[Decimus]

3rd Pic:

1) Oil supply. (Presumably the indicator lights under it will flash when it's running low.)

You do know what kind of fuel it uses right?

2) Extend by three hours.

3) Child lock (Press for three seconds.)

Presumably, pressing the button will extend the "Child Lock" by three hours, during which none of the 'adjust' buttons can work just so a kid doesn't mess around with your settings or something. (which can be dangerous) I suppose there must be some way to turn it off.

4) On/Off

Yes, this is a heater. I'd assumed that it was some kind of high-tech electric water heater, which is incorrect.

Previous translations should still be valid though.