An aquastat is a device used in hydronic heating systems to control water temperatures. To prevent boilers from shooting too often, aquastats have high temperature limits and low limits. If the thermostat requires heat, the boiler will ignite until the upper limit is reached, then switch off (though the thermostat still requires heat). The boiler will come back on again if the boiler water temperature falls below the range around the high limit. The high limit exists for the sake of efficiency and security. The boiler will also light up (regardless of the thermostat state) when the boiler water temperature is below the range around the lower boundary, ensuring that the boiler water temperature remains above a certain point. The low limit is meant for domestic hot water without a tank --- ensuring that boiler water is always warm enough to heat domestic hot water. Many aquastats also have a differential control ("diff") that determines size ranges around "low" and/or "high" controls.
Aquastat is a registered trademark of Honeywell International Inc.
Video Aquastat
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Source of the article : Wikipedia
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