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 97–144 of 160 resultsSorted by popularity

General Purpose Test Well for Refrigeration Systems

Heatcraft Refrigeration

SKU: 2257514
$144.95
MSRP: $166.69
You save 15%
Read more
High Limit Temp Control, Auto Recycle, 140-240°F, 30°F Differential

Weil McLain

SKU: 510-312-250
$178.64
MSRP: $205.44
You save 15%
Weil McLain 510-312-250 High Limit Temp Control Auto Recycle 140-240°F w/ 1/2" NPT Well quantity
High Limit Temp Control SPST Auto Recycle 140-240F w/ 3/4″ NPT Well

Weil McLain

SKU: 510-312-209
$214.39
MSRP: $246.55
You save 15%
Weil McLain 510-312-209 High Limit Temp Control SPST Auto Recycle 140-240F quantity
Tankless Heater Low Limit, 8° Differential With Well

Weil McLain

SKU: 510-312-152
$219.66
MSRP: $252.61
You save 15%
Weil McLain 510-312-152 Tankless Heater Low Limit, 8° Differential With Well quantity
Universal 3-In-1 Outdoor, Indoor Strap-On, or Well Sensor

Weil McLain

SKU: 389-900-229
$237.61
MSRP: $273.25
You save 15%
Weil McLain 389-900-229 Universal 3-In-1 Outdoor/Indoor/Well Sensor quantity
WM97+ CWH Top Temperature Sensor Well

Weil McLain

SKU: 383-700-213
$71.58
MSRP: $82.32
You save 15%
Weil McLain 383-700-213 WM97+ CWH Top Temperature Sensor Well quantity
Water Supply Piping Assembly with Check Valve & Compression Fitting

Weil McLain

SKU: 383-501-036
$549.15
MSRP: $631.52
You save 15%
Weil McLain 383-501-036 Water Supply Piping Assembly with Check Valve quantity
Water Supply Piping Assembly with Check Valve & Temperature Well

Weil McLain

SKU: 383-500-380
$312.60
MSRP: $359.49
You save 15%
Weil McLain 383-500-380 Water Supply Piping Assembly with Check Valve & Temp Well quantity
1/2 NPT Thermowell for Temperature Gauge, Series 1-3

Weil McLain

SKU: 383-500-270
$37.49
MSRP: $43.11
You save 15%
Weil McLain 383-500-270 1/2 NPT Thermowell for Temperature Gauge S1-3 quantity
Water Supply Piping Assembly with Check Valve & Compression Fitting

Weil McLain

SKU: 383-500-265
$776.08
MSRP: $892.49
You save 15%
Weil McLain 383-500-265 Water Supply Piping Assembly with Check Valve quantity
60″ 316 Stainless Steel Probe Rod for Boiler Level Control

McDonnell & Miller

SKU: G-5-SS
$80.73
MSRP: $92.84
You save 15%
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Thermo Well for Accurate Temperature Sensing

York

SKU: 026-32328-000
$216.60
MSRP: $249.09
You save 15%
York 026-32328-000 Thermo Well quantity
Leaving Water Temperature Sensor, OEM Replacement

York

SKU: 025-40273-001
$185.04
MSRP: $212.80
You save 15%
York 025-40273-001 Leaving Water Temperature Sensor quantity
Entering Water Sensor for Daikin-McQuay Systems

Daikin-McQuay

SKU: 349982404
$97.14
MSRP: $111.71
You save 15%
Daikin-McQuay 349982404 Entering Water Sensor quantity
1/2″ NPT 2-1/2″ Insertion 304 Stainless Steel Thermowell

Carrier

SKU: 4662
$53.80
MSRP: $61.87
You save 13%
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3/4″ NPT Brass Immersion Well / Thermowell

Beckett

SKU: 7622TW04U
$42.35
MSRP: $48.70
You save 15%
Beckett 7622TW04U 3/4" NPT Brass Immersion Well Thermowell quantity
Sensor Well for Carrier Commercial HVAC Systems

