Heating Replacement Spares have all the JOHNSON boiler parts you may require for your heating appliance, our boiler spares profile for JOHNSON spares are as follows JOHNSON Automatic air vent, JOHNSON Burners, JOHNSON Casings, JOHNSON Control knobs, JOHNSON Diaphragms, JOHNSON Electrodes, JOHNSON Expansion vessels, JOHNSON Fans, JOHNSON Flow switches, JOHNSON Gas valves, JOHNSON Gauges, JOHNSON Heat exchangers, JOHNSON Injectors, JOHNSON Microswitches, JOHNSON Printed circuit boards, JOHNSON Pressure switches, JOHNSON Pressure gauges, JOHNSON Pumps, JOHNSON Temperature gauges, JOHNSON Thermistor sensors, JOHNSON Thermocouples, JOHNSON Thermostats, JOHNSON Transformers, JOHNSON Wiring harnesses etc, when purchasing JOHNSON heating spares from Heating Replacement Spares you can guarantee you will receive genuine manufacturer JOHNSON boiler spare parts.