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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
  • View more information

Switch/contact rating: 4A resistive. 2A inductive. SPDT. Temperature range: 40°-80°C. H x W x D: 85 x 45 x 55mm.

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Honeywell L641A Cylinder Stat Instruction Manual



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Honeywell L641A Cylinder Stat 4.2 5 5 5
Good but not perfect This is the 3rd one of these I have had to buy in 8 years. It is used on a hot water tank to control the Worcester boiler. I have tried others but they are not ratted to 16A like this one, but every few years the micro switch packs up and we get no hot water. Plus side is they are very easy to fit and come with a new strap each time, although I re-use the old strap. 4 Jul 2015
Good Good Product nice Price Im Happy :D Easy Fitting Item no straight Talking Instructions no confusing layouts just place screw and attach Simple :D 22 Nov 2014
Worked as expected This was used to replace a similar but earlier model Honeywell cylinder stat. This was selected because the dimensions are the same as the earlier model meaning the cut-out in the cylinder insulation would be the correct size. This unit is supplied with a curtain wire type strap but it has a hole to allow it to be used with a steel band type strap. I used the steel band strap from the old installation, which worked fine. The terminals are easily accessible and an improvement on the previous model. The cable clamp is easy to access. 3 Aug 2013
Honeywell L641A Cylinder Stat. My old Stat that I was using has been on my cylinder since 1966,and worked fine for all this time,but it had just started to play up. I decided to read some reviews on Stats. The Honeywell L641A had very good reviews so I bought one. I had it fitted and it has been working correctly and I am extremely happy with my choice. 10 Mar 2013
  • 2015-08-27T15:28:04.253-05:00
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Brand Honeywell
Insulation Type Double Insulation
Manufacturing Standards Building Regs Compliant, Conforms to 89/336/EEC and 73/23/EEC
Model No L641A
Mount Type Surface-Mounted
Pack Size 1
Product Depth 55 mm
Product Height 85 mm
Product Type Cylinder Stat
Product Width 45 mm
Sensor Type Bi-Metallic Sensor
Suitable System Suitable for Uninsulated / Foam-Lagged Cylinders
Temperature Range 40 to 80 °C
Total Product Weight 0.20 kg