My 9yr old HW heater on the L4000 has a cracked housing and is leaking quite a bit of water. I checked on a new one and my distributor wants $1,800. Does anyone have an alternative source for these box type units? I'm considering removing the L4000 this spring and replacing it with a new Tandem unit. Hate to drop $1,800 on a HW Htr for few couple months of time.