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Aquastats & Wells
Lead Content Warning
Do not use this item for any installation or repair of potable water applications. This product does not comply with the "Safe Drinking Water Act," which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking). This item is for non-potable (non-human consumption) water applications only.
Lead Content Warning
This product does not comply with the Safe Drinking Water Act, which requires that products used in any system providing water for human consumption (drinking or cooking) to meet low-lead standards. Please check the box below to confirm you are aware that this item is for non-potable water applications only.
You must agree to this statement in order to purchase this product.
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Add to ListAdd to ListHigh Limit Vertical Mount Aquastat Relay 15°F Differential L8148E1265 High Limit Vertical Mount Aquastat Relay 15°F DifferentialSKU: L8148E1265Brand: Honeywell
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Add to ListAdd to ListHigh or Low Limit & Circulator Strap-On Aquastat, 65°F to 200°F L6006C1018 High or Low Limit & Circulator Strap-On Aquastat, 65°F to 200°FSKU: L6006C1018Brand: Honeywell(35)Add to List -
Add to ListAdd to ListHigh Limit Horiz. Mount Aquastat Relay 8°F Differential L8148A1017 High Limit Horiz. Mount Aquastat Relay 8°F DifferentialSKU: L8148A1017Brand: Honeywell(74)Add to List -
![140-240F AquaStat Relay w/ Vent Damper Connection Product Image]()
Add to ListAdd to List140-240F AquaStat Relay w/ Vent Damper Connection L8148E1257 140-240F AquaStat Relay w/ Vent Damper ConnectionSKU: L8148E1257Brand: Honeywell(40)Add to List -
![120 Vac Oil<br>Electronic Aquastat Product Image]()
Add to ListAdd to List120 Vac Oil Electronic Aquastat L7224U1002 120 Vac Oil Electronic AquastatSKU: L7224U1002Brand: Honeywell(37)Add to List -
![Aquastat Relay<br>8°F Differential Product Image]()
Add to ListAdd to ListAquastat Relay 8°F Differential L8148J1009 Aquastat Relay 8°F DifferentialSKU: L8148J1009Brand: Honeywell(48)Add to List -
![High or Low Limit Aquastat 100-240°F Range<br>5-30°F Adj Differential Product Image]()
Add to ListAdd to ListHigh or Low Limit Aquastat 100-240°F Range 5-30°F Adj Differential L4006A2007 High or Low Limit Aquastat 100-240°F Range 5-30°F Adj DifferentialSKU: L4006A2007Brand: Honeywell(12)Add to List -
![High Limit Immersion Aquastat, 100-200°F Range, 8°F Differential Product Image]()
Add to ListAdd to ListHigh Limit Immersion Aquastat, 100-200°F Range, 8°F Differential L4080B1352 High Limit Immersion Aquastat, 100-200°F Range, 8°F DifferentialSKU: L4080B1352Brand: Honeywell(4)Add to List -
![1/2" Aquastat Well Product Image]()
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![3/4" Aquastat Well Product Image]()
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![High/Low Limit Circulator Horiz. Mount Aquastat<br>100-240°F Product Image]()
Add to ListAdd to ListHigh/Low Limit Circulator Horiz. Mount Aquastat 100-240°F L6006A1145 High/Low Limit Circulator Horiz. Mount Aquastat 100-240°FSKU: L6006A1145Brand: Honeywell(16)Add to List -
![High Limit Strap-On Aquastat, Manual Reset 100°F to 240°F Product Image]()
Add to ListAdd to ListHigh Limit Strap-On Aquastat, Manual Reset 100°F to 240°F L4006H1004 High Limit Strap-On Aquastat, Manual Reset 100°F to 240°FSKU: L4006H1004Brand: Honeywell(6)Add to List -
![High Limit Protection<br>Low Limit & Circulator Triple Aquastat Relay Product Image]()
Add to ListAdd to ListHigh Limit Protection Low Limit & Circulator Triple Aquastat Relay L8124A1007 High Limit Protection Low Limit & Circulator Triple Aquastat RelaySKU: L8124A1007Brand: Honeywell(13)Add to List -
![High or Low Limit Remote Bulb Aquastat, 100-240°F<br>5-30°F Adj. Differential Product Image]()
Add to ListAdd to ListHigh or Low Limit Remote Bulb Aquastat, 100-240°F 5-30°F Adj. Differential L4008A1015 High or Low Limit Remote Bulb Aquastat, 100-240°F 5-30°F Adj. DifferentialSKU: L4008A1015Brand: Honeywell(10)Add to List -
![High Limit, Manual Aquastat Controller<br>130°F to 270°F Product Image]()
Add to ListAdd to ListHigh Limit, Manual Aquastat Controller 130°F to 270°F L4006E1000 High Limit, Manual Aquastat Controller 130°F to 270°FSKU: L4006E1000Brand: Honeywell(1)Add to List -
![High/Low Limit Aquastat<br>40°F to 180°F Range Product Image]()
Add to ListAdd to ListHigh/Low Limit Aquastat 40°F to 180°F Range L4006A1959 High/Low Limit Aquastat 40°F to 180°F RangeSKU: L4006A1959Brand: Honeywell(9)Add to List -
![Circulator Aquastat<br>5°F to 30°F Adj. Differential 100°F to 240°F Range Product Image]()
Add to ListAdd to ListCirculator Aquastat 5°F to 30°F Adj. Differential 100°F to 240°F Range L4006B1163 Circulator Aquastat 5°F to 30°F Adj. Differential 100°F to 240°F RangeSKU: L4006B1163Brand: Honeywell(8)Add to List -
