The Beckett AFG caused some trouble this year when my grandchildren accidentally turned off the EMERGENCY OIL Burner switch at the top of the stair case.. For some reason it caused water to spray out flooding the floor. I'd like to know how this could be prevented? I was told by the repair man the unit could not be turned off without this happening. AND my 2nd question is if the water temperature is not hot enough will it cost more to heat the house?