Honeywell Home L641A Cylinder Stat (40051)

£ 29.74INC VAT

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Honeywell Home L641A Cylinder Stat (40051)

Bi-metallic sensor. Surface-mounted. Control for boilers and wet central heating.

  • Suitable for Uninsulated & Foam-Lagged Cylinders
  • Surface-Mounted
  • Bi-Metallic Sensor
  • 1 Year Guarantee
  • Fixing Strap Included
  • Double-Insulated

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View all: Honeywell Home Cylinder Thermostats

£29.74INC VAT

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Honeywell Home L641A Cylinder Stat is rated 4.6 out of 5 by 25.
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Rated 5 out of 5 by from very accurate Bought this to replace a relatively new Danfoss thermostat, as the sensitivity of the Danfoss was very poor, so would not switch on until water very cool, or off until water was very hot. Honeywell thermostat is far more accurate!
Date published: 2021-05-11
Rated 5 out of 5 by from Great thermostat Efficient cylinder thermostat that’s easy to install, adjust, and read.
Date published: 2021-05-06
Rated 5 out of 5 by from Quality product at good price Bought to replace Honeywell L641A1005 original to house. Straight forward like for like swap. Product was up to usual Honeywell high standards with a robust feel about it. I don't doubt that this unit will give many years of trouble free service which makes it's price well worth it in my opinion.
Date published: 2021-01-16
Rated 5 out of 5 by from L641A1005 ideal replacement Bought this as a replacement for my original Honeywell L641A1005. Inside the terminals are in the same order so nice an easy swap over.
Date published: 2021-01-03
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Can this cylinder stat be connected to the pump on the hot water side of my central heating to turn the pump on and off as the temperature in the cylinder rises and falls

Asked by: aberdeen1

At what temperature should I set the thermostat for reasonably hot water ?

Asked by: Bigmeds
The standard industry temperature is 60 degrees and we would recommend not setting a temperature that is too low for the standard to avoid Legionella bacteria growing in stored water vessels. We would also recommend not setting a temperature that is too high to avoid scalding.
Answered by: Honeywell Home Consumer Support
Date published: 2020-10-26

Does this act as a high limit stat as well as a thermostat?

Asked by: DANNY1234567
The L641 is a surface contact thermostat designed to sense the water temperature in storage cylinders and water pipes, and to provide temperature control, temperature limiting, and temperature feedback functions.
Answered by: Honeywell Home Consumer Support
Date published: 2019-09-09

Does this use the same base plate as the old L641A1005 ? The base plate for the original is glued to the tank.

Asked by: Jafacake
The L641A1039, as with the L641A1005, does not have a detachable base plate. The unit is a one piece design with a removable cover. The product is a strap on unit, not glued to the cylinder.
Answered by: Honeywell Home Consumer Support
Date published: 2021-01-29

Can this be used for underfloor heating to switch on the pump when heating goes over the set temperature on the pipe?

Asked by: PawelM
The L641A is designed to control hot water temperature in a cylinder. Whilst it could do the job there is a range of pipe thermostats that would be better suited. The L6190B2030 being the most likely solution.
Answered by: Honeywell Home Consumer Support
Date published: 2017-09-30
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Specification
Brand Honeywell Home
Central Heating Control Type Thermostats
Insulation Type Double-Insulated
Manufacturer Guarantee 1 Year Guarantee
Model Name/No L641A
Model No L641A
Mount Type Surface-Mounted
Pack Size 1
Pieces in Pack/Case 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
Switching Capacity Resistive: 4A, Inductive: 2 A
Switch Type SPDT
Temperature Range 40 to 80 °C

Downloads

Instruction Manual