Carrier

SKU: 30RA500358
$51.45
MSRP: $59.17
You save 15%
Carrier 30RA500358 Sensor Well quantity
4″ Sensor Well for Hydronic & HVAC Systems

Carrier

SKU: 10HB50106802
$50.56
MSRP: $58.14
You save 15%
Carrier 10HB50106802 4" Sensor Well quantity
3″ Sensor Well for Carrier HVAC Systems

Carrier

SKU: 10HB50106801
$60.40
MSRP: $69.46
You save 15%
Carrier 10HB50106801 3" Sensor Well quantity
Brass Immersion Well for Temperature Sensing Applications

Carrier

SKU: 00PPG000008000A
$253.69
MSRP: $291.74
You save 15%
Carrier 00PPG000008000A Brass Well quantity
Immersion Thermowell for Hydronic & HVAC Systems

Bosch HVAC

SKU: 7738006263
$47.20
MSRP: $54.28
You save 15%
Bosch 7738006263 WELL Immersion Thermowell quantity
Sensor Well with 3/4″ NPT Connection

Bosch HVAC

SKU: 5446190
$56.34
MSRP: $64.79
You save 15%
Bosch 5446190 Sensor Well with 3/4" NPT Connection quantity
Sensor Well R3/4″ x 100mm Thermowell for HVAC Systems

Bosch HVAC

SKU: 5446065
$83.23
MSRP: $95.71
You save 15%
Bosch 5446065 Sensor Well R3/4" x 100mm Thermowell quantity
SPST Immersion Aquastat, 180–240°F Temperature Range

Burnham Boiler

SKU: 80160474
$141.20
MSRP: $162.38
You save 15%
Burnham Boiler 80160474 SPST Immersion Aquastat, 180–240°F quantity
10K Immersion Temperature Sensor with 4″ Probe

BAPI

SKU: BA/10K-2-I-4-BB2
$21.99
MSRP: $25.29
You save 13%
BAPI BA/10K-2-I-4-BB2 10K Immersion Temperature Sensor with 4" Probe quantity
10K Immersion Temperature Sensor with 4″ Probe

BAPI

SKU: BA/10K-2-I-4
$20.99
MSRP: $24.14
You save 13%
BAPI BA/10K-2-I-4 10K Immersion Temperature Sensor with 4" Probe quantity
10K Immersion Temperature Sensor with 2″ Probe

BAPI

SKU: BA/10K-2-I-2-BB2
$22.35
MSRP: $25.70
You save 15%
BAPI BA/10K-2-I-2-BB2 10K Immersion Temperature Sensor, 2" Probe quantity
10K Immersion Temperature Sensor with 2″ Probe

BAPI

SKU: BA/10K-2-I-2
$22.99
MSRP: $26.44
You save 13%
BAPI BA/10K-2-I-2 10K Immersion Temperature Sensor with 2" Probe quantity
T-Piece with Thermowell, 1-1/2″ Pipe Size

Belimo

SKU: A-22PE-A13
$63.77
MSRP: $73.34
You save 15%
Belimo A-22PE-A13 T-Piece with Thermowell 1-1/2" quantity
Stainless Steel Thermowell, 6″ Insertion Length, 1/2″ NPT

Belimo

SKU: A-22P-A09
$25.07
MSRP: $28.83
You save 13%
Belimo A-22P-A09 Stainless Steel Thermowell 6" Insertion 1/2" NPT quantity
Thermowell Stainless Steel 1/2″ NPT 100MM

Belimo

SKU: A-22P-A07
$21.11
MSRP: $24.28
You save 15%
Belimo A-22P-A07 Thermowell Stainless Steel 1/2" NPT 100MM quantity
Passive NTC10k3 Temperature Sensor, 8″ Immersion

Belimo

SKU: 01DT-5MP
$21.37
MSRP: $24.58
You save 13%
Belimo 01DT-5MP Passive NTC10k3 Temperature Sensor 8" Immersion quantity
Passive NTC10k Temperature Sensor, 4″ Immersion

