The modern horticulture greenhouse is heated by a central hot water system, whether or not in combination with hot-air convectors. Depending on the type of cultivation, various pipe systems are fitted in the greenhouse, for example the so-called pipe rail system, the monorail heating and the facade heating.
The choice of the source of heat is determined by the availability of different energy sources. In most situations the choice will be natural gas, but oil, propane gas, thermal springs and biomass are also used.
An additional advantage of natural gas is that the CO2 that is released with combustion, can be used in the greenhouse again to promote the growth of the crop. If no natural gas is used, it is possible to dose the required CO2 through an evaporator.
Apart from the frequently used combination of hot-water boilers with heat storage buffers, alternative or additional heating sources can be applied in the form of cogenerations (WKK), heat pumps or district heating.
The final choice will be determined on the basis of the consumption requirements of the greenhouse, whereby the required investment in relation to the efficiency to be supplied is taken into account.