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: €15

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€36.95 Incl. 20% VAT

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Honeywell L641A Cylinder Stat is rated 4.3 out of 5 by 3.
Rated 4 out of 5 by from 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.
Date published: 2013-08-03
Rated 5 out of 5 by from 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.
Date published: 2013-03-10
Rated 4 out of 5 by from Tank thermostat Did what it said on the box. Easy to install but the plastic centre is easily broken
Date published: 2013-01-13
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