Our mid 90s 4 bed Semi has just an On/Off switch for the immersion heater. Is this standard or is there a more efficient system?
Sounds foolhardy, unless said cylinder is contained in a vacuum.this may sound like sacrilege, but if your cylinder is pre-insulated, you're probably as well just leaving the immersion on (unless your going away for a while).
You're better off using this to heat it. Have you a timer on your boiler controls? Most do.Yes it can be heated with gas also