In the nursery industry, greenhouses provide a controlled environment for growing plants. However, in cooler climates greenhouses often require supplemental heating to grow more sensitive plants such as tropical houseplants, or to extend the growing season and increase profitability. Hydronic heating systems heat and deliver hot water to heat the greenhouse to the desired temperature.
These systems include a boiler, a hot water piping system and a controller. The boiler heats the water, which is then distributed to the growing areas of the greenhouse through a piping system.
A controller with a temperature sensor monitors the process and maintains desired temperatures. The primary benefit is that the grower can target the heat to its most useful location: the root zone of the plants. The hot water distribution system can be placed below the plants, either on or under a bench, or on or in the ground.
Applying heat to the plant roots means the grower is not directly heating the foliage or the air above the plants, as a forced-air heating system does. This leads to several other benefits, including less heat stratification (where all the hot air rises to the ceiling) and better plant growth (many plants prefer warm roots and cool leaves).
Another benefit is the ability to heat multiple zones in a greenhouse differently, according to crop rotation or varying plant needs.
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