I don't have any personal experience with Deka water heater, but as I read the comments above it seems the heaters are not properly installed. After reading for all those comments I suddenly got to remember about the heater, my sister installed last year. The place where they installed it was getting water stain mark all over the wall. So she wanted to change the place of the heater and wanted to repair a few things, so she contacted the Heater repair Goleta for helpful hints. Likewise, you can also contact them through their website and get a solution over heater repair.