---
product_id: 50178754
title: "Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm"
brand: "honeywell home"
price: "$921.30"
currency: USD
in_stock: false
reviews_count: 8
url: https://www.desertcart.us/products/50178754-honeywell-home-thr99c3110-evohome-smart-wi-fi-thermostat-kit-wireless
store_origin: US
region: United States of America
---

# 12-zone smart control 40% energy savings* Wireless boiler relay Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm

**Brand:** honeywell home
**Price:** $921.30
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Take control of your comfort — heat smarter, save bigger!

## Quick Answers

- **What is this?** Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm by honeywell home
- **How much does it cost?** $921.30 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/50178754-honeywell-home-thr99c3110-evohome-smart-wi-fi-thermostat-kit-wireless)

## Best For

- honeywell home enthusiasts

## Why This Product

- Trusted honeywell home brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart Savings Engine:** Cut heating costs by up to 40% with adaptive learning and optimization.
- • **Total Remote Command:** Manage your home heating anytime, anywhere via the intuitive TCC app.
- • **Precision Zoning Mastery:** Individually control up to 12 heating zones for tailored comfort.
- • **Future-Ready Compatibility:** Works flawlessly with Alexa, Google Home, and IFTTT for smart home synergy.
- • **Seamless Wireless Integration:** Effortless installation with wireless boiler relay—no renovations needed.

## Overview

The Honeywell evohome Smart Wi-Fi Thermostat Kit revolutionizes home heating with wireless, room-by-room temperature control across 12 zones. Featuring a vibrant full-color touchscreen and remote app access, it learns your home's heating patterns to optimize comfort and slash energy bills by up to 40%. Compatible with major smart home platforms, this easy-to-install system includes a wireless boiler relay module, making it the ultimate upgrade for modern, efficient living.

## Description

From the manufacturer evohome Smart Zoning controls your heating room-by-room giving you the right tem Comfort - You can easily control the temperature in any room or zone in your home, from the comfort of your armchair. More control - forget the old days when you had to get home to switch the heating on, with evohome you can do it from your smartphone. Save money - upgrading your basic timer and thermostat controls to evohome smart zoning could deliver as much as 40 percent savings on heating your home*. Smart Zoning - the ultimate way to heat your home evohome is a sophisticated heating system that allows you to create and individually control up to 12 heating zones in your home. In the same way you don’t have one light switch for your home, evohome allows room by room temperature control. The modular design means you can easily and quickly smart zone your entire home from day one or add zoning later on. As evohome is wireless, everything can be installed without any renovation. evohome learns how best to heat your home evohome learns exactly how long your property takes to heat up, activating exactly when it needs to for your heating to be at the perfect temperature - just at the right time. More importantly, evohome learns when to shut the boiler off. evohome thinks ahead too, if you tell it when you’re planning on sleeping or not in a room it will learn the optimal time to turn the heating off, meaning you can sleep at the perfect temperature knowing you aren't wasting money heating rooms that aren't in use. Modular design - build your evohome tailored to you Each evohome installation can be tailored to the needs of that specific home. Zones can be added over time and moved around if required. Users can start with the base station for remote access, then add zones as they become more familiar with the system. Or you can zone your entire home from day one. The choice is yours. Robust heating system that works in all homes Benefiting from the optimisation and learning features, evohome can be installed and is beneficial to anyone who is seeking greater comfort, control and energy savings from their home heating. Remote access - be in control, anytime, anywhere Control your heating system whenever you want, wherever you are. In the old days you had to get home to switch on your heating. The evohome mobile app makes that a thing of the past. Running late or coming home ahead of schedule? With evohome you can turn your heating on or off, up or down, from your smartphone app. Energy savings *Energy savings quoted were calculated using a 3 bedroom, 2 level home, located in the UK, modelling a family of 4 over a typical week’s activity, comparing an evohome smart zoning system, with recommended settings, to a system comprising a simple timer, single non-programmable room thermostat and no thermostatic radiator valves. Individual energy savings gained are dependent upon existing controls, environment and lifestyle.

