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What type of hot water system uses a combination vented 'Fortic' system?

• Centralised system

• Localised or single point system

• Gas storage water system

• Unvented mains fed system

Which type of hot water system includes an immersion heater as a component?

• Instantaneous system

• Storage system

• Gas fired system

• Electric system

What are centralised hot water supply systems usually installed in?

• Small apartments

• Medium to large domestic dwellings

• Commercial buildings

• Outdoor areas

Which component is typically used as a heat source in a direct open-vented hot water storage system?

• Gas boiler

• Electric immersion element

• Heat pump

• Solar panels

In a double feed indirect system, what is the purpose of the 15mm cold feed to the primary system?

• To provide a direct water supply to the hot water cylinder

• To act as a vent for the primary system

• To maintain the water level in the central heating system

• To supply cold water to the taps directly

What does the 22mm draw-off pipe in the single feed indirect system do?

• It supplies cold water to the cistern

• It acts as a vent for the system

• It draws off hot water to appliances

• It circulates water within the boiler

Where is the circulating pump located in the double feed indirect system?

• On the primary flow

• Within the boiler

• Above the level of the hot water cylinder

• Next to the cold water cistern

What is the function of the internal coil in an indirect open vented hot water system?

• It acts as a backup power source.

• It provides structural support to the cylinder.

• It acts as the heat exchanger to heat the stored water.

• It regulates the water pressure within the system.

When is the backup electric immersion often used in an indirect open vented hot water system?

• When the water temperature is too high.

• When the heat source is off or when the system is being serviced.

• During the regular operation of the system.

• When there is an excess supply of water.

What is the normal size of the primary feed and return pipework in an indirect hot water supply system?

• 15mm

• 22mm

• 28mm

• 35mm