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RE: DIY Heated Tile Floor - Let There Be Heat
The remodel is coming along nice. We opted for a heated floor as well. My current tester was busted so it took a couple day to get a new one to make sure everything was working right. Man would it suck to finish your tiling only to find out it did not work.
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Oh yeah. That would be horrible. I don't know that I have the energy to tear out the floor and start over. This is looking like it is going to turn into a > 6 month project without any rework.
I think that the low voltage continuity tests that you can do with a plain old multimeter will tell you whether or not the heater will work. They just tell you if the heater wire is broken or shorted out.
The high voltage insulation tester seems like it is supposed to give you an indication of a tiny flaw that will shorten the life of the heater wire. If you have an insulation defect it might only show up as a 1 MOhm resistance, but over time the leakage current would cause corrosion of the heater wire.
We had a similar problem with some poorly insulated power lines buried in the ground between my house and my shop. Someone had damaged the insulation and just wrapped it up with electrical tape. It worked for a few months until the wire corroded through.