Hi all,
A plumber has fitted (on his recommendation) the following set up:
Boiler: Vaillant ecoTEC Plus 2 620
Controls: Vaillant sensoCOMFORT VRC 720F (including weather compensation)
Wiring Centre: Vaillant VR66/2
Cylinder: Mixergy MX150 Indirect
All was in and well from a central heating...