Aquastats & Wells

Honeywell Aquastats are among the world's most popular aquastats. We offer competitive pricing and our huge inventory of Honeywell Aquastats and Honeywell Aquastat Wells ensures that most models are in stock and ready to ship within 24-48 hours. If there is a model that you are looking for but can't find, give us a call or send us an e-mail and we'll find it for you.

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  • High or Low Limit & Circulator Strap-On Aquastat, 65-200°F range, 5-30°F Adj Differential View Specs

    $74.95 / each

    $218.85 / box
    3 x $72.95

    In Stock! (347 Available) Ships in 24-48 Hrs
  • High Limit Vertical Mount Aquastat Relay, 15°F differential View Specs

    $167.95 / each

    $485.85 / box
    3 x $161.95

    In Stock! (359 Available) Ships in 24-48 Hrs
  • High Limit Horizontal Mount Aquastat Relay, 8°F differential View Specs

    $131.85 / each

    $509.00 / box
    4 x $127.25

    In Stock! (221 Available) Ships in 24-48 Hrs
  • 3/4" Aquastat Well View Specs
    • SKU: 121371B
    • Brand: Honeywell

    $24.95 / each

    $95.80 / box
    4 x $23.95

    In Stock! (162 Available) Ships in 24-48 Hrs
  • Aquastat Relay, 8°F differential View Specs
    • SKU: L8148J1009
    • Brand: Honeywell

    $145.95 / each

    $555.80 / box
    4 x $138.95

    In Stock! (155 Available) Ships in 24-48 Hrs
  • 1/2" Aquastat Well View Specs
    • SKU: 121371A
    • Brand: Honeywell

    $22.35 / each

    $86.20 / box
    4 x $21.55

    In Stock! (257 Available) Ships in 24-48 Hrs
  • High or Low Limit & Circulator, Horizontal Mount Aquastat, 100-240°F range, 5-30°F Adj Differential View Specs

    $78.75 / each

    $301.80 / box
    4 x $75.45

    In Stock! (181 Available) Ships in 24-48 Hrs
  • High or Low Limit Aquastat, 100-240°F range, 5-30°F Adj Differential View Specs

    $73.75 / each

    $284.60 / box
    4 x $71.15

    In Stock! (65 Available) Ships in 24-48 Hrs
  • 120 Vac Oil Electronic Aquastat View Specs
    • SKU: L7224U1002
    • Brand: Honeywell

    $129.95 / each

    $376.35 / box
    3 x $125.45

    In Stock! (417 Available) Ships in 24-48 Hrs
  • High Limit Strap-On Aquastat, 100-240°F range, Manual Reset View Specs

    $115.95 / each

    $335.85 / box
    3 x $111.95

    In Stock! (81 Available) Ships in 24-48 Hrs
  • High or Low Limit Remote Bulb Aquastat, 100-240°F, 5-30°F Adj Differential View Specs

    $96.95 / each

    $367.80 / box
    4 x $91.95

    In Stock! (65 Available) Ships in 24-48 Hrs
  • High or Low Limit Aquastat, 40°F to 180°F Range View Specs
    • SKU: L4006A1959
    • Brand: Honeywell

    $80.85 / each

    $315.80 / box
    4 x $78.95

    In Stock! (44 Available) Ships in 24-48 Hrs
  • High Limit Protection, Low Limit & Circulator Triple Aquastat Relay, High = 10°F, Low Limit = 10-25° Adj Differential View Specs

    $179.95 / each

    $515.85 / box
    3 x $171.95

    In Stock! (53 Available) Ships in 24-48 Hrs
  • High or Low Limit Aquastat, 100-240°F range, 5-30°F Adj Differential View Specs

    $83.95 / each

    $327.80 / box
    4 x $81.95

    In Stock! (152 Available) Ships in 24-48 Hrs
  • High Limit Vertical Mount Aquastat Relay, 15°F differential View Specs

    $164.95 / each

    $479.85 / box
    3 x $159.95

    In Stock! (64 Available) Ships in 24-48 Hrs
  • High Limit Aquastat, 130-270°F range, Manual Reset View Specs

    $112.95 / each

    $427.80 / box
    4 x $106.95

    In Stock! (48 Available) Ships in 24-48 Hrs
  • Circulator Aquastat, 100-240°F range, 5-30°F Adj Differential View Specs

    $74.95 / each

    $218.85 / box
    3 x $72.95

    In Stock! (44 Available) Ships in 24-48 Hrs
  • Temperature Aquastat for "00" Series Circulators (95°F  - 115°F ) View Specs

    $26.85 / each

    $155.70 / box
    6 x $25.95

    In Stock! (25 Available) Ships in 24-48 Hrs
  • High or Low Limit Aquastat, 100-240°F range, 5°F to 30°F Differential View Specs

    $79.95 / each

    $311.80 / box
    4 x $77.95

    In Stock! (53 Available) Ships in 24-48 Hrs
  • Circulator Remote Bulb Aquastat, 100-240°F, 5-30°F Adj Differential View Specs

    $99.95 / each

    $383.80 / box
    4 x $95.95

    In Stock! (27 Available) Ships in 24-48 Hrs

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.