Growing Plants in Greenhouses

 Using Electric Heating

Whilst infra-red heating can help in greenhouses, on its own it will create too much top heat and not enough circulated heat and air.

  Our range of greenhouse heaters combine heat and airflow to create just the right environment for plants to grow whilst minimising hot and cold spots.

To keep a greenhouse frost-free, the temperature must remain above 0°C even in the corners. If the current of air does not reach into the corners, the temperature on the heater has to be set much higher than it needs to be.  What then happens is that a large proportion of the warmth goes up into the gable of the greenhouse, where it is not needed, while the corners may still dip down to minus temperatures.  This wastes heat and there may be a significant temperature difference between when the heater switches on and off, especially with cheaper thermostats.

Heating and Ventilation in One

Why have a heater with a high ventilation rate?

The ventilation rate is set at about 3.5 times higher than with conventional fan heaters. There are three reasons for this:

1. Because the air is always circulating rapidly, the input temperature can be low. This means there is no drying of the air or of foliage even close to where the air is coming in.

2. Because of the high ventilation rate, all the air is circulated. An even temperature is achieved throughout the greenhouse and high temperature differences (hot at the top and cold at the bottom) are prevented.

3. This keeps the heating within a reasonable temperature range and reduces drops in temperature due to heat loss to the outside.

Images used by permission.  

Poor Heating and Ventilation with Hot and Cold Areas

Leisure Heating Solution using Bio Green Technology

Product Range

Please visit www.leisureheating.co.uk for our range of specially designed for greenhouses and polytunnels

The fan setting
By using the fan setting, all the air in the greenhouse can be circulated even in the summer season. With the windows open and the fan on, the greenhouse can be cooled down. Air circulation in the summer is also necessary for the pollination of many flowers.

The fan
The low power consumption of only 30watts means it can be left on for long periods without using much energy. Low-maintenance ball bearings, metal blades, a built-in thermostat, extra anti-corrosion protection and an earth wire - these are the features that make this fan a durable, long term investment.

Our range of greenhouse heaters are made here in England or are imported from Germany.  They are all fully guaranteed and are all tried and tested by Leisure Heating Ltd