Part of Cox & Waite — Specialist Heating Engineers · Serving London & the South East
Honeywell Evohome installers across London
We only fit Evohome where it earns its keep.
Every room on its own schedule, at its own temperature, controlled from your phone. We design and install Evohome systems across London and the South East — more than 650 of them so far, from ordinary family houses to churches and Grade I and II listed buildings.
Honeywell Connected Specialists
Recognised Honeywell Installer Network members. Evohome is all we do.
12 zones (per panel)
All boilers
Heat pumps
The basics
What Evohome is, and how it works
A normal system has one thermostat in the hall making one decision for the whole house. Evohome makes one per room — each radiator controlled separately, on its own schedule. Nothing is wired between the parts, so it fits a house that is already lived in.
Your phone
the app, from anywhere
Evohome controller
holds every room's schedule and does the thinking
Radiator controllers
one per radiator
Room thermostats
for whole-room zones
Underfloor heating
via the manifold
Appliance control
boiler or heat pump
Hot water
cylinder — on top of the 12
All wireless. Only the phone needs the internet — the schedules live on the controller. Hot water runs as its own zone on top of the twelve.
The controller
A touchscreen that holds every room's schedule and does the thinking. Joins your wi-fi so the app can reach it.
Radiator controllers
One replaces the plain head on each radiator and controls that room by itself. Room thermostats and underfloor heating zones work the same way. Up to 12 zones (per panel).
The appliance module
Sits by the boiler and lets the controller fire it — or, on an OpenTherm boiler, turn it down rather than off. Works with all boiler types and with heat pumps.
The app
Change any room from anywhere, and see what is actually on.
An honest answer
Is Evohome right for your home?
It is not right for everyone. We would rather say so now than after you have paid.
It earns its keep when…
- Rooms used at different times — a home office, a spare room, bedrooms.
- Rooms that never balance: the one that is always cold, the one that cooks.
- A big or old house that is expensive to heat all at once.
- Irregular hours, or working from home some days and not others.
- Radiators and underfloor heating on one system.
- Old, listed or awkward buildings — nothing is wired between the parts, so there is no chasing walls. We have fitted Evohome in churches and in Grade I and II listed homes.
It is probably overkill when…
- A small flat, every room used at once — one good smart thermostat will do the same job for less.
- You set it in October and leave it. The savings come from zoning you actually use.
- You are replacing the heating system soon — sequence that properly first.
Works with: all boilers — combi, system and heat-only · heat pumps · wet underfloor heating, controlled at the manifold · hot water cylinders, as a zone on top of the twelve. Not sure what you have? Send us a photo of the boiler.
Smart Heating
Why Honeywell Evohome?
Over 650 systems in. Why our clients rate it:
Control From Anywhere
Adjust any room from your phone, wherever you happen to be.
Where the savings come from
Heating and hot water are around 79% of household energy use1. Zoning means heating only the rooms you're in. Resideo, citing BEAMA test data, report savings of up to 32% a year where Evohome with an OpenTherm bridge replaces manual valves and a mechanical thermostat — a test-environment figure, not a promise for your house2. Where your boiler is OpenTherm compatible, Evohome can modulate it rather than simply switching it on and off, which means better efficiency and steadier comfort.
Up to 12 Heating Zones
Why heat the whole house for one room? Up to 12 zones (per panel), each on its own schedule.
How Can We Help?
Whether you're new to Evohome or need support
New Installation
Free, no-obligation quotes. Two zones or twelve — we have done them all.
Existing Installation
System not behaving? Previous engineer out of their depth? We diagnose and fix it.
Expert Advice
650+ installs behind us. Ask us anything — impartial, no obligation.
It was such a pleasure to have the services of a real professional, skilled, tidy and courteous.
— Mr A. Reuben, Finchley
Common questions
The things people ask us
Will it work with my boiler?
Yes — all boiler types: combi, system and heat-only, as well as heat pumps. We have worked on shared and communal systems too. Where your boiler supports OpenTherm we can turn it down rather than just switch it off, which is where much of the efficiency comes from. Unsure? Send us a photo of the boiler.
Do I need new pipework or rewiring?
Usually not. The radiator controllers screw onto your existing valve bodies in place of the plain heads, as long as those bodies take the standard M30×1.5 thread — most do. Some older Danfoss, Comap and Oventrop valves need an adaptor, and a few need the body swapping; we check at survey. New wiring is the module by the boiler, plus a controller at the manifold if you have underfloor heating and a sensor if you have a hot water cylinder.
What happens if the internet goes down?
The heating carries on as scheduled. Schedules live on the controller, and it talks to the radiators over its own radio network rather than your wi-fi. You lose the app until it is back, nothing else.
How many rooms can I have?
Up to 12 heating zones (per panel), with hot water as a separate zone on top. A zone is usually one room — three radiators in the same room still count as one.
Can I start small and add rooms later?
Yes. Start where the difference will be obvious and add radiator controllers later. One caveat: Resideo's newer controller does not mix with the older HR92 kit, so we will tell you at survey which generation you are on and what that means for adding rooms.
Does it do hot water too?
If you have a hot water cylinder, yes — it becomes its own zone. With a combi there is no cylinder to control, so it is heating only.
What about underfloor heating?
Yes. Wet underfloor heating runs as Evohome zones alongside your radiators, through a controller at the manifold. Mixed systems are where it shines.
I already have Evohome and something is wrong with it
Half of what we do: systems never commissioned properly, zones bound to the wrong radiator, kit that has dropped off the network. We also work on the older HR92 and BDR91 generation.
Is it worth it, honestly?
In the right house, yes — the section above is a fair test of whether yours is one. What we will not do is quote you twelve zones you will never use.
Not covered? Just ask us.
About Us
Meet the Team
Oli Cox
MCIPHE RP RHP EngTech
Over a decade as a heating engineer and more than 650 Evohome systems installed. Honeywell Installer Network member, and a CIPHE member registered as an Engineering Technician with the Engineering Council.
Gas Safe engineer licence 5939258
Tony Waite
Specialist Heating Engineer
Deep expertise in heating systems and smart home technology. With Oli, sets the standard for workmanship and service at Cox & Waite.
Gas Safe engineer licence 5939259
Whole-home automation — lighting, security, blinds — is handled by our main practice, Cox & Waite.