Since many of the thermostats are “dual Voltage” do they convert the power so I can mix mats?

No. All mat voltages must match incoming Line voltage. 240v circuit must be used with only 240v mats. Combining mats of different voltages on a circuit or supplying the incorrect voltage to a mat cannot be done under any circumstances.

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Why do you recommend I wait 28 days to use my new system after thinset & tile are down?

This is based on the recommendation of thinset and grout manufacturers. Their products require a curing period before the masonry reaches its full strength. This process cannot be rushed by heating and apparently, the process can be adversely affected by...

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