By moving a wire and taking a heating element out of the circuit, it would operate on 30 amps, but drying was slower. The gas combos had the burner on the bottom left side. The burner operated to heat water on the HOT setting, actually holding the timer until the water reached 120F and for MEDIUM, it filled with warm and heated it. The burner was next to the U-shaped porcelain outer tub. Eventually the intense heat of the burner operating during drying damaged the porcelain, leading to rusting of the tub and eventually, leaking. When installed on wooden floors, the gas burner charred the wood after disposing of the linoleum floor covering. People were sort of shocked when the machine was moved and they saw what it had done. They did not smell the wood charring since the blower was sucking the smoke through the machine and sending it outside.