Aquastat Temperature Control | Boiler ComponentsThe boiler aquastat controls the temperature of the water inside the boiler jacket. The boiler aquastat is a device to a boiler like a thermostat is to an air conditioner, heat pump, or gas/oil furnace. The boiler aquastat controls the temperature inside the boiler just as the thermostat controls the temperature for an air conditioner or heat pump. The boiler aquastat will turn the burners on and off and also controls the circulator pump on a hot water boiler system.
Aquastat Temperature Control | Boiler Components - How it WorksThe house thermostat on the wall that is connected to the boiler is connected to the boiler aquastat. When the thermostat calls for heat it sends a signal to the boiler aquastat to energize the circulator pump. The circulator pumps kicks on and pulls hot water through the hot water loop to provide the house or dwelling with heat. When the temperature inside the boiler jacket falls below the set point of the boiler aquastat the boiler aquastat engages the burners of the boiler and the boiler fires the burners to heat the water inside the boiler jacket.
Related Link - See our boiler sequence of operation article to learn more about aquastats.