Jim posted about using the anode to drain the tank.
I drain my tank using the low point drain. With the red low point drain open, I pop the pressure relief valve and drain the hot water tank when the rest of the system drains. That way when I take out the anode there is only a tiny bit of water left. Make sure you reseat the pressure valve and not leave it open all winter or it will not reseat properly.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW