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Understand that thanks. The Biasi instructions state "If a programmer/room thermostat is to be fitted remove the red link between L1 and L3 and connect the device across these terminals. Any external controls fitted must be rated at 230V 50Hz and have volt free contacts." - which typically...

Thanks ianmcd, nice to have my thinking validated. So switching the link wire to t2 and taking the switched live from t4 would work the same on the C17 then. On the hive (single channel receiver) it would be switched live on t3 and a link from live to t1 Still not sure why the controller is...

Yes. Setting up a Hive itself will be a doddle. Problem is working out what is going on with the existing setup on the Horstmann C17 as it is definitely not one of the more standard setups. Terminal 2 should be boiler live (and according to the Biasi instructions volt free) but what is...

Appreciate that but the intention for now is a quick-fix by just replacing the existing timer so that we can monitor and remotely regulate the temperature for her.

Can't get a photo at the moment but here's a pic of the type of diverter valve fitted. The valve is manual operation, there are no electrical connections to the cylinder or valve.

Intending to replace elderly in-laws boiler Horstmann C17 timer with a Hive wireless thermostat but confused by the existing wiring. The boiler is a Biasi Riva OV but has a strange setup in that it has no external thermostat and a manual heating/hot water diverter valve (Servowarm valve). Due...