Hello, Before installing the water heater, I am trying to setup a water heater drain pan that can handle any maximum possible water leak problem without the pan overflowing. I want to make sure that whatever possible leaks come from the water heater, that the water will not overflow the pan, and will drain out the pan drain pipe. 1) Is a 1 inch drain pipe from the water pan sufficient to drain enough water so the pan does not overflow in a worst case scenario? I don't know the max flow rate of a water heater rupture. Is it possible that the max flow could be an open cold water line with the local water pressure? I am thinking about doing 1.25 inch pipe for the pan drain, or even 1.5 inch. Is 1.5 inch overkill, or fine? 2) Does it help having a higher sidewall to the drain pan -say 4 inches high instead of 2.5 inches? Many drain pans are 2.5 inches high. Any help on this issue would be appreciated. We had a bad leak and don't want problems again. Thanks.