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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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High Limit Vertical Mount Aquastat Relay 15°F DifferentialSKU: L8148E1265Brand: Honeywell
(77)355Thu, Sep 5718Qty Arrives 355 Thu, Sep 5 71 Fri, Sep 6 292 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
High or Low Limit & Circulator Strap-On Aquastat, 65°F to 200°FSKU: L6006C1018Brand: Honeywell(35)503Thu, Sep 5 -
High Limit Horiz. Mount Aquastat Relay 8°F DifferentialSKU: L8148A1017Brand: Honeywell(69)227Thu, Sep 5461Qty Arrives 227 Thu, Sep 5 36 Fri, Sep 6 198 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![140-240F AquaStat Relay w/ Vent Damper Connection Product Image]()
140-240F AquaStat Relay w/ Vent Damper ConnectionSKU: L8148E1257Brand: Honeywell(32)223Thu, Sep 5291Qty Arrives 223 Thu, Sep 5 58 Fri, Sep 6 10 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![120 Vac Oil<br>Electronic Aquastat Product Image]()
120 Vac Oil Electronic AquastatSKU: L7224U1002Brand: Honeywell(35)284Thu, Sep 5643Qty Arrives 284 Thu, Sep 5 23 Fri, Sep 6 336 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![High or Low Limit Aquastat 100-240°F Range<br>5-30°F Adj Differential Product Image]()
High or Low Limit Aquastat 100-240°F Range 5-30°F Adj DifferentialSKU: L4006A2007Brand: Honeywell(12)327Thu, Sep 5525Qty Arrives 327 Thu, Sep 5 22 Fri, Sep 6 176 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![Aquastat Relay<br>8°F Differential Product Image]()
Aquastat Relay 8°F DifferentialSKU: L8148J1009Brand: Honeywell(45)146Thu, Sep 5417Qty Arrives 146 Thu, Sep 5 35 Fri, Sep 6 236 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![3/4" Aquastat Well Product Image]()
3/4" Aquastat WellSKU: 121371BBrand: Honeywell(10)188Thu, Sep 5489Qty Arrives 188 Thu, Sep 5 42 Fri, Sep 6 259 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![High Limit Immersion Aquastat, 100-200°F Range, 8°F Differential Product Image]()
High Limit Immersion Aquastat, 100-200°F Range, 8°F DifferentialSKU: L4080B1352Brand: Honeywell(2)78Thu, Sep 5296Qty Arrives 78 Thu, Sep 5 21 Fri, Sep 6 197 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![1/2" Aquastat Well Product Image]()
1/2" Aquastat WellSKU: 121371ABrand: Honeywell(10)147Thu, Sep 5628Qty Arrives 147 Thu, Sep 5 143 Fri, Sep 6 338 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![High/Low Limit Circulator Horiz. Mount Aquastat<br>100-240°F Product Image]()
High/Low Limit Circulator Horiz. Mount Aquastat 100-240°FSKU: L6006A1145Brand: Honeywell(14)134Thu, Sep 5533Qty Arrives 134 Thu, Sep 5 235 Fri, Sep 6 164 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![High Limit Strap-On Aquastat, Manual Reset 100°F to 240°F Product Image]()
High Limit Strap-On Aquastat, Manual Reset 100°F to 240°FSKU: L4006H1004Brand: Honeywell(6)92Thu, Sep 5284Qty Arrives 92 Thu, Sep 5 31 Fri, Sep 6 161 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![High or Low Limit Remote Bulb Aquastat, 100-240°F<br>5-30°F Adj. Differential Product Image]()
High or Low Limit Remote Bulb Aquastat, 100-240°F 5-30°F Adj. DifferentialSKU: L4008A1015Brand: Honeywell(10)107Thu, Sep 5 -
![High Limit, Manual Aquastat Controller<br>130°F to 270°F Product Image]()
