In a rack there a typically multiple strips of heat tape like Flexwatt or THG heat tape all wired together into a single circuit that gets plugged into the thermostat with the probe adhered to one heat strip. The same principal is involved using multiple under tank heaters(UTHs). You simply plug them all into a power strip and plug the power strip into the thermostat. Once again, all heat sources must be the sane size/wattage size for equal power output.
CAUTIONARY NOTE: Do not exceed the Herpstat 1's 500 watt power limit.
TheSnakeGuy
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