UH, the guy who installed it should have turned the water on. - Edit 1
Before modification by everynametaken at 08/08/2010 05:46:29 AM
The heater is fed directly from your softener (if you have one). It should only take a few minutes to fill up. As for heating, a few hours, maybe 3 or 4 if you have is set low or if you have a particularly large one.