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Internet # 203205172

Model # 45-400

Low Water Cut Off 24-Volt Gas Steam

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  • Test button examines burner circuit for proper control operation
  • 30-second lock-out function if water level remains below probe
  • Manual reset function prevents tripping in case of power failure
  • View More Details
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Return this item within 90 days of purchase. Read Return Policy
Product Details

About This Product

Interrupts power immediately in a low water condition. Burner circuit locks-out if water remains below probe for 30 seconds. Manual reset will not trip due to power failures.


  • Test button checks burner circuit to ensure proper control operation
  • Lock-out function without lowering the water level
  • Can also be used as a secondary cut-off on steam boilers
  • Meets ASME CSD-1 requirements for commercial water boilers
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 203205172

Model # 45-400


Dimensions: H 5.625 in, W 5.5 in, D 6.25 in


Product Depth (in.)

6.25 in

Product Height (in.)

5.625 in

Product Width (in.)

5.5 in


Accessory Type


Product Weight (lb.)

2 lb



Warranty / Certifications

Manufacturer Warranty


Questions & Answers

Q:What series is this?
by|Mar 12, 2023
1 Answer
Answer This Question

A:  The model indicated is 45-400. If you scroll down the Home Depot product listing page you will come to a section entitled Product Details where you will find PDF’s of the product documents. If you open up the instructions they indicate that this model in part of the 400 series.

by|Mar 14, 2023
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      Installed with ease and definitely surpassed my expectations as my...
      Installed with ease and definitely surpassed my expectations as my heater unit is an older version. Thank you!
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