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A boiler service must be carried out as preventative maintenance, so that the boiler's correct operation can be verified. In a correctly-administered service, the boiler is disconnected from the gas supply, and disassembled. The parts are then individually assessed and cleaned where necessary, with any faults noted. The chimney must be terminated correctly, and the flue test carried out must be satisfactory. In addition, all safety devices must work correctly, and the ventilation of the boiler must be up to standard. The operational pressure of the boiler in mBAR (millibars) must also be noted. In the absence of this information,the total heat input must be noticed, either in kW (kilowatts) or BTUs (British Thermal Units).