Range cooker gas cooker freestanding cooker standard width 100 cm energy rating a hob type gas capacity 60 litre heating types grill dough proving preheat features glass viewing window controls retractable controls functions auto programmes self cleaning safety feature flame safety device number of burnerszones 6 size medium number of ovens 2 width 100 cm height 90 cm depth 60 cm colour silver manufacturer specific features catalytic mai