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Book - School of Science and Technology

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MinLocal systems 569Dip-tube <strong>and</strong> anoderod connectorsRelief valve connectionAnode corrosioninhibitorGlass lined tankDip tubeHeat conservation fluebaffleInsulationSteel jacketThermostatIgnitorAccess doorRadial burnerSupportsGas pilotFigure 20.6 Storage type heater, gas fired (Andrews)Cold waterfeedHot water flow <strong>and</strong> ventWeep thermostatSeparate cylinder(90 to 270 litres)Economy valveto limit hotwater supply300mm MinWarm airheating unitcasingFlue to suitair heaterCirculator100 mmFigure 20.7 Gas circulator with warm-air heatingFor domestic multi-point service from storage, what are known as circulators may beused. One such, developed to fit within a domestic warm air heater, is shown in Figure20.7 <strong>and</strong> rated at about 4 kW. A cold water supply from a remote storage cistern must be

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