My advice to anyone considering a cheap thermostat is to get a dimmer instead. BUT they can only be used by someone who is responsible, if you don't check temps every day, sometimes twice a day will be needed depending on your house temps, a dimmer isn't for you. The issue with cheap thermostats is that they are prone to failing and when they fail, they run at full power, when a dimmer fails, it cuts the power. The only reason I'm still in the hobby is because I had a dimmer as a back up to a cheap stat in the beginning-thanks to a friend's advice. A cheap thermostat IMO is anything less than a Ranco or Johnson.
As for your question about flexwatt, it would only work if the tanks were all exactly the same.
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