![3/4" Aquastat Well Product Image]()
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![1/2" Aquastat Well Product Image]()
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![High Limit Aquastat<br>130°F to 270°F Range<br>Manual Reset Product Image]()
Add to ListAdd to ListHigh Limit Aquastat 130°F to 270°F Range Manual Reset L4006E1067 High Limit Aquastat 130°F to 270°F Range Manual ResetSKU: L4006E1067Brand: Honeywell(4)Add to List -
![High or Low Limit Aquastat 100-240°F Range<br>5°F to 30°F Differential Product Image]()
Add to ListAdd to ListHigh or Low Limit Aquastat 100-240°F Range 5°F to 30°F Differential L4006A1678 High or Low Limit Aquastat 100-240°F Range 5°F to 30°F DifferentialSKU: L4006A1678Brand: Honeywell(4)Add to List -
![Temperature Aquastat for "00" Series Circulators (95°F to 115°F) Product Image]()
Add to ListAdd to ListTemperature Aquastat for "00" Series Circulators (95°F to 115°F) 563-2 Temperature Aquastat for "00" Series Circulators (95°F to 115°F)SKU: 563-2Brand: Taco(3)30Wed, Jan 29Add to List -
![High Limit, Manual Reset Aquastat Controller<br>130°F to 270°F Product Image]()
Add to ListAdd to ListHigh Limit, Manual Reset Aquastat Controller 130°F to 270°F L4008E1040 High Limit, Manual Reset Aquastat Controller 130°F to 270°FSKU: L4008E1040Brand: Honeywell(1)Add to List -
![High Limit Horiz. Mount Triple Aquastat Relay Product Image]()
Add to ListAdd to ListHigh Limit Horiz. Mount Triple Aquastat Relay L8124C1003 High Limit Horiz. Mount Triple Aquastat RelaySKU: L8124C1003Brand: Honeywell(15)Add to List -
![High Limit Vertical Mount Aquastat Relay<br>15°F Differential Product Image]()
Add to ListAdd to ListHigh Limit Vertical Mount Aquastat Relay 15°F Differential L8148E1299 High Limit Vertical Mount Aquastat Relay 15°F DifferentialSKU: L8148E1299Brand: Honeywell(13)Add to List -
![High Limit Remote Bulb Aquastat, Manual Reset<br>130°F to 270°F Product Image]()
Add to ListAdd to ListHigh Limit Remote Bulb Aquastat, Manual Reset 130°F to 270°F L4008E1156 High Limit Remote Bulb Aquastat, Manual Reset 130°F to 270°FSKU: L4008E1156Brand: Honeywell(2)Add to List -
![Well Immersion Control<br>100°F to 240°F Range<br>7°F to 45°F Differential Product Image]()
Add to ListAdd to ListWell Immersion Control 100°F to 240°F Range 7°F to 45°F Differential 1131-102 Well Immersion Control 100°F to 240°F Range 7°F to 45°F DifferentialSKU: 1131-102Brand: White Rodgers(7)Add to List -
![High or Low Limit Aquastat 100-240°F Range<br>5-30°F Adj Differential Product Image]()
Add to ListAdd to ListHigh or Low Limit Aquastat 100-240°F Range 5-30°F Adj Differential L4006A1967 High or Low Limit Aquastat 100-240°F Range 5-30°F Adj DifferentialSKU: L4006A1967Brand: Honeywell(5)Add to List -
![3/4" Long Aquastat Well Product Image]()
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![High Limit Remote Bulb Aquastat, Manual Reset 100° to 240°F Product Image]()
Add to ListAdd to ListHigh Limit Remote Bulb Aquastat, Manual Reset 100° to 240°F L4008E1305 High Limit Remote Bulb Aquastat, Manual Reset 100° to 240°FSKU: L4008E1305Brand: HoneywellAdd to List
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More About Aquastats & Wells
An aquastat is a device used to control water temperature in hydronic heating systems. It has both high and low limit temperature controls to prevent boilers from firing too frequently. Aquastats are a type of thermostat that senses the temperature of the water and activates or deactivates the burner by controlling the electrical circuit. The temperature of the water is maintained by the aquastat within its preset limits. When the thermostat demands heat, the heating mechanism activates and heat will be sent until the maximum temperature limit is reached. At that point, the mechanism will turn off. If the boiler's water temperature drops below the max temperature limit, the boiler will re-fire. The boiler will also re-fire when the boiler water temperature goes below a range around the low limit. This low limit is intended for tankless domestic hot water, ensuring that boiler water remains warm enough to heat domestic hot water.
Aquastat wells are used in conjunction with aquastats. Immersion wells are used with Aquastat Temperature Controllers to hold the temperature sensing bulb in the controlled medium. They also prevent leakage of the controlled medium. Honeywell aquastat wells are popular and are available in 1/2" and 3/4" sizes.
Our website offers a wide selection of Honeywell, White Rodgers, and Taco aquastats and wells for regulating the temperature of liquids in boilers, storage tanks, and other applications where temperature control is required.
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