Hello, I wanted to consult you because I bought a 50 liter longvie high recovery hot water tank. the point is that my gas bill tripled ... I never thought it could be so much. My query is: Can I, while I am not in the day, lower the temperature knob so it does not have to be heating and raise it when I arrive at night from work? Will I manage to save some gas or spoil the hot water tank? Any other tips to save gas? I should have bought a water heater I know .... but it's too late :( Thank you.