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  • High Limit Vertical Mount Aquastat Relay<br>15°F Differential Product Image
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    High Limit Vertical Mount Aquastat Relay 15°F Differential L8148E1265 High Limit Vertical Mount Aquastat Relay 15°F Differential
    SKU: L8148E1265 Resideo
    SKU: L8148E1265
    Brand: Resideo
    (94)
    $228.99 each
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    895
    Tue, Oct 5
    895
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    895 Tue, Oct 5
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  • High or Low Limit & Circulator Strap-On Aquastat, 65°F to 200°F Product Image
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    High 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°F
    SKU: L6006C1018 Resideo
    SKU: L6006C1018
    Brand: Resideo
    (39)
    $102.59 each
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    647
    Tue, Oct 5
    647
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    647 Tue, Oct 5
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  • High Limit Horiz. Mount Aquastat Relay<br>8°F Differential Product Image
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    High Limit Horiz. Mount Aquastat Relay 8°F Differential L8148A1017 High Limit Horiz. Mount Aquastat Relay 8°F Differential
    SKU: L8148A1017 Resideo
    SKU: L8148A1017
    Brand: Resideo
    (83)
    $169.69 each
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    684
    Tue, Oct 5
    684
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    684 Tue, Oct 5
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  • 140-240F AquaStat Relay w/ Vent Damper Connection Product Image
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    140-240F AquaStat Relay w/ Vent Damper Connection L8148E1257 140-240F AquaStat Relay w/ Vent Damper Connection
    SKU: L8148E1257 Resideo
    SKU: L8148E1257
    Brand: Resideo
    (60)
    $243.99 each
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    250
    Tue, Oct 5
    250
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    250 Tue, Oct 5
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  • 120 Vac Oil<br>Electronic Aquastat Product Image
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    120 Vac Oil Electronic Aquastat L7224U1002 120 Vac Oil Electronic Aquastat
    SKU: L7224U1002 Resideo
    SKU: L7224U1002
    Brand: Resideo
    (40)
    $160.99 each
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    444
    Tue, Oct 5
    444
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    444 Tue, Oct 5
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  • High or Low Limit Aquastat 100-240°F Range<br>5-30°F Adj Differential Product Image
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    High 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 Differential
    SKU: L4006A2007 Resideo
    SKU: L4006A2007
    Brand: Resideo
    (17)
    $97.99 each
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    484
    Tue, Oct 5
    484
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    484 Tue, Oct 5
    Questions? Call 1-888-757-4774
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  • Aquastat Relay<br>8°F Differential Product Image
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    Aquastat Relay 8°F Differential L8148J1009 Aquastat Relay 8°F Differential
    SKU: L8148J1009 Resideo
    SKU: L8148J1009
    Brand: Resideo
    (57)
    $221.23 each
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    451
    Tue, Oct 5
    451
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    451 Tue, Oct 5
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  • High Limit Immersion Aquastat, 100-200&deg;F Range, 8&deg;F Differential Product Image
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    High Limit Immersion Aquastat, 100-200°F Range, 8°F Differential L4080B1352 High Limit Immersion Aquastat, 100-200°F Range, 8°F Differential
    SKU: L4080B1352 Resideo
    SKU: L4080B1352
    Brand: Resideo
    (6)
    $61.99 each
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    369
    Tue, Oct 5
    369
    QtyArrives
    369 Tue, Oct 5
    Questions? Call 1-888-757-4774
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  • High Limit Protection<br>Low Limit & Circulator Triple Aquastat Relay Product Image
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    High Limit Protection Low Limit & Circulator Triple Aquastat Relay L8124A1007 High Limit Protection Low Limit & Circulator Triple Aquastat Relay
    SKU: L8124A1007 Resideo
    SKU: L8124A1007
    Brand: Resideo
    (21)
    $225.79 each
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    273
    Tue, Oct 5
    273
    QtyArrives
    273 Tue, Oct 5
    Questions? Call 1-888-757-4774
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  • High/Low Limit Circulator Horiz. Mount Aquastat<br>100-240°F Product Image
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    High/Low Limit Circulator Horiz. Mount Aquastat 100-240°F L6006A1145 High/Low Limit Circulator Horiz. Mount Aquastat 100-240°F
    SKU: L6006A1145 Resideo
    SKU: L6006A1145
    Brand: Resideo
    (20)
    $114.99 each
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    452
    Tue, Oct 5
    452
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    452 Tue, Oct 5
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  • 1/2" Aquastat Well Product Image
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    1/2" Aquastat Well 121371A 1/2" Aquastat Well
    SKU: 121371A Resideo
    SKU: 121371A
    Brand: Resideo
    (17)
    $28.79 each
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    583
    Tue, Oct 5
    583
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    583 Tue, Oct 5
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  • 3/4" Aquastat Well Product Image
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    3/4" Aquastat Well 121371B 3/4" Aquastat Well
    SKU: 121371B Resideo
    SKU: 121371B
    Brand: Resideo
    (17)
    $31.49 each
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    340
    Tue, Oct 5
    340
    QtyArrives