High Limit, Manual Aquastat Controller 130°F to 270°FSKU: L4006E1000Brand: Honeywell(1)144Thu, Sep 5320Qty Arrives 144 Thu, Sep 5 26 Fri, Sep 6 150 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![High Limit Protection<br>Low Limit & Circulator Triple Aquastat Relay Product Image]()
High Limit Protection Low Limit & Circulator Triple Aquastat RelaySKU: L8124A1007Brand: Honeywell(13)81Thu, Sep 5 -
![High/Low Limit Aquastat<br>40°F to 180°F Range Product Image]()
High/Low Limit Aquastat 40°F to 180°F RangeSKU: L4006A1959Brand: Honeywell(9)113Thu, Sep 5 -
![3/4" Aquastat Well Product Image]()
3/4" Aquastat WellSKU: 121371B-OMIBrand: OMI -
![1/2" Aquastat Well Product Image]()
1/2" Aquastat WellSKU: 121371A-OMIBrand: OMI(2) -
![High Limit Aquastat<br>130°F to 270°F Range<br>Manual Reset Product Image]()
High Limit Aquastat 130°F to 270°F Range Manual ResetSKU: L4006E1067Brand: Honeywell(4)68Thu, Sep 5 -
![High or Low Limit Aquastat 100-240°F Range<br>5°F to 30°F Differential Product Image]()
High or Low Limit Aquastat 100-240°F Range 5°F to 30°F DifferentialSKU: L4006A1678Brand: Honeywell(4)58Thu, Sep 5 -
![High Limit Remote Bulb Aquastat, Manual Reset<br>130°F to 270°F Product Image]()
High Limit Remote Bulb Aquastat, Manual Reset 130°F to 270°FSKU: L4008E1156Brand: Honeywell(2)58Thu, Sep 5175Qty Arrives 58 Thu, Sep 5 71 Fri, Sep 6 46 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![Temperature Aquastat for "00" Series Circulators (95°F to 115°F) Product Image]()
Temperature Aquastat for "00" Series Circulators (95°F to 115°F)SKU: 563-2Brand: Taco(3)38Thu, Sep 5 -
![High Limit Vertical Mount Aquastat Relay<br>15°F Differential Product Image]()
High Limit Vertical Mount Aquastat Relay 15°F DifferentialSKU: L8148E1299Brand: Honeywell(13)50Thu, Sep 5 -
![High Limit Horiz. Mount Triple Aquastat Relay Product Image]()
High Limit Horiz. Mount Triple Aquastat RelaySKU: L8124C1003Brand: Honeywell(15)37Thu, Sep 5 -
![Well Immersion Control<br>100°F to 240°F Range<br>7°F to 45°F Differential Product Image]()
Well Immersion Control 100°F to 240°F Range 7°F to 45°F DifferentialSKU: 1131-102Brand: White Rodgers(7)18Thu, Sep 5 -
![High Limit, Manual Reset Aquastat Controller<br>130°F to 270°F Product Image]()
High Limit, Manual Reset Aquastat Controller 130°F to 270°FSKU: L4008E1040Brand: Honeywell(1)43Thu, Sep 5 -
![High Limit Remote Bulb Aquastat, Manual Reset 100° to 240°F Product Image]()
High Limit Remote Bulb Aquastat, Manual Reset 100° to 240°FSKU: L4008E1305Brand: Honeywell29Thu, Sep 572Qty Arrives 29 Thu, Sep 5 25 Fri, Sep 6 18 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774 -
![Circulator Aquastat<br>5°F to 30°F Adj. Differential 100°F to 240°F Range Product Image]()
Circulator Aquastat 5°F to 30°F Adj. Differential 100°F to 240°F RangeSKU: L4006B1163Brand: Honeywell(8)26Thu, Sep 5 -
![High or Low Limit Aquastat 100-240°F Range<br>5-30°F Adj Differential Product Image]()
High or Low Limit Aquastat 100-240°F Range 5-30°F Adj DifferentialSKU: L4006A1967Brand: Honeywell(5)75Thu, Sep 5 -
![3/4" Long Aquastat Well Product Image]()
3/4" Long Aquastat WellSKU: 121371MBrand: Honeywell(1)50Thu, Sep 5215Qty Arrives 50 Thu, Sep 5 17 Fri, Sep 6 148 Mon, Sep 9 – Tue, Sep 10 Questions? Call 1-888-757-4774
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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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