vaillant vrc 700

Currently have an old Ecotec 428 (c2007) and am replacing with a new Ecotec 430. I've been very happy with old system, nothing wrong with it but replacing / moving location as part of a bigger project. I retrofitted weather compensation myself, its quirky but has worked fine for many years. I...

I have a Vaillant ecofit 425 heat only boiler on a Y plan system. Controls are all Vaillant, a VRC 700f, VRC 920 gateway, 16 radiators with 15 Ambisense TRVs, the one remaining radiator TRV free as a bypass. So far so good. I'm broadly happy with the system though the Vaillant app is unreliable...