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🎯 Take command of your hot water system with precision and peace of mind!
The Honeywell L641A1039 Cylinder Thermostat is a compact, surface-mounted device designed for domestic hot water cylinders. Featuring a snap action SPDT micro switch, tamperproof temperature settings, and an optional manual knob, it offers precise, reliable control for heating pumps, boilers, and zone valves. Its double insulated construction and accessible wiring terminals make installation safe and straightforward, ideal for indoor use.
| ASIN | B003DTIWGO |
| Backlight | No |
| Best Sellers Rank | 190,057 in DIY & Tools ( See Top 100 in DIY & Tools ) 166 in Thermostats 18,499 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 |
| Customer Reviews | 4.6 out of 5 stars 769 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. |
| Number of Items | 1 |
| Power Source | AC |
| Product Style | Modern |
| 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
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.
J**H
Don't unscrew everything like I did!
Good product - would buy again. Important: when removing plastic outer casing in order to connect the mains wire - you only need to unscrew the single long corner screw and carefully remove the plastic rotary dial (just pulls off). The casing should tilt up and pull away freely exposing the mains wire connection area. Don't do what I did and unscrew any of the other screws because if feels 'stuck' -> if you do you will only completely mess up the temperature sensing element.
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
Cylinder thermostat
Works
"**"
Excellent customer support
This is an excellent product and the support is great, it arrived on time. Recommended
M**N
cylinder stat
all ok
A**R
Thermostat
Great value. Easily fitted to tank
Trustpilot
2 months ago
2 weeks ago