House and garden

How to choose the right heaters for greenhouses


Each summer resident understands how important heat is for growing a variety of crops. It is also necessary in the greenhouse, and in order to extend the season as much as possible and collect several crops at once, we decided to choose and install a heater for the greenhouse.

Greenhouse heatersin a strong combination with the correct agricultural technology of plants and the right lighting, they will help to grow crops even in winter, and in early spring to receive strong and ready for further development in open ground seedlings.

Choosing a greenhouse heater

Heating of a greenhouse design can be so diverse that it is not difficult to get lost among the assortment of installations and special devices for raising, regulating and stabilizing the temperature. But today we decided to give preference to heaters - special devices, the installation of which will not hit your pocket much and will be able to provide a small or medium greenhouse with enough heat.

Choosing a heating device should be based on your own abilities to purchase, power and efficiency of the heater, heating quality and minimal heat loss, as well as paying attention to the special requirements and characteristics of the devices that you want to install inside the greenhouse.

When a heater is needed in a greenhouse

The answer to this question depends on many different factors, and therefore we will answer very simply - if you want to grow greenhouse crops with high quality, then a good heater is necessary all the time.

In the autumn period, temperature drops should not be allowed to be less than -1 ° C, in spring, air and soil temperatures should be stably maintained for the good germination and development of seedlings, in winter you need to keep the temperature stable, depending on the type and requirements of plants. Sometimes heating is necessary even in the warm season, at the end of spring, when the average daytime temperature reaches + 22 ° C and above, and at night the colds begin or freeze when the rainy season begins in summer and the soil temperature drops sharply. If you are seriously engaged in greenhouse gardening, and not just grow several bushes of tomatoes and cucumbers in a greenhouse, you will definitely need additional equipment for heating.

Which heater to choose for a greenhouse

By and large, it all depends on the requirements, as we already said. For example, if in early spring only seedlings freeze slightly, experienced summer residents use thick candles that are placed between rows of seedlings and set on fire. For a small greenhouse, where only a few hundred seedling bushes are grown, this will be enough to stabilize the temperature. If it is necessary to equalize just the night temperature, then many act differently. For example, at the end of the day in the country or in the countryside, a family dinner is prepared. At the same time, a certain amount of bricks, 5-6, and a bucket of water are heated on the fire of the stove or even a gas burner. With the onset of dusk or even before them, bricks and water are brought into the greenhouse or greenhouse and installed on wooden boards or beams. During the night, these objects give their own heat, while heating the room. And although in this case the temperature inside does not rise, but it does not fall.

You can use more advanced installations for heating greenhouses - electric heaters and gas heaters for greenhouses, but we suggest paying attention to infrared devices, and right now we will explain why.

Electric and gas heaters lose a huge amount of energy while they heat the space and objects in it to a certain temperature. They work locally, that is, they cannot heat everything around them, but only plants, air and soil in the direction of their work. In addition, this type of heating greatly dries the air, which is very harmful for some plants. Therefore, we propose to consider infrared heaters, the advantages and operation of which we will discuss in the next section of our article.

Candles in a greenhouse can not sufficiently warm up a large internal volume and show high costs, water and bricks work well only in small greenhouses, gas and electric heaters work strictly in direction and dry the air. This means only one thing - you should consider a more practical and economical type of heating units.

Infrared heaters for greenhouses

Experts and summer residents with many years of experience claim that heating the greenhouse with an infrared device gives us the opportunity to grow a much more stable and high-quality crop, harvest it faster and minimize heating costs, because IR heaters have a rather high efficiency.

After this statement, we all would like to hear about the main advantages of infrared heating:

  • High-quality and uniform heating of the entire territory with the correct installation of heaters;
  • Maintaining stable humidity, as the air does not dry out and is not burned during heating;
  • Serious suppression of the growth and development of bacteria and pathogens, reducing the number of infections;
  • Uniform distribution and supply of heat, which is very correct, because it eliminates temperature differences;
  • Reducing dust circulation in the interior of the structure;
  • The beneficial effect of the above factors on the growth and development of plants.

Features of the operation of infrared heaters in the greenhouse

  • It is very important that this type of heating system can be installed as you like - on the walls, on special brackets or racks, on the ceiling. The best solution is ceiling placement.
  • In addition, the units operate absolutely silently, they are compact and mobile, are installed without the involvement of professional electricians, which additionally saves money.
  • Correct installation of equipment allows you to set a uniform or different temperature in different zones, which means that now under one roof you can grow different crops with the same quality, each with its own temperature requirements.
  • You can always control the uniformity and quality of heating, for example, lowering the equipment lower when growing seedlings, and raising it higher when the plants begin to grow.
  • The main feature of the equipment is the initial heating of the soil, and only then air. This makes it possible not to lose expensive energy.
  • The air does not dry out, the heat is supplied to the plant soft and does not burn young greenery or flowering.
  • The equipment is equipped with temperature controllers, so you can always set the necessary mode for you, both for individual crops and for different phases of growth and development of one plant. Here, we immediately want to recommend equipment with separate relays for each device, so that the above works, otherwise, by using a general relay, you can set the same modes only for the entire greenhouse at once.
  • Newer and more modern equipment is significantly different from obsolete. The main difference is in the radiating surface, because the flat screen is now replaced with a spherical one, and ray scattering is possible up to an angle of 120 degrees. This allows you to save money and give the whole plant the same temperature.

Greenhouse heating

Calculation of infrared heaters for a greenhouse

Naturally, positive reviews about infrared greenhouse heaters come only from those people where this equipment works correctly and efficiently. Similar work directly depends on the correct calculation of heating systems, placement and connection.

For the calculation, we will not use the abstruse words used by equipment sellers to confuse us and promote us to more expensive systems, but we will tell you everything very clearly.

Consider a standard-sized greenhouse, say, 6x3 m. So, by choosing only two IR devices with a power of 1.2-1.5 kW, you can properly warm up all its space. Here it is necessary to choose not only power, but also the size of the devices. For example, heaters with a length of 1.7-1.8 m and a flow dispersion angle of 100-120 degrees can easily take on a heating zone 2.5 m long and 3 m wide. Even by the most crude calculations, you can understand that this will be enough for the construction of these dimensions. Naturally, for an increased area, it will be necessary to add devices or slightly change their characteristics.

If the width of the greenhouse is slightly larger, you can always go to another option - hang the heaters not in the center, but on both sides. For this, it will be necessary to take not 2, but 4 heaters. Power and other indicators, respectively, can be reduced by 2 times, but then you will be 100% sure that you are heating the entire territory.

Greenhouse heating

Heaters for greenhouses and greenhouses can be very different, but it is better to choose more modern and with a power reserve, because manufacturers do not always try to make a novelty attractive only externally, quite often additional upgrades are invested in similar equipment that really improve performance.

Heating in the greenhouse (20 photos)