An aquastat is a device used in hydronic heating systems for controlling water temperature.[1][2] To prevent the boiler from firing too frequently, aquastats have a high limit temperature and a low limit. If the thermostat is calling for heat, the boiler will fire until the high limit is reached, then shut off (even if the thermostat is still calling for heat). The boiler will re-fire if the boiler water temperature drops below a range around the high limit. The high limit exists for the sake of efficiency and safety. The boiler will also fire (regardless of thermostat state) when the boiler water temperature goes below a range around the low limit, ensuring that the boiler water temperature remains above a certain point. The low limit is intended for tankless domestic hot water; it ensures that boiler water is always warm enough to heat the domestic hot water. Many aquastats also have a differential (diff) control which determines the size of the range around the low and/or high controls.
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Aquastat Breakdown: What You Need to Know
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Aquastat Descriptions for Heat and Hot Water
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References
- ^ Gupton, Guy w. (2002). HVAC Controls: Operation & Maintenance. Fairmont Press. p. 301. ISBN 9780881733419.
AQUASTAT—a thermostat used in water
- ^ Brooks, Hugh (1983). Encyclopedia of building and construction terms. Ann-Arbor MI USA: University of Michigan. p. 59. ISBN 9780132755115.
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This page was last edited on 8 February 2024, at 06:10