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Thanks for all your help with this. New unit installed and working as needed :)

I think the confusion here was born from the fact that old one is literally labelled "Boost HW/Heating" but the new one is "Boost Zone 1/2". Completely get what you're saying now about "Zone buttons" effectively doing the same job as the old units buttons. Thanks for your help on this. Will...

The old unit did just that :( Boost heating on one button, boost hot water on another.

Am i correct in thinking that given my parents have only the one thermostat that basically controls both upstairs and downstairs that i should really look at installing a 1 zone programmer instead? They have no intention of having a second thermostat installed. Puzzled as to why the person who...

Funnily enough, the R27-V2 is quite basic in terms of the buttons that are on display. "Boost HW" and "Boost Heating". That's pretty much all my parents do. They don't have timers set etc.

We had actually ordered a different unit but this is what was sent to us :( Was hoping i could just make it work with what was already there. Thanks for the input.

Hi, My parents EPH T27-HW programmer has kicked the bucket. Display completely dead, even after replacing CR2032 battery. It seems this particular model is as old as the hills and we pretty much can't buy it new anymore. Instead an EPH R27-V2 was purchased. However i'm finding it very hard to...