Flow Switches

Flow switches are an essential part of any home’s electrical system. They regulate the flow of electricity to appliances, lights, and more by turning on and off as needed. When something goes wrong with your flow switch—either it starts working intermittently or stops all together—you need a replacement fast.

Top Products

Best Overall

Why We Like

  • Max Switch Voltage: 250 VAC
  • Max Switching Current: 5 AMPS
  • Resistance with Leads: 30 OHM
  • Electrical Service Life: 200,000 Cycles
  • Mechanical Service Life: 10,000,000 Cycles

Minor Problems

  • It might be too heavy for some people.
Editor's Choice

Why We Like

  • Sensitivity adjusting screw
  • Flow adjustment easy
  • Four stainless steel paddles included: 1", 2", 3" & 6" (25, 50, 80, & 150mm)
  • Minimum/maximum temperature: 32 degrees F/300 degrees F
  • NPT

Minor Problems

  • It may not work.
Best Value

Why We Like

  • Low Cost
  • Leak Proof Body
  • Weatherproof

Minor Problems

  • It might not work if the pressure is too high or low.
1/14
General Pump 100975 Flow Switch, 12.0 GPM, 5000 psi

General Pump 100975 Flow Switch, 12.0 GPM, 5000 psi

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9.5
Based On 53 Reviews
  • Easy to use
    9.7
  • Value for money
    9.8
  • Customer support
    9
  • Overall satisfaction
    9.5

Pros

  • Max Switch Voltage: 250 VAC
  • Max Switching Current: 5 AMPS
  • Resistance with Leads: 30 OHM
  • Electrical Service Life: 200,000 Cycles
  • Mechanical Service Life: 10,000,000 Cycles

Cons

  • It might be too heavy for some people.
2/14
McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch
9.7
Based On 20 Reviews
  • Easy to use
    10
  • Value for money
    9.9
  • Customer support
    9
  • Overall satisfaction
    10

Pros

  • Sensitivity adjusting screw
  • Flow adjustment easy
  • Four stainless steel paddles included: 1", 2", 3" & 6" (25, 50, 80, & 150mm)
  • Minimum/maximum temperature: 32 degrees F/300 degrees F
  • NPT

Cons

  • It may not work.
3/14
Dwyer Flotect Series V10 Mini-Size Flow Switch, Brass Housing, Normally Open or Closed, Pressure Range 0-1000 psig, 1/2'' Male NPT
9.6
Based On 17 Reviews
  • Easy to use
    9.9
  • Value for money
    9.8
  • Customer support
    9
  • Overall satisfaction
    9.7

Pros

  • Low Cost
  • Leak Proof Body
  • Weatherproof

Cons

  • It might not work if the pressure is too high or low.
4/14
W.E. Anderson® Vane Flow Switch, FS-2, 1
8.2
Based On 16 Reviews
  • Easy to use
    8.2
  • Value for money
    9.4
  • Customer support
    7
  • Overall satisfaction
    8

Pros

  • Temperature Limits: 230°F (110°C)
  • Pressure Limits: 145 psig (10 bar)
  • SPDT snap switch
  • NEMA 4 (IP64) enclosure rating

Cons

  • It might not work well in all conditions.
5/14
Liquid Flow Switch, Flow Detector 3/4

Liquid Flow Switch, Flow Detector 3/4" MPT, Normally Open

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prime
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6.6
Based On 21 Reviews
  • Easy to use
    6.1
  • Value for money
    9.3
  • Customer support
    5
  • Overall satisfaction
    6

Pros

  • Economical
  • No-flow detector
  • 0.5 Amp switch
  • Rated 140 degree F
  • Grey PVC Construction

Cons

  • It can be clogged.
6/14
1/2
8.7
Based On 13 Reviews
  • Easy to use
    8.6
  • Value for money
    9.6
  • Customer support
    8
  • Overall satisfaction
    8.4

