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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)
    $220.53 each
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    242
    Wed, Jun 23
    424
    QtyArrives
    242 Wed, Jun 23
    182 Thu, Jun 24
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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)
    $100.54 each
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    510
    Wed, Jun 23
    660
    QtyArrives
    510 Wed, Jun 23
    150 Thu, Jun 24
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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)
    $170.97 each
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    331
    Wed, Jun 23
    517
    QtyArrives
    331 Wed, Jun 23
    186 Thu, Jun 24
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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
    (59)
    $234.35 each
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    196
    Wed, Jun 23
    252
    QtyArrives
    196 Wed, Jun 23
    56 Thu, Jun 24
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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)
    $160.98 each
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    163
    Wed, Jun 23
    409
    QtyArrives
    163 Wed, Jun 23
    246 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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
    (16)
    $92.04 each
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    173
    Wed, Jun 23
    383
    QtyArrives
    173 Wed, Jun 23
    210 Thu, Jun 24
    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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    152
    Wed, Jun 23
    347
    QtyArrives
    152 Wed, Jun 23
    195 Thu, Jun 24
    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)
    $225.88 each
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    104
    Wed, Jun 23
    260
    QtyArrives
    104 Wed, Jun 23
    156 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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
    (5)
    $59.64 each
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    183
    Wed, Jun 23
    388
    QtyArrives
    183 Wed, Jun 23
    205 Thu, Jun 24
    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
    (19)
    $110.31 each
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    137
    Wed, Jun 23
    472
    QtyArrives
    137 Wed, Jun 23
    335 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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)
    $30.94 each
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    179
    Wed, Jun 23
    521
    QtyArrives
    179 Wed, Jun 23
    342 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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)
    $27.66 each
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    235
    Wed, Jun 23
    679
    QtyArrives
    235 Wed, Jun 23
    444 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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)
    $166.63 each
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    46
    Wed, Jun 23
    258
    QtyArrives
    46 Wed, Jun 23
    212 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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)
    $107.63 each
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    90
    Wed, Jun 23
    263
    QtyArrives
    90 Wed, Jun 23
    173 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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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    284
    Wed, Jun 23
    284
    QtyArrives
    284 Wed, Jun 23
    Questions? Call 1-888-757-4774
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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)
    $31.52 each
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    215
    Wed, Jun 23
    249
    QtyArrives
    215 Wed, Jun 23
    34 Mon, Jun 28 – Tue, Jun 29
    Questions? Call 1-888-757-4774
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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)
    $120.53 each
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    83
    Wed, Jun 23
    97
    QtyArrives
    83 Wed, Jun 23
    14 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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)
    $111.50 each
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    83
    Wed, Jun 23
    256
    QtyArrives
    83 Wed, Jun 23
    173 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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)
    $10.09 each
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    Thu, Jul 8 – Thu, Jul 15
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    Thu, Jul 8 – Thu, Jul 15
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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)
    $226.25 each
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    50
    Wed, Jun 23
    212
    QtyArrives
    50 Wed, Jun 23
    162 Thu, Jun 24
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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)
    $106.93 each
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    38
    Wed, Jun 23
    50
    QtyArrives
    38 Wed, Jun 23
    12 Thu, Jun 24
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  • Circulator Aquastat<br>5°F to 30°F Adj. Differential 100°F to 240°F Range Product Image
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    Circulator 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 Range
    SKU: L4006B1163 Resideo
    SKU: L4006B1163
    Brand: Resideo
    (8)
    $95.62 each
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    136
    Wed, Jun 23
    169
    QtyArrives
    136 Wed, Jun 23
    33 Thu, Jun 24
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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)
    $232.84 each
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    40
    Wed, Jun 23
    94
    QtyArrives
    40 Wed, Jun 23
    54 Thu, Jun 24
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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)
    $110.00 each
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    51
    Wed, Jun 23
    226
    QtyArrives
    51 Wed, Jun 23
    175 Thu, Jun 24
    Questions? Call 1-888-757-4774
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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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