generates heat comparable to a 600 Watt electric heater. Paraffin heaters are a good, economical way to generate constant radiant heat in the greenhouse. This warmth is essential to get sensitive plants, such as tropical and carnivorous plants or fuchsias or pelargoniums, through the winter. When the flame burns, water vapor is released, which humidifies the air in the greenhouse. The combustion also produces carbon dioxide, an essential element for plant growth.