Wells / Immersion Wells / Thermowells

Wells and Thermowells protect temperature sensors in hydronic systems from harsh conditions while ensuring accurate readings. These protective tubes extend sensor life and allow safe maintenance without system shutdown. Jackson Systems stocks Wells in multiple lengths and thread sizes – find the exact fit for your hydronic application today.

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Showing 1–48 of 141 resultsSorted by popularity

Immersion Temperature Sensor, 5,000 Ohm NTC, 8″ Probe, 1/4″ NPT Adapter

True Manufacturing

SKU: 826974
$15.10
MSRP: $17.37
You save 15%
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Immersion Temperature Sensor, 100k Ohm Thermistor, 0–250°F, 6″ Probe

True Manufacturing

SKU: 213474
$88.39
MSRP: $101.65
You save 15%
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20/80°F SPST Temperature Control with Well & Capillary

Trane

SKU: CNT0428
$165.58
MSRP: $190.42
You save 15%
Trane CNT0428 20/80°F SPST Temperature Control with Well & Cap quantity
Water Temperature Sensor with 30ft Lead

Trane

SKU: SEN2941
$203.04
MSRP: $233.50
You save 15%
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6″ Thermistor Duct / Immersion Temperature Sensor

Trane

SKU: SEN1287
$168.28
MSRP: $193.52
You save 15%
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Water Temperature Sensor, 15/140°F Range, 5″ Probe

Trane

SKU: SEN0306
$392.90
MSRP: $451.84
You save 15%
Trane SEN0306 Water Temperature Sensor, 15/140°F Range, 5" Probe quantity
Temperature Probe Tube, OEM Trane Replacement Part

Trane

SKU: TUB2730
$39.66
MSRP: $45.61
You save 15%
Trane TUB2730 Temperature Probe Tube quantity
3/4″ Brass Immersion Well for 3.5″ BX Thermometers

Trerice

SKU: 3-4F2
$10.55
MSRP: $12.13
You save 15%
Trerice 3-4F2 3/4" Brass Immersion Well for 3.5" BX Thermometers quantity
Heat Transfer Paste, 1 oz

Trerice

SKU: 107-1
$8.16
MSRP: $9.38
You save 15%
Trerice 107-1 Heat Transfer Paste, 1 oz quantity
Thermistor Well for Temperature Sensing Applications

Trane

SKU: WEL0837
$770.10
MSRP: $885.62
You save 15%
Trane WEL0837 Thermistor Well for Temperature Sensing Applications quantity
Bulb Well Assembly for Temperature Sensing Applications

Trane

SKU: WEL0834
$340.43
MSRP: $391.49
You save 15%
Trane WEL0834 Bulb Well Assembly quantity
Temperature Sensor with Immersion Well for Boiler Systems

Laars Heating Systems

SKU: RE2347601
$107.20
MSRP: $123.28
You save 15%
Laars Heating Systems RE2347601 Temperature Sensor with Well quantity
56-T-1″ 60/140°F Remote Actuator Standard Bulb Thermostat

Sterling-Sterlco

SKU: T563-02-0000
$1,354.75
MSRP: $1,557.96
You save 15%
Sterling-Sterlco T563-02-0000 56-T-1" 60/140°F R/A Standard Bulb Thermostat quantity
Sensor Well for Accurate Temperature Sensing

Sporlan Controls

SKU: 952795
$213.69
MSRP: $245.74
You save 15%
Sporlan Controls 952795 Sensor Well quantity
AKS 12 PT1000 Temperature Sensor with 5.5M Cable

Spirax-Sarco

SKU: 55225
$75.85
MSRP: $87.23
You save 15%
Spirax-Sarco 55225 AKS 12 PT1000 Temperature Sensor with 5.5M Cable quantity
Sensor Well for Hydronic & Pool Heating Systems

Raypak

SKU: 006805F
$59.49
MSRP: $68.41
You save 15%
Raypak 006805F Sensor Well for Hydronic & Pool Heating Systems quantity
Temperature Sensor, 2.5″ Long Immersion Probe

Patterson-Kelley

SKU: 26-3000-0110
$80.90
MSRP: $93.04
You save 15%
Patterson-Kelley 26-3000-0110 Temperature Sensor, 2.5" Long quantity
Immersion Sensor Repair Kit, PT 1K OHM (375)