Belimo

SKU: 01DT-5LL
$21.90
MSRP: $25.19
You save 13%
Belimo 01DT-5LL Passive NTC10k Temperature Sensor 4" Immersion quantity
Temperature Sensor, 4″ Immersion

Schneider Electric

SKU: ETI800-4
$24.53
MSRP: $28.21
You save 15%
Schneider Electric (Barber Colman) ETI800-4 Temperature Sensor, 4" Immersion quantity
Temperature Sensor, 4″ Immersion, 10K Ohm

Schneider Electric

SKU: ETI500-4
$22.50
MSRP: $25.88
You save 13%
Schneider Electric (Barber Colman) ETI500-4 Temperature Sensor, 4" Immersion, 10K Ohm quantity
Immersion Temperature Sensor with 2.5″ Probe

Auburn

SKU: E5-I-10-25
$67.66
MSRP: $77.81
You save 13%
Auburn E5-I-10-25 Immersion Temperature Sensor 2.5" Probe quantity
18″ Solid SS Liquid Level Electrode Probe, 1/4″ Dia, 1/4-20 Thread

Auburn

SKU: E5-1420-18
$27.75
MSRP: $31.91
You save 13%
Auburn E5-1420-18 18" Solid Stainless Steel Liquid Level Electrode Probe quantity
Immersion temp sensor with 4″ galvanized well & 1/2″ NPT threads

ACI

SKU: A/AN-I-4-GD
$49.48
MSRP: $56.90
You save 13%
ACI A/AN-I-4-GD Immersion Temperature Sensor, 4" Galvanized Well, 1/2" NPT quantity
10kOhm thermistor sensor with 4″ immersion well and enclosure

ACI

SKU: 123394
$51.51
MSRP: $59.24
You save 13%
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10kOhm thermistor with 2.5″ well mount and enclosure

ACI

SKU: 123389
$51.51
MSRP: $59.24
You save 13%
ACI 123389 10kOhm Thermistor Well Sensor 2.5" Enclosure quantity
10kOhm thermistor well-mount sensor with 2.5″ enclosure

ACI

SKU: 122063
$48.96
MSRP: $56.30
You save 13%
ACI 122063 10kOhm Thermistor Well Sensor with 2.5" Enclosure quantity
10kOhm thermistor well-mount temperature sensor, 4″ insertion

ACI

SKU: 121469
$63.99
MSRP: $73.59
You save 15%
ACI 121469 10kOhm Thermistor Well Sensor 4" with Enclosure quantity
20kOhm encapsulated thermistor well sensor with 4″ insertion depth

ACI

SKU: 119657
$48.96
MSRP: $56.30
You save 13%
ACI 119657 20kOhm Thermistor Well Sensor 4" Encapsulated quantity
1kOhm 2-wire well-mount temperature sensor with 4″ enclosure

ACI

SKU: 119541
$53.53
MSRP: $71.56
You save 25%
ACI 119541 1kOhm 2-Wire Well Temperature Sensor with 4" Enclosure quantity
Temperature Sensor Well, 1/2″ NPT, 1-13/16″ Shank Length

Copeland

SKU: F89-0211
$44.49
MSRP: $51.16
You save 15%
Copeland F89-0211 Temperature Sensor Well, 1/2" NPT, 1-13/16" Shank Length quantity
1/2″ NPT Immersion Well for Temperature Controls

Copeland

SKU: F89-0148
$42.42
MSRP: $48.78
You save 15%
Copeland F89-0148 1/2" NPT Immersion Well for Temperature Controls quantity
Immersion Well — 1/2″ NPT, 3-1/2″ x 7/16″ Bulb

Copeland

SKU: F89-0036
$45.58
MSRP: $52.42
You save 15%
Copeland Comfort Control F89-0036 Immersion Well — 1/2" NPT, 3-1/2" x 7/16" Bulb quantity
Immersion Well, 3/4″ NPT, 1-13/16″ Shank

Copeland

SKU: F89-0213
$47.75
MSRP: $54.91
You save 15%
Copeland White-Rodgers F89-0213 Immersion Well, 3/4" NPT, 1-13/16" Shank quantity