Automated Production Systems developed the VariFlame variable rate heater to serve as a modulating heater that works with any control system. It synchronizes and adjusts with temperature curves set in the controller to maintain desired room temperature. VariFlame connects to the company’s Edge controller to provide users with remote access to the heater from a single system. The heater features a stir-fan mode and an exercise mode. The stir-fan mode allows producers to continue circulating air through the heater without turning on the burner, while the exercise mode allows Edge to automatically turn on the heater at scheduled times. In addition, VariFlame offers an extended range from 50,000 to 250,000 Btus, which allows it to run longer and provide better heat distribution, according to the company.