Can anyone describe differences between VRT350f and VRT370f? Both seem to be newer than VRT392f which is what I have and want to change it for something that actually displays in which heating mode it is... 350f seems to be available for purchase in UK although not officially listed on Vaillant website, 370f is only available in mainland Europe where both are available but can't really see how it differs from 350f (apart from black facia)
