Honeywell timer wireless

[Lee daron]

hello I have a Worcester greenstar 18Ri with a Honeywell st6400c timer next to the boiler and a dial thermostat down stairs. it is a system boiler not a combi and has a separate hot water tank. I'm looking to find out if I can replace my Honeywell timer st6400c for a Honeywell sundial RF2 pack 3 as I'm wanting to go wireless. thanks

 

[Deleted member 120897]

Yes, this should be ok to upgrade