Hi, I am installing a new hot water tank, with 2 Thermowatt immersion heaters, one top, one bottom. I'm not sure which settings to use on the thermostat, they are both on the double dot at the moment. I've read that the lower one should be set slightly lower than the top. There are no temperature values, just double dot, single dot, and a +, - dial. Any help would be great.
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