NACHI releases a free, online Water Heater TPR Valve Discharge Piping mini course.

http://www.nachi.org/waterheaterdischargepipingcoursereleased2007.htm

Nice little course. Highly recommend that this be made available to anyone and everyone.

Here is an interesting video.

Water Heater Blast: Low Resolution (for dial up users)
Water Heater Blast: High Resolution (for hi-speed users)

How many CEU’s is it?