So you are interested in controlling your heating system with Honeywell evohome and trying to understand what evohome items you need? Firstly, we recommend using the Honeywell evohome System Builder (http://sb.evohome.honeywell.com/) to identify your basic requirements. If you have used the Honeywell evohome System Builder and are still looking for more information, below is our short guide to help you get the right products for your home.
Well first of all, Honeywell evohome is a fully wireless system and uses a proprietary RF signal on 868MHz to communicate to the other evohome devices. The latest Honeywell evohome Controller (ATC928G3000 launched in the UK July 2015 & part of the Honeywell evohome Connected Thermostat Pack) has a Wi-Fi adapter built in to it. This Wi-Fi connection is simply used for remote control using the Honeywell Total Connect Comfort App (via the Wi-Fi connection with your broadband router).
When evohome is used in a multi zone environment, the other wireless evohome devices communicate directly to the evohome Controller using a secure 2-way point to point communication protocol called 'Ramses II'. The RF signal used by evohome is truely excellent and typical range in a domestic property is 30m from the evohome Controller to the relevant evohome components. However, there are no wireless range extenders available for evohome, so if you have a very large property or a property constructed with materials known to cause existing RF issues, then we suggest your home is tested for RF signal strength with one of our RF test kits - RF Test Kit
Honeywell evohome is capable of being used in many different ways and with different heating technologies. Honeywell evohome is typically used with wet heating systems, however if configured correctly and installed within its limits, it can also work in electric only heating environments (such as infrared panels). Unfortunately you cannot use evohome with a combination of wet and electric heating.
Below are some examples of how Honeywell evohome can be used and what basic equipment you would need for the application.
A ‘Combi Boiler’ is a boiler that does not have a separate hot water storage cylinder and instead heats domestic hot water on demand. Honeywell evohome is fully capable of controlling the heating system connected to this type of boiler with a Honeywell evohome Connected Thermostat Pack. This type of appliance does not normally need a Honeywell evohome Hot Water Kit. If using evohome HR92 Radiator Controllers on all radiators with a Combi Boiler, we highly recommend an Automatic Bypass Valve (ABV) is installed in accordance with the boiler manuafacturers installation instructions.
A ‘Regular Boiler’ is sometimes referred to as a ‘Conventional Boiler’ and is normally a central heating boiler with a separate hot water storage cylinder and header tanks in the loft (this boiler type can also be connected to a sealed system kit and an 'unvented cylinder' and may not have tanks in the loft). The majority of Regular Boilers will be connected to an S-Plan (2 or more single port zone valves) or Y-Plan (mid-positioned or 3 port valve) system to allow the heat produced from the boiler to do heating, hot water or a combination of both. Honeywell evohome can control this type of boiler system with the Honeywell evohome Connected Thermostat Pack (heating) and the Honeywell evohome Hot Water Kit (hot water).
A ‘System Boiler’ is similar to a ‘Regular Boiler’ however these are attached to heating systems that are pressurised (normally to 1 to 1.5 BAR) indicated by a pressure gauge fitted on the boiler. All of the heating components required for the system (Pump, Expansion Vessel, etc) are usually fitted inside boiler. These are also capable of being controlled by Honeywell evohome, however caution must be taken as some existing boilers have manufacturers controls with integrated diverter valves inside the boiler instead of external controls such as S-Plan or Y-Plan and this may mean Honeywell evohome will not be fully compatible. Please Contact Us with your boiler make and model if you are unsure of anything before your purchase.
There are many system configurations that can be created for Regular and System Boilers and it can get complicated, so we advise if you are unsure of anything you speak to your installer or a member of our team before purchasing your evohome components in order to obtain exactly the right components you need.
'Heat Pumps' come in various forms (Air-to-Air, Air-to-Water and Ground Source) and are also capable of being controlled by Honeywell evohome. However due to the nature of Heat Pumps and the fact some Heat Pumps do not have buffer cylinders fitted (requiring in some cases 70% of the heating system to be uncontrolled) some technical advice will be required before purchasing.
‘Electric Boilers’, ‘Infrared Panels’, ‘Electric Towel Rails’ and ‘Electric Under Floor Heating’ are just a few types of electric heating common in many houses. Honeywell evohome can control electric heating only systems, however there are certain limitations of the evohome product as Honeywell evohome was designed for wet heating systems.
Honeywell evohome HR92 Radiator Controllers are required if you have radiators and are thinking of smart zoning your home. Smart zoning works by controlling the flow of water to each radiator and is a proven way of saving money by increasing the level of temperature control within your home. The Honeywell evohome HR92 Radiator Controller will fit to the majority of existing Thermostatic Radiator Valves (TRV’s), but please see our HR92 Compatibility Page to see if your existing radiator valve is compatible first.
Honeywell evohome can control multiple zones (rooms) of underfloor heating (UFH) served by a UFH manifold using the Honeywell Underfloor Heating Controller (HCC80R). The HCC80R can do 5 zones in standard form and a maximum of 8 zones using the Honeywell Extension Module (HSC80). An UFH manifold has 'thermal actuators' fitted to it to control the flow of water to the relevant heating zones and multiple thermal actuators can serve one zone. The HCC80R can power a maximum of 3x 230v thermal actuators for each UFH zone on the HCC80R and you can use multiple HCC80R zones grouped together for larger UFH areas. You can do more than 8 zones, however you would end up using a second HCC80R UFH controller (2x HCC80R would give you 10 zones without the HCS80 for example). Each UFH zone also requires a wireless zone thermostat and all the compatible UFH thermostats are found under our UFH section - Underfloor Heating Controllers Section