Honeywell Home Evohome Wireless Heating & Hot Water… (4512H)

£ 285.99INC VAT

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Honeywell Home Evohome Wireless Heating & Hot Water Wi-Fi Connected Thermostat Pack (4512H)

Sophisticated, wireless heating system can create and individually control up to 12 heating zones in domestic properties. Each zone has separate time and temperature settings. Will also wirelessly control domestic hot water and a mixture of radiator and underfloor heating applications within a system. Radiators can be controlled with Honeywell Home Evohome Electronic TRV heads (Code 1216H and 5769H). Allows the installation of multiple temperature sensing devices around the property without altering existing pipework, disrupting decor or damaging fixtures and fittings. Built-in Wi-Fi allows remote access via a tablet or smartphone. Suitable for any home with a hydronic (wet) central heating system. 4½" touchscreen display. Supplied with table-top stand.

  • Works with - Amazon Alexa - Google Home - iOS App - Android App
  • Temperature Range
  • Suitable for All Boilers
  • Mains-Powered with Battery Backup Thermostat
  • 2-Wire Receiver
  • Digital Display
  • 1 Year Guarantee
  • 4½" Touchscreen Display
  • Built-In Sensor to Control 1 Zone
  • Smart Hub & Internet Connection Required

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View all: Honeywell Home Wireless Thermostats

£285.99INC VAT

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Rated 3 out of 5 by from A decent system with caveats The Evohome system is a decent enough system. The main controller is overpriced, especially if you take into account features and standalone cost. The TRV valves without screens feel cheap and nasty, but aren't cheap. I can't speak for the screened versions. Battery life so far has been good, six months in and havn't replaced any of the originals that came with the system. Using the controller, the system responds well and keeps the rooms close to the scheduled temps. Overriding schedules for a one off temp boost on a single zone is clumsy and idiotic. Boosting all zones by x amount is a little better, but other systems do it far better being both simpler and faster. But here is where the good ends. If you are buying the evohome for regular remote adjustments, that is, when away from home or heading home, you'll find the system painful and frustrating, partially because the app regularly dies not work because Honeywell cloud servers are regularly down. This can last minutes to days I've found. But when it is working, my god is it slow, losing the app is like pulling teeth and anytime the app needs to talk to the cloud, make a cup of tea. I think Honeywell must be using an old Cyrix Processor server. But what I find stupid, is that when you are at home trying to use the app to control the heating, on your phone or tablet, it still uses cloud access to access the controller, so it's painfully slow to use when you're sat downstairs and the controller is just upstairs. In fact, I can walk upstairs and alter the heating direct in the controller in the time it takes for the app to load up and work. So that's what I do, making the app useless. So for a locally controlled heating system via the screen (controller) it's good. For anything remote from home or even just using the heating app while at home, its frustratingly unreliable. I.T. Consultant of 20 years.
Date published: 2021-12-24
Rated 4 out of 5 by from Long Term Review This is a review for about four years of use. Big old stone house that has big 26 x 4 column radiators, all been replaced and new 36KW boiler. First of all I like the functionality and controllability of the system. It's really easy to use and to set up. The main initial problem for me was location as it really struggled with all the HR92s communicating with the control panel and the panel communicating with the boiler relay. It really is now at the limit but has performed well once I got all the locations right. Over the last four years I've become absolutely and unhealthily obsessed with the boiler being on [what feels like all the time] as I can see when the green light on the relay is switched on. The house would feel OK so I'd check the main panel and all rooms would be at temperature - so why is something calling for heat!!!! Even allowing for a 4 minute delay that the manual says it can take for everything to communicate with each other, the heating would be on and all rooms would be at the required temperature. I'm guessing that the system requires the room to be at a "strong" temperature and not just "sneaked" into that temperature range, i.e., it doesn't just switch off when the set temperature is reached. The real problem for me, however, was the winter! The house is really cold and each room has one large column radiator that should be more than sufficient to heat that room. I was finding the boiler would be running constantly trying to heat one or two of the colder rooms. The room would be getting close to temperature but not quite enough. With some experimenting, I checked the HR92 on setting 10 to see what % the valve was open. I was finding that when the room is nearly at temperature, the HR92 would start restricting its opening. Now I understand why it is programmed this way but, for me, it just ended up with that room being maintained at "nearly" the right temperature and the boiler running continuously. What I wanted it to do was stay fully open, get the room to temperature and then switch off. So, I tried removing the pin in the HR92 that pushes the TRV valve open or shut. That meant that a given room was calling for heat but the valves in the large downstairs rooms were always 100% open. BINGO, the rooms got up to temperature and the heating switched off. I then did an OCD exercise checking the daily gas usage because it was so high. With the pin removed in the ground floor large cold rooms I found that when any room calls for heat, the hot water now always flows through the radiators in the large rooms. If only the large rooms call for heat then it, obviously, only flows through those radiators. My logic is that the boiler is fired up anyway and pumping hot water around the flow and return - it may as well flow through more radiators than just one because it's large enough to cope with more than one. Without this change I think I was effectively firing up the boiler in order to have hot water flowing around the flow and return and through one radiator where the opening was restricted and only allowing the temperature to be maintained. Very long winded, I know, but in summary, I think I'm saying to beware if you have a big cold house as this system struggles by trying to be too sophisticated. It would be PERFECT if the HR92s were either open or closed and not various percentages of being open or closed. Or PERFECT in a nice new insulated house.
Date published: 2021-02-17
Rated 5 out of 5 by from FANTASTIC! Best controls ever! We had a huge Gas bill in January 2019 so decided to do something about it. We ordered the controller and 14 TRV's for our house and have never looked back. It's so easy to control EXACTLY what you want - maybe turn off a room here, turn heating up there - and so easy to set up the controller. The cost to start off with seems to be a little expensive, however our entire system (cost over £1000 in total) has already more than paid for itself in the savings we have made! Can't recommend this highly enough!!!
Date published: 2019-10-28
Rated 5 out of 5 by from The best The best controller you can possibly get for your heating system giving you total control of every rad in the house up to 24 zones
Date published: 2019-09-24
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Do you sell the room stats for this

