House in Chicago(cold weather) will be vacant for 3 months this winter. Water will be shut off and pipes drained, antifreeze in all traps, gas furnace turned down to 60 degrees also have backup heat source so house stays at 60 degrees inside. The only question I have is about gas hot water heater, I don't want to drain it. with water already off and pipes drained there won't be any pressure to the inlet side of tank, I'm going to leave several sink hot water faucets on to ease any pressure from outlet side of tank and leave tank heat level on at low setting. Am I ok. with hot water tank or am I missing something?