Hello world experts of the boneyard. The water heater in the house we just bought has been "knocking" quite a bit. During the inspection the dude used the term "probably near the end of its useful life." I'm thinking I'm gonna flush it and bite the bullet to replace it come tax return time. Anyone ever do this? Online says it runs about a 100 bucks which isn't awful but also doesn't seem terribly tough. I'd hate to try it and screw up though. Not the e handiest when it comes to this stuff.