Hi, for zone control this needs compatible room stats, like "Honeywell Home T87RF2033 Single Zone Thermostat" can you also supply these ?
Asked by: CorkHeating

Will this work with an aga/Rayburn combination boiler

Asked by: GrandStevieGee

Will this work with a single pipe system

Asked by: stillnoidea
Yes, the one pipe system is irrelevant, not as good as a two pipe but doesn't affect the Evohome
Answered by: semiroundel
Date published: 2021-03-08


I have an existing thermal store hot water cylinder and need to know If evohome connect will work with this? thanks
Asked by: dafyddw
Yes, evohome can be used with a thermal store cylinder but you will need to purchase the evohome hot water kit (ATF500DHW) that comes with an insertion sensor.
Answered by: Honeywell Home Consumer Support
Date published: 2020-06-14

Any additional accessories needed to connect to the hot water?

I have seen Evohome packages on other web sites being sold with an additional hot water kit, which can add £125 to the overall cost. Will i need to buy this also?
Asked by: Mary2019
Good morning and thank you for your question. Unfortunately your question has come through to MK Electric as such I am unable to answer your question although we are owned by Honeywell we are a separate business to the heating controls. You will need to speak to Honeywell heating controls, they can be contacted via the following number: 0300 130 1299.
Answered by: Honeywell Home Consumer Support
Date published: 2022-09-07
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Batteries Supplied/Required 2 x AA Batteries Supplied
Brand Honeywell Home
Central Heating Control Type Thermostats
Colour White
Communication Protocol On/Off
Compatible Boiler Type All Boilers
Control Operation Digital
Display Type Digital Display
ERP Control Class Class VIII
Fixings Supplied Fittings Supplied
Frost Protection Frost Protection Setting
Heating System Mode Heating & Hot Water
Manufacturer Guarantee 1 Year Guarantee
Model Name Evohome
Pack Size 1
Parent Colour White
Pieces in Pack/Case 1
Product Type Wi-Fi Connected Thermostat Pack
Programme Facility Fully Programmable
Receiver Included Receiver Included
Receiver Mount Type Fits Standard UK Backplate
Receiver Power Source 2-Wire
Receiver Voltage 230 V AC
Smart Compatibility Smart
Smart Hub Requirement Smart Hub & Internet Connection Required
Suitable for Underfloor Heating Suitable for Underfloor Heating
Terminal Capacity Terminals accept 1mm² to 2 x 2.5mm² cables
Thermostat Mount Type Freestanding
Thermostat Power Source Mains-Powered with Battery Backup
Wireless/Wired Wireless
Wireless Range Restrictions Electronic interference from appliances or physical obstruction, such as brick walls, metal frames and floors, can reduce the wireless range. A signal weakens every time it encounters an obstruction.
Works with Amazon Alexa Works with Amazon Alexa
Works with Android App Works with Android App
Works with Apple HomeKit Does Not Work with Apple HomeKit
Works with Google Home Works with Google Home
Works with iOS App Works with iOS App

Product contents

Wireless 12-zone thermostat controller, table stand, power cable and BDR wireless relay box.


Instruction Manual