---
product_id: 48082193
title: "Honeywell Cyl Stat L641A1039"
brand: "honeywell"
price: "Bs.1089"
currency: BOB
in_stock: true
reviews_count: 8
category: "Honeywell"
url: https://www.desertcart.bo/products/48082193-honeywell-cyl-stat-l641a1039
store_origin: BO
region: Bolivia
---

# 230V AC power for reliable operation Tamperproof temperature setting for safety Snap Action SPDT switch for precise control Honeywell Cyl Stat L641A1039

**Brand:** honeywell
**Price:** Bs.1089
**Availability:** ✅ In Stock

## Summary

> 🔥 Take control of your hot water—smart, simple, and secure!

## Quick Answers

- **What is this?** Honeywell Cyl Stat L641A1039 by honeywell
- **How much does it cost?** Bs.1089 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/48082193-honeywell-cyl-stat-l641a1039)

## 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

- • **Secure & Safe:** Tamperproof temperature setting protects your settings from accidental changes, keeping comfort consistent.
- • **Custom Comfort:** Optional manual setting knob lets you fine-tune water temperature exactly how you like it.
- • **Compact & Durable:** Modern, double insulated plastic housing fits neatly on your cylinder and guarantees long-lasting reliability.
- • **Precision Control:** Snap Action SPDT micro switch ensures accurate switching for your heating system’s optimal performance.
- • **Effortless Installation:** Surface mount design with easily accessible wiring terminals makes setup a breeze—no plumber needed!

## Overview

The Honeywell L641A1039 Cylinder Thermostat is a compact, surface-mounted device designed for domestic hot water cylinders. Featuring a reliable Snap Action SPDT micro switch and tamperproof temperature settings, it offers precise control over your heating system. Easy to install with accessible wiring terminals and an optional manual knob, this double insulated thermostat ensures safe, efficient operation and long-term durability.

## 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. Box Contains 1 x L641A1039 Stat

Review: Honeywell cylinder thermostat. - Easy to fit and nice and compact unit to replace old type thermostat. Works well and temperature dial easy to adjust.
Review: 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.

## 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 |
| Batteries | 2 AA batteries required. |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 26,254 in DIY & Tools ( See Top 100 in DIY & Tools ) 47 in Thermostats 3,184 in Electrical |
| Colour | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (744) |
| Date First Available | 24 Mar. 2010 |
| Display style | manual |
| Finish | Mixed |
| Included Components | Cylinder Stat |
| Item Package Quantity | 1 |
| Item Weight | 240 g |
| Item model number | L641A1039 |
| Manufacturer | Honeywell |
| Material | Plastic |
| Part Number | L641A1039 |
| Plug profile | Surface Mount |
| Power Source | AC |
| Product Dimensions | 8.5 x 8.5 x 8.5 cm; 240 g |
| Special Features | Manual Setting Knob, Tamperproof Temperature Setting |
| Style | Modern |
| Switch Type | 1-way |
| Switch style | SPDT |
| Usage | Indoor use only |
| Voltage | 230 Volts |

## Product Details

- **Brand:** Honeywell
- **Colour:** White
- **Connectivity technology:** Wired and Wi-Fi
- **Controller type:** knob,manual
- **Included components:** Cylinder Stat
- **Model name:** Cylinder Stat
- **Power source:** AC
- **Special feature:** Manual Setting Knob, Tamperproof Temperature Setting
- **Specific uses for product:** Indoor use only
- **Temperature Control Type:** Manual

## Images

![Honeywell Cyl Stat L641A1039 - Image 1](https://m.media-amazon.com/images/I/41dGxUI2SKL.jpg)
![Honeywell Cyl Stat L641A1039 - Image 2](https://m.media-amazon.com/images/I/51LnYkZr-VL.jpg)

## Questions & Answers

**Q: I need a thermostat to show the tempereture of the hot water tank. It will consist of sensor wire 3 meters and an indicator to see the tempereture in**
A: These units do not have a gauge attached. They are strapped on with an 'elasticated wire  and make contact with the cylinder by cutting a suitable hole in the insulation. I'd think that there may well be a suitable gauge out there somewhere. I could do with one myself actually so I'll have a look on 'google' By the way I'd go for one that does not need to be powered and works on contact.

**Q: why are there no screws to undo to hold the cable?**
A: The unit comes with a flexible tie (same as that used for net curtains) that goes around the cylinder. This tie has hooks and the thermostat has eyes. Thus the hook and eye system keep the unit tight to the cylinder. Make are that the thermostat has metal to metal contact so that it can register the temperature of the hot water.

**Q: Why does this say 2x AA batteries required, this should be mains?**
A: 100% no batteries required it is hard wired into your heating / hot water junction box.

**Q: I have  potterton ptt2 water cylinder thermostat with sensor which is obsolete now . would this honeywell l641a1039 be ok as a replacement**
A: The Potterton PTT2 is not a conventional Cylinder Thermostat as it’s wired externally to the Tank with it’s own temp sensor. Sadly as you mentioned it’s now obsolete. The only option (if you can’t find another PTT2) is to replace it with a terminal box with heat resistant flex outlet to the new stat. Up to 3 wires from the original PTT2 will need to go to the new stat, new stat instructions will confirm it.

Finally the live wires will then be redundant and will require to be either terminated or spurred to a new useful output (plug socket box, a lamp etc) 

Please ensure a qualified electrician does ANY electrical work or changes in your home heating setup.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Honeywell cylinder thermostat.
*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.

### ⭐⭐⭐⭐⭐ Easy as 1-2-3 and cheaper here than local stores
*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.

### ⭐⭐⭐⭐ Thermostat
*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

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-01-27*