Review: A very satisfying heating control device - After much research, I found this to be easily the best smart thermostat on the market and it goes the whole way by controlling individual radiators in addition to the central heating boiler. Every room has the right temperature at the right time. It's been about 3 months and we have not experienced any issues controlling this system remotely. Additionally, though all the controls on the thermostat are not available on the smartphone apps, this is not really detrimental. We bought 8 of the HR924UK radiator thermostats to go with this and the pairing went quite simply by following the instructions. I already had a very basic wireless thermostat which had been installed professionally, so I was able to connect the wireless module (this is separate from the thermostat but comes in the box) myself by following the wiring diagram at Honeywell's website for installers. Note that if you don't already have a wireless thermostat or you have the smallest doubt about connecting the wireless module, get a certified professional to avoid risk to life and property. Once everything is installed, you're on your way - you can name each thermostat around the house and decide what the temperature should be at different times of day in each room (the thermostat allows up to 10-minute precision). The thermostat touchscreen comes with a wizard to make this simple, or you can control the schedule with more control. The HR924 radiator thermostat regulates heat by opening and closing the valve as directed by the programmed schedule. There's a little noise as the motor turns, but after a while, you learn to tune it out. This combined system of the touchscreen thermostats and radiator controllers is very well thought out and includes options like always making a particular room a little warmer or cooler than the measured room temperature and showing which room(s) have caused the central heating boiler to come on. There could be some improvements (the battery life when the thermostat is moved from the base seems short and some features could be made more easy to access) but this has been one of my most satisfying purchases for a while.
Review: Excellent Investment in an Efficient System - It was an expensive investment to fit a large house with all the necessary radiator valves, but I am now consistently making savings of more than a third of my gas usage, measured over the first three months of 2022 compared with 2021. I'm writing this on 1 April 2022, a day when everyone's energy prices are rocketing, so I'm doubly pleased with this investment--I originally thought it would take years to repay the cost, but now it's going to be measured in months. Previously I had thermostatic radiator valves everywhere, but only one room thermostat, so edging up the temperature in the one main room for temporary extra comfort meant that heat was likely to be wasted everywhere else in the house--in effect there was only one control zone. With this system, almost every individual room is its own zone, and I can programme them for temperature and timing individually. Although we're using so much less energy, it's become very easy to focus where the heat goes and when. That means, for example, that the the living room can be heated quickly at a time when other zones are less important and programmed for lower temperatures, whilst the bedrooms can be left to their own devices for most of the day but warmed effectively overnight. The house feels more comfortable than before because the system is just so much more responsive. The central unit is easy to use, and the Total Comfort app supplements it by allowing more than one user to make adjustments--so when someone leaves their bedroom/home office for the evening after it's been heated all day, they can save energy by turning off the heat for that zone, maybe just for that evening. I did a totally DIY installation, but I would not necessarily recommend that for the faint-hearted or untrained buyer. Having researched other brands of smart thermostat systems and decided on Honeywell, I bought the kit and experimented with it as a dummy system, not actually controlling any radiators, nor connected to the boiler, until I understood how the programming works and could control a specimen valve at will. Then I gradually added the zone valves (in my case all my existing radiator valves were by Honeywell and the physical fitting was a breeze), and progressively changed the system wiring to use the new programmer instead of the old one (obviously that's the electrically challenging and potentially dangerous part). There was a fair bit of head-scratching along the way, but I'm really pleased with the result.

## Features

- Next-Generation Thermostat: The evohome is the brain of your home heating system. Create and individually control up to 12 heating zones. Remote access is easy via the Total Connect Comfort (TCC) app. Works with desertcart Alexa, Google Home and IFTTT
- Full-Colour Touchscreen Control: Users can quickly gain control of exactly where and when the property should be heated. Remote access via a tablet or smartphone keeps you in-the-know
- Inbuilt Optimisation: Intuitive and versatile programming allows the unit to more efficiently control your home's heating and cooling needs. Save money with precise and handy controls
- Easy Installation: evohome allows the installation of multiple temperature sensing devices around the property without altering existing pipework, disrupting decor or damaging fixtures and fittings. The thermostat can work with combi and system boilers
- Programming Modes: Delayed start and optimum stop allow evohome to intelligently optimise timing. A learning TPI algorithm ensures each zone adapts to the weather and the seasons. Day off mode changes the schedule for all the zones to a pre-set day
- Fully Control Your System: The evohome controller provides access for the installer to fully control the heating system, including the hot water heater. It is suitable for radiators, hydronic under floor and a mixture of both. Cycle rates, minimum on times and fail safe parameters can be set
- Includes Wireless Boiler Relay Box: The remote relay is wired into either a motorised zone valve or the boiler and provides the wireless interface between these devices and the evohome system

