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🔥 Take control of your hot water with precision and ease!
The Honeywell L641A1039 Cylinder Thermostat is a robust, surface-mount device designed for domestic hot water cylinders. Featuring a snap-action SPDT micro switch, tamperproof temperature settings, and a manual adjustment knob, it offers reliable, safe, and precise temperature control. Its double insulation ensures durability and safety, making it an easy, cost-effective replacement that saves time and money on installation.
| ASIN | B003DTIWGO |
| Backlight | No |
| Best Sellers Rank | 23,732 in DIY & Tools ( See Top 100 in DIY & Tools ) 15 in Thermostats 2,860 in Electrical |
| Brand | Honeywell |
| Brand Name | Honeywell |
| Colour | White |
| Connectivity Protocol | Wi-Fi |
| Connectivity Technology | Wired and Wi-Fi |
| Control Method | Touch |
| Control Type | Button Control |
| Controller Type | knob,manual |
| Controller type | knob,manual |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.6 out of 5 stars 764 Reviews |
| Display Type | manual |
| Finish Type | Mixed |
| Global Trade Identification Number | 05023220200093 |
| Included Components | Cylinder Stat |
| Item Type Name | Cylinder Stat |
| Manufacturer | Honeywell |
| Manufacturer Part Number | L641A1039 |
| Material Type | Plastic |
| Model Name | Cylinder Stat |
| Model Number | L641A1039 |
| Model name | Cylinder Stat |
| Mounting Type | Surface Mount |
| Number of Batteries | 2 AA batteries required. |
| Power Source | AC |
| Product Style | Modern |
| Smart Home Compatibility | Not Smart Home Compatible |
| Special Features | Manual Setting Knob, Tamperproof Temperature Setting |
| Special feature | Manual Setting Knob, Tamperproof Temperature Setting |
| Specific Uses For Product | Indoor use only |
| Specific uses for product | Indoor use only |
| Temperature Control Type | Manual |
| Unit Count | 1.0 count |
| Voltage | 230 Volts |
M**N
Great replacement and easy to install
Easy to install, works very well
R**D
Easy as 1-2-3 and cheaper here than local stores
Fitted in place of British Gas CS1 (which is the same as a Drayton RTS3) which was asking for hot water constantly and wouldn't switch off. Normally we only have the water programmed on for an hour a day but one day left it on by mistake and I noticed the water was insanely hot / the boiler was heating it constantly! The existing hole in my tank's insulation was wide enough although I did scrape a little extra clearance with the end of the screwdriver. I also used the existing wire band as this saved faffing around altering the one included here. After isolating the electrics, I opened up both 'stats, took a photo of the wiring in the old one and simply connected the wires to the same terminals in this unit. It was literally as easy as 1-2-3! If you can wire a plug, you can wire one of these up. The price here - approx £15 including delivery - was half the price of Screwfix / Toolstation and judging by the reviews this item is more reliable than my previous 'stat (although I suspect the old one was 10+ years old). All in all it's an easy fix. My wife tried to convince me to call a plumber. I saved a call-out, an 'hour's' labour (it took me 15 mins!) charge and no doubt a significant mark up on the item (which they may have paid £30 + for!) - so around £60 in total savings! I'll pocket the £60 to spend on more interesting things. Easy as 1-2-3.
A**R
Thermostat
Great value. Easily fitted to tank
M**G
Honeywell cylinder thermostat.
Easy to fit and nice and compact unit to replace old type thermostat. Works well and temperature dial easy to adjust.
A**R
Cylinder thermostat
Works
M**N
cylinder stat
all ok
K**R
Replacement for a very old one
Works well
J**.
Simple mechanism
I bought this to replace a suspect existing tank thermostat. The unit comprises of a bimetal strip mechanically connected to a microswitch with a normally on and normally off set of contacts. The unit is held to the hot water tank by a stretchy "curtain" wire which is a little tricky to attach as you need three hands. This unit is meant for contact to a copper cylinder as I assume attaching it to fibreglass or pre insulated type would not work properly.
Trustpilot
2 weeks ago
1 month ago