Which of the following is NOT a type of instantaneous hot water system?

• Over sink

• Under sink

• Central heating system

• Electric shower

What is the primary function of an instantaneous hot water system?

• To store hot water for later use

• To heat water as it flows

• To provide central heating

• To cool water for drinking

What component is responsible for igniting the burner in a multi-point heater?

• Thermocoupling

• Pilot flame

• Venturi tube

• Diaphragm

What is the function of the combustion air in a combination boiler?

• To cool the system

• To provide air for combustion

• To heat the water

• To store the water

What is maintained through the outlet of the tap in a vented under-sink water heater?

• A closed circuit

• An open vent

• A sealed system

• A pressurized flow

How does the design of vented under-sink water heaters compare to over-sink types?

• Completely different

• Identical

• Similar

• Opposite

What is the function of the mains cold water supply in the diagram?

• To heat the water

• To supply cold water to the tap

• To vent the system

• To drain the system

What is the primary advantage of installing a vented under-sink water heater?

• It is cheaper than over-sink types

• It allows for better water pressure

• It saves space above the sink

• It requires no maintenance

Which type of localised hot water system can only be used for single appliances?

• Electric types

• Storage types

• Instantaneous types

• Solar types

What is the purpose of secondary circulation in a hot water system?

• To cool down the water

• To retain heat and supply hot water effectively

• To increase water pressure

• To filter impurities from the water