What is an aquastat

It's no mystery that an aquastat is a control that goes with a boiler. If you don't know much more about it than that, though, you have a lot of company. There seems to be confusion about exactly what an aquastat does, what is an aquastat, and especially about finding a replacement aquastat when one fails.

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What is an aquastat

An aquastat is a device used in hydronic heating systems for controlling water temperature. 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. This technology-related article is a stub. You can help Wikipedia by expanding it. Contents move to sidebar hide. Article Talk. Read Edit View history. Tools Tools.

In hydronic heating we use both - the aquastat to control boiler water temperature, and the thermostat to control room temperature.

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An aquastat relay is a combination of three controls. As its name suggests, it's an aquastat, a relay and a transformer. All three components are mounted together in what looks like a gray painted brick, with a skinny copper cigar hanging out of the back on a very thin copper tube. The cigar is the temperature-sensing element of the aquastat. The purpose of the aquastat relay is to provide a place for most of the controls in a boiler system to be wired together. These are called terminal screws.

What is an aquastat

It's no mystery that an aquastat is a control that goes with a boiler. If you don't know much more about it than that, though, you have a lot of company. There seems to be confusion about exactly what an aquastat does, and especially about finding a replacement aquastat when one fails. An aquastat does the same thing as a thermostat.

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When the temperature rises to the setpoint, the switch opens breaks to turn off the burner SPST - The switching action of most aquastats is the same as an ordinary household light switch. Home Heating. Encyclopedia of building and construction terms. Hydronic systems, however, are only recently becoming popular among homeowners. You can turn one thing on or off. When you look inside the controller, you can see that there actually is one of each control. Heating, ventilation, and air conditioning. It's no mystery that an aquastat is a control that goes with a boiler. They're just on-and-off switches that control water temperature. Low limit - If the water temperature drops to this point, the aquastat will bring on the burner to heat the water, even if there's no call for heat from the room thermostat.

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Eventually, however, the water will begin to cool. Your Browser Is Incompatible You are seeing this message because we have detected you are using Internet Explorer 10 or older to browse our site. When the boiler shuts off after reaching the high limit, the system will continue to circulate water for as long as the thermostat is asking for heat. High limit, low limit and circulator control are all separate functions of single-function aquastats. There are two parts to the word - "aqua" and "stat. Twitter Link. It's often put in a metal sleeve called a well. In hydronic heating we use both - the aquastat to control boiler water temperature, and the thermostat to control room temperature. The bulb and capillary tube are filled with a temperature-sensitive substance called fill. This is the action of a high limit.