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Honeywell L641A Cylinder Stat Product Code: 40051

Bi-metallic sensor. Surface-mounted. Control for boilers and wet central heating. Conforms to 89/336/EEC and 73/23/EEC. EN 60730.


  • Suitable for Uninsulated & Foam-Lagged Cylinders
  • Fixing Strap Included
  • Double Insulated
  • 1 Year Guarantee
  • Suitable for Uninsulated & Foam-Lagged Cylinders
  • Fixing Strap Included
  • Double Insulated


Switch/contact rating: 4A resistive. 2A inductive. SPDT. Temperature range: 40°-80°C. H x W x D: 85 x 45 x 55mm.
Additional Information
Technical Specification
  • Brand : Honeywell
  • Product Height : 85 mm
  • Product Type : Cylinder Stat
  • Insulation Type : Double-Insulated
  • Central Heating Control Type : Thermostats
  • Model No : L641A
  • Product Width : 45 mm
  • Temperature Range : 40 to 80 °C
  • Product Depth : 55 mm
  • Pack Size : 1
  • Suitable System : Suitable for Uninsulated / Foam-Lagged Cylinders
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
  • Mount Type : Surface-Mounted
  • Sensor Type : Bi-Metallic Sensor
Product Contents
Delivery & Returns


Standard delivery service up to 3 working days: €8.95

Free delivery on all orders over €70.00

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Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


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€38.45 Incl. 23% VAT

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Honeywell L641A Cylinder Stat is rated 4.6 out of 5 by 19.
Rated 5 out of 5 by from Simple to fit Quick and simple to fit, just make sure that the elasticated cable length is correct before you screw in the hooks on the end, because once on you can't get them off! Good quality kit and Honeywell is a good brand.
Date published: 2019-07-01
Rated 5 out of 5 by from Direct replacement Was sorting some boiler controls out and found this stat to be faulty/ broken. At a late hour in the evening, managed to pick it up and secure the part. Straight swap. Price at the time didnt bother me. Honeywell is a good make, and didn't think I needed to reinvent the wheel.
Date published: 2018-12-07
Rated 5 out of 5 by from Honeywell Cylinder Stat Bought to replace existing stat when tank was replaced. Simple to fix. All instructions clear and concise. Looks very neat and working well.
Date published: 2018-02-09
Rated 5 out of 5 by from Simple, reliable and robust. Damaged the previous 10 year old thermostat by mistake. This is a direct replacement, simple to fit straight out of the box.
Date published: 2017-01-15
Rated 5 out of 5 by from Perfect replacement Bought this product to replace an older faulty one. Simple to install the new unit to the existing wiring (3 wires) and now all working as it should do!
Date published: 2016-12-14
Rated 5 out of 5 by from Seems v good Replaced a twenty-year old Potterton t.stat. Quick and easy. three wires to connect. Needed no earth. Looks robust plastic and metal.. Well-designed terminals and cable clamp. I checked the set temp with an IR thermometer and it was controlling to within a degree or so of the set temp.
Date published: 2016-09-22
Rated 4 out of 5 by from Honeywell Cylinder Stat. I have always used Honeywell stuff for central heating system controls and the cylinder stat is an easy wire, easy fit unit that I know will give good reliable service to my customer which is all you want for a business life free from call- backs.
Date published: 2016-09-09
Rated 5 out of 5 by from Quality item This is a like for like replacement purchase. I fitted the original one thirty years ago need I say more!
Date published: 2016-06-27
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