Last fall we purchased a 92 coleman arcadia. We are third owner and the person we bought it from said he had never used the water heater and he didn't know if it worked. Well, now we know why. We decided it might be nice to have hot water with a shower, so started investigating. I filled up the tank and water was everywhere. After ripping off insulation, there is a 4 inch gash at the top of the tank along a seam. My question-has anybody sucessfully patched a tank, or would you recommend replacing the whole unit? Likely other parts of the heater do not work as well, so if we replace the tank, we would just replace the whole unit. Comments?