Understanding Heating Systems and Safety

Which of the following is a characteristic of a sealed (pressurised) central heating system compared to an open-vented system?

• It requires a feed and expansion tank in the loft.

• It operates at a higher pressure and uses an expansion vessel.

• It is only suitable for small properties.

• It cannot be used with combi boilers.

What is the primary function of a diverter valve in a combination boiler system?

• To increase water pressure

• To direct hot water either to the central heating or to the taps

• To remove air from the system

• To filter impurities from the water

Which method is commonly used to ensure continuous hot water circulation in a secondary return system?

• Gravity circulation

• Pumped circulation

• Manual filling

• Natural convection only

What is the main purpose of a system flush during heating system maintenance?

• To increase the system pressure

• To remove sludge and debris from pipework and radiators

• To add more inhibitor

• To check for leaks

Which British Standard covers the safety requirements for the installation of gas-fired hot water boilers?

• BS 7671

• BS 5440

• BS 6891

• BS 6798

What is the recommended minimum temperature for storing hot water in a cylinder to prevent Legionella bacteria growth?

Which of the following is a sign that a heating system may require balancing?

• All radiators heat up evenly

• Some radiators remain cold while others are hot

• The boiler cycles on and off rapidly

• The system pressure is too high

What is the main safety concern when working on an open-vented heating system in a loft space?

• Risk of electrical shock

• Risk of falling from height

• Risk of gas leaks

• Risk of scalding from hot water

Which component is used to automatically remove air from a sealed heating system?

• Pressure relief valve

• Automatic air vent

• Expansion vessel

• Thermostatic radiator valve

According to the Health and Safety at Work Act 1974, what is the primary responsibility of an apprentice working on heating systems?

• To supervise other workers

• To ensure their own safety and the safety of others

• To design new heating systems

• To issue safety certificates