Open Vented System: Feed and expansion cistern, Open vent pipe., Operates at atmospheric pressure, Cold feed supplies system water, Sealed System: Expansion vessel, Filling loop, Pressure relief valve, Operates under positive pressure, Gravity / Semi-Gravity Systems: Uses convection currents, Large diameter pipework, Slow heat-up time, Often uses solid fuel, Fully Pumped Systems: Uses a circulator pump, Faster heat-up time, Better system control, More fuel efficient, One-Pipe System: Cheaper to install, Radiators cool progressively, Poor temperature control, Not Part L compliant, Two-Pipe System: Separate flow and return, Equal radiator temperatures, Faster heat-up, More efficient operation, Heating Controls: Room thermostat, Cylinder thermostat, Programmer, Thermostatic radiator valve, Safety Devices: pressure relief valve, Open vent pipe, Automatic bypass valve, Frost thermostat,

Central Heating 07

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