Coil Heaters | Custom Coil Heaters | Hot Runner Coil Heaters
NPH Coil heaters or otherwise known as sprue bushing heaters are electric resistance heaters which are composed of a straight or wire wound miniature helical coil resistance wire, magnesium oxide (MgO) insulation, a thin sheath metal shell (usually stainless steel that is later annealed) and a transition piece that connects the power and thermocouple leads to the heater.