GREENHOUSE HEATER

Description

Greenhouse Heater is an electric fan heater designed to maintain minimum temperatures in grow tents, greenhouses, and enclosed growing environments during cold periods. We have been recommending electric heaters to UK growers since 2017 as an important environmental management tool, particularly during the UK’s autumn and winter months when unheated growing spaces can fall well below the temperatures that indoor plants require for healthy growth and disease prevention.

Maintaining Growing Temperature During Cold Periods

Plant growth, nutrient uptake efficiency, enzyme activity and root function are all directly temperature-dependent. Below 15°C, most indoor crop plants slow significantly; below 10°C, growth effectively stops and cold stress begins. During lights-off periods in winter — when grow room lighting is not contributing heat — poorly insulated grow spaces in UK conditions can see temperatures drop dramatically, particularly in outbuildings, garages and loft spaces that lack active heating. A dedicated greenhouse heater maintains a safe minimum temperature throughout the dark period, ensuring your plants continue growing at optimal rate regardless of outdoor conditions.

The fan heater format circulates warm air throughout the growing space rather than creating a single warm zone near a radiant heat source — important for the even temperature distribution that prevents cold spots where mould and pest pressure can develop. The thermostat function (where included) prevents overheating by cycling the heater off when the target temperature is reached, improving energy efficiency and preventing excessive temperature swings.

Safety and Placement

Position the heater where its airflow can circulate through the growing space without directing hot air directly onto plants or vulnerable electrical equipment. Ensure the heater is appropriate for indoor horticultural use — look for IP ratings appropriate for humid environments. Pair with an environmental controller and thermometer for precise automated temperature management, and combine with good insulation practices to minimise heating costs during winter growing.