Heater Hotter(TM) solves the problem of slow warm up times and waiting for your vehicle to thaw in winter months. Heater Hotter formulated specifically to accelerate the transfer of heat from engine to cooling system in frigid climates that otherwise increase engine wear. Heater Hotter’s unique formula allows your vehicle’s heater to warm up 50% faster in even sub-zero temperatures and is safe to mix with all types of anti-freeze. Just simply add to your radiator.