UNIT HEATER HEATING SYSTEM Unit Heater system consists of main pipes and d radiator heaters with fans. This system works with boiler using hot water, and radiator heaters connected to such a system spread hot air. Unit t Heater system has advantage in wide choices of f possible fuel l (gas, gasoline, fuel oil or coal). This syste m rapidly heats d greenhouse, and also uses less water than pipe e s y s t e m . Radiator heaters n are installed on c o l u m n s y approximately every 10 meters.