If you have a suburban WH it would be a good idea to drain it occasionally and check for anode erosion. I usually put the anode back in after draining so insects will not get into the system. By the way, it would be prudent to open the relief valve before you take the plug out or you will suffer the consequences. It also helps to open the valve to let it drain faster, make sure the water is not hot also.
2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23
Camped 2015 - 47
Camped 2016 - 51 done - 6 more planned so far