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01M63VB18 |
| Batteries | 2 AA batteries required. |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 279,636 in DIY & Tools ( See Top 100 in DIY & Tools ) 296 in Home Programmable Thermostats |
| Colour | White |
| Customer Reviews | 4.0 4.0 out of 5 stars (229) |
| Date First Available | 14 Oct. 2016 |
| Display style | Touch Screen |
| Finish | Glossy |
| Included Components | 1 x Wi-Fi thermostat, table stand and boiler module |
| Item Package Quantity | 1 |
| Item Weight | 240 g |
| Item model number | THR99C3110 |
| Manufacturer | Honeywell |
| Material | tpi |
| Measurement System | Metric |
| Number of Pieces | 2 |
| Part Number | THR99C3110 |
| Pattern | Single |
| Plug profile | Wall Mount |
| Power Source | Battery Powered |
| Product Dimensions | 13.5 x 2 x 11.7 cm; 240 g |
| Shape | Rectangular |
| Size | 139x101x21mm |
| Special Features | Next generation thermostat with zone control |
| Style | Thermostat + Relay |
| Usage | Heating systems, home heating, zone heating control, energy management |

## Product Details

- **Brand:** Honeywell Home
- **Colour:** White
- **Connectivity technology:** Wi-Fi
- **Controller type:** Android
- **Included components:** 1 x Wi-Fi thermostat, table stand and boiler module
- **Model name:** THR99C3110
- **Product dimensions:** 2.1D x 10.1W x 2.1H centimetres
- **Special feature:** Next generation thermostat with zone control
- **Specific uses for product:** Heating systems, home heating, zone heating control, energy management
- **Temperature Control Type:** digital

## Images

![Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm - Image 1](https://m.media-amazon.com/images/I/311FMDzZqDL.jpg)
![Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm - Image 2](https://m.media-amazon.com/images/I/31gBiFMHrzL.jpg)
![Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm - Image 3](https://m.media-amazon.com/images/I/31u30Y97Z3L.jpg)
![Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm - Image 4](https://m.media-amazon.com/images/I/417kZhnIt2L.jpg)
![Honeywell Home THR99C3110 evohome Smart Wi-Fi Thermostat Kit with Wireless Boiler Control Relay Module, White (2 Pack) 0V, 139x101x21mm - Image 5](https://m.media-amazon.com/images/I/41CVyE1iqWL.jpg)

## Questions & Answers

**Q: Are instructions provided for diy install? thanks**
A: There are instructions, although it’s wasn't very clear, how the “control box” connects to the boiler. That’s the little box with the one button on it. I had to watch a few YouTube videos to work it out and I am a electrician. Not impossible to do, but maybe a little past diy standard.

**Q: Is the evohome multi zone thermostat compatable with a Worcester Green Star 30i please?**
A: As I’m am not a heating engineer, I would double check with you ever you get to install the relays for the system. Although I would see no reason this system wouldn’t work with the Green Star boiler.
It is a control system that simply replaces your fitted timer control panel.
It might be worth checking with Honeywell.com their website is very good in case you are still unsure.
👍🏻

**Q: I have a honeywell home relay already,do i still need this specific one.?**
A: Yes. This provides the link between the relay and the wi-fi hub

