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what is ultra low EMF? how does it compare to just the regular carbon fiber heater.

Hello Patsey, EMF levels for each sauna are listed on the specifications ""tab"" of information. There is also a link to a PDF document that explains EMF and how we are exposed to it on a daily basis. For us, Ultra Low EMF = a heater producing less than 3 milliGauss. Low EMF = a heater producing between 3.1 and 10 milliGauss.