Calix Engine Heater Kit PH 1500L 1500w 115v Including US - Type B Plug Cables (30-50c) 18315031831503 Calix Engine Heater Kit with Cables PH 1500L 115v (30 50 C) Calix range of PH 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