you can definitely stack tubs with flex or UTH's as a heating source. However, Flex should ONLY be used in conjunction with a reliable thermostat, not a dimmer. This is because you're creating a fire hazard with uncontrolled flexwatt.
Also, you should only use the same size and wattage pieces on the same thermostat. If you have a 4'', 1 foot piece and an 11'', 1 foot piece connected to the same thermostat you're going to have the two pieces be two different temps because the 11inch is a higher wattage than the 4''.
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