Calix Engine Heater PH1000L 1000w 115v (30-50c) 18331031833103 Calix Engine Heater PH1000L 115v (30 50 C) Calix range of PH Engine Heaters are manufactured for longevity, quality and ease of installation. They can be installed passively using the thermosiphon principle, or if an optimum position isn't available then an additional transformer & pump kit can be purchased to circulate coolant through the system. An industry leading 3 year warranty is offered on all Calix products. The PH is available in two