--- product_id: 356697943 title: "Honeywell L641A1039 Cylinder Stat" brand: "honeywell" price: "S$3" currency: SGD in_stock: false reviews_count: 5 url: https://www.desertcart.sg/products/356697943-honeywell-l641a1039-cylinder-stat store_origin: SG region: Singapore --- # Snap Action SPDT Micro Switch Tamperproof Temperature Setting Easily Accessible Wiring Terminals Honeywell L641A1039 Cylinder Stat **Brand:** honeywell **Price:** S$3 **Availability:** ❌ Out of Stock ## Summary > 🔥 Take control of your comfort with Honeywell’s smart, secure thermostat! ## Quick Answers - **What is this?** Honeywell L641A1039 Cylinder Stat by honeywell - **How much does it cost?** S$3 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/356697943-honeywell-l641a1039-cylinder-stat) ## Best For - honeywell enthusiasts ## Why This Product - Trusted honeywell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Double insulated for enhanced durability and peace of mind in indoor environments. - • **Secure & Safe:** Tamperproof temperature setting keeps your system safe from accidental changes. - • **Effortless Installation:** Wiring terminals designed for quick, accessible setup—no electrician needed. - • **Versatile Compatibility:** Works seamlessly with wet central heating pumps, boilers, and zone valves. - • **Precision Control, Zero Hassle:** Snap Action SPDT switch ensures reliable, instant response for your heating system. ## Overview The Honeywell L641A1039 Cylinder Stat is a surface-mounted thermostat designed for domestic hot water cylinders. Featuring a snap action SPDT micro switch, tamperproof temperature settings, and easily accessible wiring terminals, it offers reliable, secure control for heating pumps, boilers, and zone valves. Its double insulation ensures durability, making it a trusted choice for indoor HVAC control. ## Description Product Description The L641A Cylinder Thermostat is designed for surface mounting on domestic hot water cylinders. It can be used to switch directly a wet central heating circulating pump or boiler, or to operate spring return and motor open/motor close zone valves. Set Contains: 1 x L641A1039 Stat Review: Easy to fit and nice and compact unit to replace old type thermostat. Works well and temperature dial easy to adjust. Review: 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. ## Features - Snap Action SPDT Micro Switch - Wiring Terminals Easily Accessible - Tamperproof Temperature Setting - Optional Manual Setting Knob Supplied - Double Insulated ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003DTIWGO | | ASIN | B003DTIWGO | | Backlight | No | | Batteries | 2 AA batteries required. | | Brand Name | Honeywell | | Color | White | | Connectivity Protocol | Wi-Fi | | Controller Type | knob,manual | | Customer Reviews | 4.6 4.6 out of 5 stars (723) | | Customer reviews | 4.6 4.6 out of 5 stars (723) | | Date First Available | 30 August 2012 | | Finish Types | Mixed | | Global Trade Identification Number | 05023220200093 | | Included Components | Cylinder Stat | | Is Discontinued By Manufacturer | No | | Item Type Name | Cylinder Stat | | Item model number | L641A1039 | | Manufacturer | Honeywell | | Manufacturer | Honeywell | | Material Type | Plastic | | Model Number | L641A1039 | | Mounting Type | Surface Mount | | Number of Batteries | 2 AA batteries required. | | Power Source | AC | | Product Dimensions | 8.5 x 8.5 x 8.5 cm; 240 g | | Specific Uses For Product | Indoor use only | | Unit Count | 1 Count | | Voltage | 230 Volts | ## Product Details - **Brand:** Honeywell - **Colour:** White - **Controller type:** knob,manual - **Included components:** Cylinder Stat - **Specific uses for product:** Indoor use only ## Images ![Honeywell L641A1039 Cylinder Stat - Image 1](https://m.media-amazon.com/images/I/51LnYkZr-VL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by M***G on 28 April 2025* Easy to fit and nice and compact unit to replace old type thermostat. Works well and temperature dial easy to adjust. ### ⭐⭐⭐⭐⭐ Review *by R***D on 10 November 2021* 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. ### ⭐⭐⭐⭐ Review *by A***R on 11 May 2024* Great value. Easily fitted to tank ## Frequently Bought Together - Honeywell L641A1039 Cylinder Stat, 230 V - HONEYWELL ST9400C Thermostat Programmer. 7, 2-Channel, 3 on/Off per Day, 24 V, White, 1 - Honeywell T6360B1028 Room Thermostat, 230/240V, White, 1 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/356697943-honeywell-l641a1039-cylinder-stat](https://www.desertcart.sg/products/356697943-honeywell-l641a1039-cylinder-stat) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-05-20*