I have a Creda Sensair 70315/SFHA24 storage heater with 2 Knobs one with boost/comfort/combi/off and one with foom temp.numbers.there is 2 switches on the wall at the side off the unit do I need to have both wall switches on all the time,if I do the heater is hot allthe time even if I put temp;on a low setting

June, November 2010