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220-240V. Rith now iam trying to figure out, if its possible to drop the voltage, by regulator. Got discussion today with my friend elwcteician, that rectifier, voltage filter might help. ————— Im comparing to same foil and same flooring. Did by same person. Same manufacturer.

did all this before. Even plug the heating foil directly by an extension cord powered from my neighbour’s house. Tried a new foil with a different production year (same manufacturer). Village 3km away is powered by a different power plant and there is no problem at all. 3 electrician checked...

thread248-375754 Hello everyone. Have same issue. House structure is concrete, humms with or without floor,termostat, foil etc. Same heatng foil installed 3km away with no sound. Im from Slovakia. Guy who did the job never experienced situation like this. Did you solved this hum?