Pumps for greenhouse mist systems

Misting systems have become an essential tool in modern greenhouses for microclimate control: they allow precise regulation of temperature and relative humidity and, in some configurations, also the distribution of plant protection treatments or disinfectants. The heart of an efficient greenhouse system is always the pump, which must deliver stable pressure to atomize water into microscopic droplets and a flow rate suited to the volume to be treated. In this in-depth article, we analyze the technical specifications that a misting pump for greenhouses must have, why pressure and water quality are critical parameters, and which solutions from the Hawk range best meet these needs. The central part of the article is dedicated to the XLTI series, the benchmark model for most professional greenhouse misting systems.

Greenhouse misting: what it's for and how it works

The use of high pressure for misting is a technology that has seen significant development in recent years in agriculture, because it transforms water into micro-droplets just a few microns in diameter, which evaporate almost instantly and draw heat from the air. In a greenhouse, this translates into three concrete benefits: adiabatic cooling during the hottest hours, relative humidity control to support crop growth, and reduced water stress on plants.

Efficient misting isn't achieved by simply "spraying" water: it requires sufficiently high pressure, typically between 40 and 80 bar, combined with calibrated nozzles that break up the flow. Only under these conditions do the droplets remain suspended in the air long enough to evaporate.

What specifications must a pump for greenhouse misting systems have?

A misting pump for greenhouses works under very specific conditions: repeated operating cycles during the hottest hours of the day, constant operating pressure, and often the use of treated water. For this reason, in addition to performance, operating life and compatibility with the system's real-world conditions matter a great deal.

The essential technical specifications are:

• Flow rate suited to the volume of the greenhouse, calculated based on the number of nozzles installed and the cubic meters to be conditioned. For example, flow rates between 15 and 50 l/min.
• Stable operating pressure, kept around 40–80 bar, because inconsistent pressure alters the droplet size and reduces cooling efficiency.
• Compatibility with demineralized, osmosis-treated, or otherwise treated water, frequently used in greenhouses to prevent limescale buildup on the nozzles and in the lines.

Added to these are quiet operation, which is important in greenhouses where staff work for many hours, and the availability of design variants suited to more complex fluids when the system also distributes plant protection solutions or liquid fertilizers.

Which pumps are best suited for greenhouse misting systems?

The pumps best suited for greenhouse misting systems are piston pumps with medium flow rates (15–50 l/min) and a maximum pressure well above the working pressure, so as to ensure stability even after thousands of hours of operation. Hawk has developed an entire range dedicated to misting systems.

Within this range, the XLTI series is the benchmark for medium and large-sized greenhouse systems.

The XLTI series: the Hawk pump for greenhouses

The XLTI series offers a flow rate ranging from 15 to 54 liters per minute and a maximum pressure of 300 bar. For a greenhouse misting system, where the operating pressure typically settles at values between 40 and 80 bar, this means working with a very wide safety margin: the pump runs at a fraction of its rated capacity, with a clear advantage in terms of operating life and maintenance intervals.

The modularity of the series makes it possible to choose the model with the flow rate best suited to the number of nozzles to be supplied. Hawk also produces specific variants of the XLTI for particular situations: the XLTI Chemical for aggressive fluids and the XLTI Stainless Steel Chemical for applications with chemical products. These variants are useful when the misting system is also used for distributing nutrient solutions or treatment products.

Hawk pumps for greenhouse misting systems: comparison table

Complementary components for greenhouse misting systems

The pump is the heart of the system, but the end result also depends on the accessories that complete it. For greenhouse systems, Hawk also supplies specific misting nozzles (the TNC range, with or without filter, calibrated to produce uniform micro-droplets), high-pressure flexible hoses designed for professional systems, and regulating valves with bypass to keep flow rate and pressure stable even as the number of active nozzles varies. Coherence between pump, valves, and nozzles is what determines the quality of misting and the energy efficiency of the entire system.

Why choose Hawk for greenhouse misting pumps

Hawk pumps for greenhouse misting systems are produced in Reggio Emilia in a production cycle certified ISO 9001:2015, ISO 14001:2015, ISO 50001:2018, and ISO 45001:2018. The advantage of choosing Hawk for a greenhouse system lies in the ability to select the most suitable pump from a range developed specifically for misting, with maximum pressures optimized to reduce energy consumption and dedicated accessories engineered to work seamlessly with each series. For the correct selection of the model based on greenhouse volume, number of nozzles, and the conditions of the water available, Hawk's technical support works alongside the designer to define the most efficient configuration.

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