    340 Tue, Oct 5
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  • High Limit Strap-On Aquastat, Manual Reset 100°F to 240°F Product Image
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    High Limit Strap-On Aquastat, Manual Reset 100°F to 240°F L4006H1004 High Limit Strap-On Aquastat, Manual Reset 100°F to 240°F
    SKU: L4006H1004 Resideo
    SKU: L4006H1004
    Brand: Resideo
    (7)
    $172.99 each
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    406
    Tue, Oct 5
    406
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    406 Tue, Oct 5
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  • 3/4" Aquastat Well Product Image
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    3/4" Aquastat Well 121371B-OMI 3/4" Aquastat Well
    SKU: 121371B-OMI OMI
    SKU: 121371B-OMI
    Brand: OMI
    (1)
    $12.35 each
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    119
    Tue, Oct 5
    119
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    119 Tue, Oct 5
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  • High Limit, Manual Aquastat Controller<br>130°F to 270°F Product Image
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    High Limit, Manual Aquastat Controller 130°F to 270°F L4006E1000 High Limit, Manual Aquastat Controller 130°F to 270°F
    SKU: L4006E1000 Resideo
    SKU: L4006E1000
    Brand: Resideo
    (2)
    $111.99 each
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    370
    Tue, Oct 5
    370
    QtyArrives
    370 Tue, Oct 5
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  • High or Low Limit Remote Bulb Aquastat, 100-240°F<br>5-30°F Adj. Differential Product Image
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    High 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. Differential
    SKU: L4008A1015 Resideo
    SKU: L4008A1015
    Brand: Resideo
    (12)
    $124.99 each
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    135
    Tue, Oct 5
    135
    QtyArrives
    135 Tue, Oct 5
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  • Temperature Aquastat for "00" Series Circulators (95&#176;F to 115&#176;F) Product Image
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    Temperature Aquastat for "00" Series Circulators (95°F to 115°F) 563-2 Temperature Aquastat for "00" Series Circulators (95°F to 115°F)
    SKU: 563-2 Taco
    SKU: 563-2
    Brand: Taco
    (4)
    $32.47 each
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    176
    Tue, Oct 5
    292
    QtyArrives
    176 Tue, Oct 5
    116 Thu, Oct 7 – Fri, Oct 8
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  • High/Low Limit Aquastat<br>40&#176;F to 180&#176;F Range Product Image
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    High/Low Limit Aquastat 40°F to 180°F Range L4006A1959 High/Low Limit Aquastat 40°F to 180°F Range
    SKU: L4006A1959 Resideo
    SKU: L4006A1959
    Brand: Resideo
    (9)
    $115.99 each
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    243
    Tue, Oct 5
    243
    QtyArrives
    243 Tue, Oct 5
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  • 1/2" Aquastat Well Product Image
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    1/2" Aquastat Well 121371A-OMI 1/2" Aquastat Well
    SKU: 121371A-OMI OMI
    SKU: 121371A-OMI
    Brand: OMI
    (3)
    $11.82 each
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    203
    Tue, Oct 5
    203
    QtyArrives
    203 Tue, Oct 5
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  • High Limit Vertical Mount Aquastat Relay<br>15°F Differential Product Image
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    High Limit Vertical Mount Aquastat Relay 15°F Differential L8148E1299 High Limit Vertical Mount Aquastat Relay 15°F Differential
    SKU: L8148E1299 Resideo
    SKU: L8148E1299
    Brand: Resideo
    (17)
    $234.99 each
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    239
    Tue, Oct 5
    239
    QtyArrives
    239 Tue, Oct 5
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  • High Limit, Manual Reset Aquastat Controller<br>130&#176;F to 270&#176;F Product Image
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    High Limit, Manual Reset Aquastat Controller 130°F to 270°F L4008E1040 High Limit, Manual Reset Aquastat Controller 130°F to 270°F
    SKU: L4008E1040 Resideo
    SKU: L4008E1040
    Brand: Resideo
    (1)
    $110.99 each
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    34
    Tue, Oct 5
    34
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    34 Tue, Oct 5
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  • High Limit Horiz. Mount Triple Aquastat Relay Product Image
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    High Limit Horiz. Mount Triple Aquastat Relay L8124C1003 High Limit Horiz. Mount Triple Aquastat Relay
    SKU: L8124C1003 Resideo
    SKU: L8124C1003
    Brand: Resideo
    (16)
    $234.59 each
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    98
    Tue, Oct 5
    98
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    98 Tue, Oct 5
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  • High or Low Limit Aquastat 100-240°F Range<br>5-30°F Adj Differential Product Image
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    High 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 Differential
    SKU: L4006A1967 Resideo
    SKU: L4006A1967
    Brand: Resideo
    (7)
    $117.99 each
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    277
    Tue, Oct 5
    277
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    277 Tue, Oct 5
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  • 3/4" Long Aquastat Well Product Image
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    3/4" Long Aquastat Well 121371M 3/4" Long Aquastat Well
    SKU: 121371M Resideo
    SKU: 121371M
    Brand: Resideo
    (1)
    $41.49 each
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    244
    Tue, Oct 5
    244
    QtyArrives
    244 Tue, Oct 5
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FAQs, Manuals & Videos

Resources

Videos

Articles

  • 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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