How can I repair a crack in copper on an “on demand water heater?
I have a fairly new on demand water heater that somehow got a crack in the copper pipe that coils around inside the unit. It is not possible to cut the bad place out and solder in another piece. After draining the lines, sanding and cleaning the pipe with acetone, I used JB weld. It lasted about 2 weeks and now I have the same problem again in the same place. The water began seeping from under the weld and runs out the edges of the weld. I took a drimmel and sanded off the weld that was over the crack. Does anyone have another suggestion than using the JB weld again. I can’t afford to replace the water heater.