Siemens

SKU: 544-577-RK
$80.63
MSRP: $92.72
You save 15%
Siemens 544-577-RK Immersion Sensor Repair Kit PT 1K OHM (375) quantity
Immersion Temperature Sensor, Pt RTD, 1k Ohm, 6 in. Probe

Siemens

SKU: 544-577-60
$98.45
MSRP: $113.22
You save 15%
Siemens 544-577-60 Immersion Temperature Sensor, Pt RTD, 1k Ohm, 6 in. quantity
Immersion Temperature Sensor, Pt RTD, 1k Ohm, 4 In. Probe w/ Thermowell

Siemens

SKU: 544-577-40
$93.91
MSRP: $108.00
You save 15%
Siemens 544-577-40 Immersion Temperature Sensor, Pt RTD, 1k Ohm, 4 In. Probe quantity
Immersion Temp Sensor, Pt RTD, 1k Ohm, 0–250°F, 2.5″ Probe w/ Thermowell

Siemens

SKU: 544-577-25
$89.81
MSRP: $103.28
You save 15%
Siemens 544-577-25 Immersion Temperature Sensor, Pt RTD, 1k Ohm, 2.5" Probe quantity
Immersion Temperature Sensor, 4-20mA, 32–212°F, 2.5″ Probe

Siemens

SKU: 544-562-25
$123.78
MSRP: $142.35
You save 15%
Siemens Building Technology 544-562-25 Immersion Temperature Sensor, 4-20mA quantity
Immersion Temperature Sensor, 4-20mA, 30-250°F, 2.5″ Probe w/ Thermowell

Siemens

SKU: 536-767-25
$123.76
MSRP: $142.32
You save 15%
Siemens 536-767-25 Immersion Temperature Sensor, 4-20mA, 30-250°F, 2.5" Probe quantity
Aquastat Limit Control with 3/4″ Immersion Well

Peerless Boiler

SKU: 50535
$377.01
MSRP: $433.56
You save 15%
Peerless Boiler 50535 Aquastat Limit Control with 3/4" Immersion Well quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, NEMA 4

MAMAC

SKU: TE-703-D-7-A-1
$27.50
MSRP: $31.63
You save 15%
MAMAC Systems TE-703-D-7-A-1 Immersion Temperature Sensor, 10K NTC Thermistor quantity
Immersion Temperature Sensor, 4″ Probe, 20K NTC, NEMA 4 Enclosure

MAMAC

SKU: TE-703-D-17-A-1
$27.50
MSRP: $31.63
You save 15%
MAMAC Systems TE-703-D-17-A-1 Immersion Temperature Sensor, 4" Probe, NEMA 4 quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, NEMA 4

MAMAC

SKU: TE-703-D-12-A-3
$27.50
MSRP: $31.63
You save 15%
MAMAC Systems TE-703-D-12-A-3 Immersion Temperature Sensor, 10K NTC Thermistor, 4" Probe, NEMA 4 quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, NEMA 4

MAMAC

SKU: TE-703-D-12-A-2
$27.50
MSRP: $31.63
You save 15%
MAMAC Systems TE-703-D-12-A-2 Immersion Temperature Sensor, 10K NTC Thermistor, 4" Probe, NEMA 4 quantity
Immersion Temp Sensor, 10K NTC Type III, 4″ Probe, 1/2″ NPT, NEMA 1

MAMAC

SKU: TE-703-C-7-A-3
$15.10
MSRP: $17.37
You save 15%
MAMAC Systems TE-703-C-7-A-3 Immersion Temperature Sensor, 10K NTC Type III, 4" Probe, 1/2" NPT, NEMA 1 quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, 1/4″ NPT

MAMAC

SKU: TE-703-C-7-A-2
$15.10
MSRP: $17.37
You save 15%
MAMAC Systems TE-703-C-7-A-2 Immersion Temperature Sensor, 10K NTC Thermistor quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, NEMA 1

MAMAC

SKU: TE-703-C-7-A-1
$15.10
MSRP: $17.37
You save 15%
MAMAC Systems TE-703-C-7-A-1 Immersion Temperature Sensor, 10K NTC Thermistor, 4" Probe quantity
Immersion Temperature Sensor, 1,000 Ohm Pt RTD, 4″ Probe, 1/4″ NPT

MAMAC

SKU: TE-703-C-3-A-2
$16.98
MSRP: $19.53
You save 15%
MAMAC Systems TE-703-C-3-A-2 Immersion Temperature Sensor, 1,000 Ohm Pt RTD quantity
Immersion Temperature Sensor, 20K NTC Thermistor, 4″ Probe, 1/2″ NPT

