Northwest Flattanks introduced heated Flattanks with 3-inch insulating foam all around the tank (a 20.5 R value). Tanks are heated with a 12-volt Proheat X45 thermostat. Antifreeze is circulated around six heat probes and looped around the truck engine block. A Proheat heater is installed in the heated horizontal toolbox. Insulation foam is protected with a steel plate so Flattanks support trucks are designed for serviceability and functionality. They’re available in all tank sizes.

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