Full New Central Heating/UFH with Evohome

[gchd]

I am getting a new Central heating system installed and looking for advice on the best design. The heating system will consist of the following components:

WB Greenstar 24Ri ( exsisting boiler )
Megaflo.
1 Zone Underfloor heating.
15 Radiators.

I used system builder to build my system and got the below list of components.

ATP921R3100 evohome Wi-Fi base pack
ATF500DHW evohome Hot Water Kit
HR92UK evohome Radiator Zone Kit
Y87RF2024 Wireless Digital Room Thermostat
BDR91T1004 Wireless Relay Box

As It's going to be new central heating ( ie new pipes etc ), I am looking for advice on the design I can use to work with Honeywell Evo home.

[Richard]

Sorry for the delay in commenting.

If you follow the diagram on page 46 (page 48 of the PDF - https://thesmartthermostatshop.co.uk/in ... tachment=7), this is the design schematic what you need to achieve for this all to work correctly.

Boiler choice is the biggest thing that is overlooked in any (evohome) system design. Fine, if you have a Worcester 24Ri already, you are not going to get the best out of the evohome system as ultimately it is going to be on/off switching with a fixed flow temperature. A boiler that can work with the evohome system in some fashion (OpenTherm) is always going to be best, such as an Intergas Xclusive 24 and a Joule high gain cylinder (speak to the team at https://theintergasshop.co.uk for a full system setup like this).