Baxi Thermostat
Part no 227799
It will fit to following:-
Baxi Solo WM 20/4 RS
Baxi Solo WM 30/4 RS
Baxi Solo WM 40/4 RS
Baxi Solo WM 50/4 RS
Baxi Solo WM 60/4 RS
Baxi WM 20/4 RS SS
Baxi WM 30/4 RS SS
Baxi WM 40/4 RS SS
Baxi WM 50/4 RS SS
Baxi WM 60/4RS SS