**Q: Do i need yo replace my timer controller to use this?**
A: Yes, this goes in place of your existing timer

## Customer Reviews

### ⭐⭐⭐⭐⭐ A very satisfying heating control device
*by T***D on 27 January 2019*

After much research, I found this to be easily the best smart thermostat on the market and it goes the whole way by controlling individual radiators in addition to the central heating boiler. Every room has the right temperature at the right time. It's been about 3 months and we have not experienced any issues controlling this system remotely. Additionally, though all the controls on the thermostat are not available on the smartphone apps, this is not really detrimental. We bought 8 of the HR924UK radiator thermostats to go with this and the pairing went quite simply by following the instructions. I already had a very basic wireless thermostat which had been installed professionally, so I was able to connect the wireless module (this is separate from the thermostat but comes in the box) myself by following the wiring diagram at Honeywell's website for installers. Note that if you don't already have a wireless thermostat or you have the smallest doubt about connecting the wireless module, get a certified professional to avoid risk to life and property. Once everything is installed, you're on your way - you can name each thermostat around the house and decide what the temperature should be at different times of day in each room (the thermostat allows up to 10-minute precision). The thermostat touchscreen comes with a wizard to make this simple, or you can control the schedule with more control. The HR924 radiator thermostat regulates heat by opening and closing the valve as directed by the programmed schedule. There's a little noise as the motor turns, but after a while, you learn to tune it out. This combined system of the touchscreen thermostats and radiator controllers is very well thought out and includes options like always making a particular room a little warmer or cooler than the measured room temperature and showing which room(s) have caused the central heating boiler to come on. There could be some improvements (the battery life when the thermostat is moved from the base seems short and some features could be made more easy to access) but this has been one of my most satisfying purchases for a while.

### ⭐⭐⭐⭐⭐ Excellent Investment in an Efficient System
*by D***N on 1 April 2022*

It was an expensive investment to fit a large house with all the necessary radiator valves, but I am now consistently making savings of more than a third of my gas usage, measured over the first three months of 2022 compared with 2021. I'm writing this on 1 April 2022, a day when everyone's energy prices are rocketing, so I'm doubly pleased with this investment--I originally thought it would take years to repay the cost, but now it's going to be measured in months. Previously I had thermostatic radiator valves everywhere, but only one room thermostat, so edging up the temperature in the one main room for temporary extra comfort meant that heat was likely to be wasted everywhere else in the house--in effect there was only one control zone. With this system, almost every individual room is its own zone, and I can programme them for temperature and timing individually. Although we're using so much less energy, it's become very easy to focus where the heat goes and when. That means, for example, that the the living room can be heated quickly at a time when other zones are less important and programmed for lower temperatures, whilst the bedrooms can be left to their own devices for most of the day but warmed effectively overnight. The house feels more comfortable than before because the system is just so much more responsive. The central unit is easy to use, and the Total Comfort app supplements it by allowing more than one user to make adjustments--so when someone leaves their bedroom/home office for the evening after it's been heated all day, they can save energy by turning off the heat for that zone, maybe just for that evening. I did a totally DIY installation, but I would not necessarily recommend that for the faint-hearted or untrained buyer. Having researched other brands of smart thermostat systems and decided on Honeywell, I bought the kit and experimented with it as a dummy system, not actually controlling any radiators, nor connected to the boiler, until I understood how the programming works and could control a specimen valve at will. Then I gradually added the zone valves (in my case all my existing radiator valves were by Honeywell and the physical fitting was a breeze), and progressively changed the system wiring to use the new programmer instead of the old one (obviously that's the electrically challenging and potentially dangerous part). There was a fair bit of head-scratching along the way, but I'm really pleased with the result.

### ⭐ No Wifi
*by L***K on 28 March 2019*

No Wifi SSID's shown on the controller. Looking at the information screen the Wifi just sits at 'Please Wait'. In contact with Honeywell support in India and they are useless. They ask for info and photos, after you send them you get a reply 2 days later asking for the same thing, again and again, pointless. They now suggest sending down a firmware update even though you cant do that unless you have it connected to the Wifi ! They call themselves support ? I am sure this kit if great, I am still waiting to find out. Plus, the HR92 are the Western Europe variety and not UK, thus, the LED is upside down ! They have until today to try sort it or this will be sent back.

## Frequently Bought Together

- Honeywell Home THR99C3110 Smart Wireless zoning Thermostat, White, 139x101x21mm, Set of 2 Pieces
- Honeywell Home THR92H1002 evohome Wireless Radiator Controller Head for UK, White
- Honeywell atf500dhw - ACS Kit for Evohome,White,285 X 228 X 68

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-18*