Some questions regarding slightly different technology, for those who have experience with keeping an electric water heater/tank system (several hundred liters capacity) in good shape during a period of prolonged non-use (a few weeks or longer) in this climate:
- should the heater be left switched on or can it be turned off?
- if the heater is left on, should some water be run periodically?
- if the heater is turned off, should the tank be drained?
Thanks in advance for suitable information!