Pros

  • High quality
  • Temperature adaptability
  • Adjustable flow control value
  • Stable action repetition point
  • Measures liquid

Cons

  • It is difficult to control the water flow.
7/14
Gems Sensors FS-200 Series Bronze Flow Switch, Inline, Shuttle Type, 0.5 gpm Flow Setting, 1
7.5
Based On 7 Reviews
  • Easy to use
    7.4
  • Value for money
    9.4
  • Customer support
    6
  • Overall satisfaction
    7.2

Pros

  • 24" - 26" long leads
  • 18 AWG wire
  • SPDT switch type
  • 0.15 set point differential (maximum)
  • Fits many models

Cons

  • It may not be durable.
8/14
HFS-25 1
9.6
Based On 5 Reviews
  • Easy to use
    10
  • Value for money
    9.5
  • Customer support
    9
  • Overall satisfaction
    9.9

Pros

  • Quality stainless steel
  • Corrosion resistant
  • Service life long
  • Suitable for water treatment systems

Cons

  • It is a bit expensive.
9/14
Gems Sensors FS-927 Series Brass Compact Flow Switch, Elbow, Piston Type, Normally Open, 0.1 gpm Flow Setting, 1/4
9.8
Based On 3 Reviews
  • Easy to use
    10
  • Value for money
    10
  • Customer support
    9
  • Overall satisfaction
    10

Pros

  • 18 AWG brass and 316 Stainless Steel wire
  • SPST, N.O. switch type
  • Maximum set point differential of 0.2V
  • 50 micron filtration recommended

Cons

  • It might not work with your plumbing.
10/14
Gems Sensors - 122340 FS-4 Series Ryton Flow Switch, Elbow, Piston Type, SPST Switch, Normally Open, 0.1 gpm Flow Setting, 9/16
7.4
Based On 3 Reviews
  • Easy to use
    6.9
  • Value for money
    10
  • Customer support
    6
  • Overall satisfaction
    6.8

Pros

  • Wetted materials: Ryton, 316 Stainless Steel, Viton, Epoxy
  • Electrical termination: 18 AWG, Zipcord
  • Switch type: SPST, N.O. (20VA)
  • Set point differential (maximum): 0.2
  • Recommended filtration: 50 micron

Cons

  • It might not be durable.
11/14
Dwyer V6EPB-B-S-4-B Flotect Series V6 Mini-Size Flow Switch, Brass Upper and Lower Housing, SPDT Snap Switch, 1-1/4
9.8
Based On 1 Reviews
  • Easy to use
    10
  • Value for money
    10
  • Customer support
    9
  • Overall satisfaction
    10

Pros

  • Monitor flow
  • Explosion-proof
  • Leak proof lower body
  • Weatherproof
  • Electrical assembly can be easily replaced

Cons

  • It's a bit expensive.
12/14
SEN-DB32 DC 250V 1A 70W 100L/Min 11/4PT Adjustable Paddle Water Flow Switch Flowmeter
0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Built-in copper baffle
  • Simple structure
  • Can have one-way valve role
  • Level installation

Cons

  • It might be too small for some people's needs.
13/14
Mcdonnell & Miller Flow Switch, 1 in SPDT FS4-3

Mcdonnell & Miller Flow Switch, 1 in SPDT FS4-3

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0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Flow Switch, 1 In SPDT
  • For use with HVAC systems
  • Protects equipment from dirt and debris buildup

Cons

  • It might not work as expected.
14/14
Paddle Control Switch HFS25 1
0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Selected Stainless Steel Materials
  • Less likely to corrode and cause damage
  • Long service life

Cons

  • It may be clunky.

Authors

Michael Gordon
Michael Gordon— Author

Michael Gordon is a writer on our Website. He is experienced in Hydraulics, Pneumatics & Plumbing section.

James Palmer
James Palmer— Co-author

James Palmer is a writer on our Website. He is experienced in Industrial Electrical section.