MAMAC

SKU: TE-703-C-17-A-3
$15.10
MSRP: $17.37
You save 15%
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Immersion Temperature Sensor, 10K NTC Thermistor, 6″ Probe, NEMA 1

MAMAC

SKU: TE-703-C-12-B-2
$15.10
MSRP: $17.37
You save 15%
MAMAC Systems TE-703-C-12-B-2 Immersion Temperature Sensor, 10K NTC Thermistor quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, 1/2″ NPT

MAMAC

SKU: TE-703-C-12-A-3
$15.10
MSRP: $17.37
You save 15%
MAMAC Systems TE-703-C-12-A-3 Immersion Temperature Sensor, 10K NTC Thermistor quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, 1/4″ NPT

MAMAC

SKU: TE-703-C-12-A-2
$15.10
MSRP: $17.37
You save 15%
MAMAC Systems TE-703-C-12-A-2 Immersion Temperature Sensor, 10K NTC Thermistor quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, NEMA 1

MAMAC

SKU: TE-703-C-12-A-1
$15.10
MSRP: $17.37
You save 15%
MAMAC Systems TE-703-C-12-A-1 Immersion Temperature Sensor, 10K NTC Thermistor, 4" Probe, 1/8" NPT, NEMA 1 quantity
Immersion Temperature Sensor, 10K NTC Thermistor, 4″ Probe, 1/4″ NPT

MAMAC

SKU: TE-703-A-12-A-2
$12.94
MSRP: $14.88
You save 15%
MAMAC Systems TE-703-A-12-A-2 Immersion Temperature Sensor, 10K NTC Thermistor quantity
Well Thermostat/Outlet Sensor for Lochinvar & A.O. Smith

Lochinvar & A.O. Smith

SKU: 100233695
$41.35
MSRP: $47.55
You save 15%
Lochinvar & A.O. Smith 100233695 Well Thermostat/Outlet Sensor quantity
Bulbwell Replacement Part, SKU 100233613

Lochinvar & A.O. Smith

SKU: 100233613
$40.20
MSRP: $46.23
You save 15%
Lochinvar & A.O. Smith 100233613 Bulbwell quantity
Thermostat Well for Water Heater & Boiler Applications

Lochinvar & A.O. Smith

SKU: 100233496
$55.13
MSRP: $63.40
You save 15%
Lochinvar & A.O. Smith 100233496 Thermostat Well quantity
Bulbwell for Thermostat – OEM Replacement Part

Lochinvar & A.O. Smith

SKU: 100233264
$43.65
MSRP: $50.20
You save 15%
Lochinvar & A.O. Smith 100233264 Bulbwell for Thermostat quantity
1/4 in. Bulb Well for Lochinvar & A.O. Smith Equipment

Lochinvar & A.O. Smith

SKU: 100208569
$18.03
MSRP: $20.73
You save 15%
Lochinvar & A.O. Smith 100208569 1/4 in. Bulb Well quantity
1/4″ Immersion Sensor Stat for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100208563
$71.21
MSRP: $81.89
You save 15%
Lochinvar & A.O. Smith 100208563 1/4" Immersion Sensor Stat quantity
Dual Immersion Sensor, Outlet for Boiler Systems

Lochinvar & A.O. Smith

SKU: 100208559
$109.11
MSRP: $125.48
You save 15%
Lochinvar & A.O. Smith 100208559 Dual Immersion Sensor, Outlet quantity
Immersion Inlet Sensor for Lochinvar & A.O. Smith Units

Lochinvar & A.O. Smith

SKU: 100208553
$87.29
MSRP: $100.38
You save 15%
Lochinvar & A.O. Smith 100208553 Immersion Inlet Sensor quantity
Water Temperature Sensor with 11.75″ Lead Wire

Lochinvar & A.O. Smith

SKU: 100208552
$22.98
MSRP: $26.43
You save 15%
Lochinvar & A.O. Smith 100208552 Water Temperature Sensor, 11.75" Lead quantity
Immersion Outlet Sensor for Lochinvar & A.O. Smith Units

Lochinvar & A.O. Smith

SKU: 100208548
$87.29
MSRP: $100.38
You save 15%
Lochinvar & A.O. Smith 100208548 Immersion Outlet Sensor quantity