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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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Rated 5 out of 5 by Honeywell L641A Cylinder Stat Used to replace older Honeywell Stat, Easy to replace just fit ex cables to new stat, fit the new strap in place and switch on. Works well. 3 Sep 2015
Rated 3 out of 5 by 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
Rated 5 out of 5 by 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
Rated 4 out of 5 by 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
  • 2015-11-30 T09:38:54.746-06:00
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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