Which document gives advice on how to satisfy the requirements of L1a and L1b regarding the design efficiency of domestic CH systems?

• BS EN 442

• BS EN 12828

• Manufacturers’ instructions

• Domestic Heating Compliance Guide (DHCG)

What is the main purpose of central heating?

• To provide cooling in every room

• To provide lighting in every room

• To provide ventilation in every room

• To provide thermal comfort within a property

Which type of heating uses an ‘indirect’ gas-fired heater to warm air circulated by a fan through ductwork under the floor?

• Warm air heating

• Electric storage heaters

• Wet central heating

• Air source heat pumps

When the outside temperature is −1⁰C, what type of central heating allows all rooms in a property to be heated at the same time to a specific temperature set by the customer?

• Full central heating

• Background central heating

• Pumped heating with gravity hot water

• Selective central heating

What type of system is installed mainly on a cost basis and uses a smaller boiler or heat emitters to only take the chill out of the rooms and heat the rooms to a lower temperature?

• Sealed, pressurised systems

• Pumped heating with gravity hot water

• Background central heating

• Fully pumped system

What has central heating been replaced with over the past 10 years?

• Open fire in each room

• Gravity hot water system

• heat pumps

• Electric storage heaters

What will the customer be mindful of when considering a central heating system?

• Maintenance

• Running costs

• Efficiency

• All of the above

What type of modern domestic central heating system is fed from a feed-and-expansion cistern located at high level?

• Sealed, pressurised systems

• Low-pressure, open-vented systems

• Fully pumped system

• Pumped heating with gravity hot water

What type of modern domestic central heating system is fed directly from the mains cold water and incorporates an expansion vessel to take up the expansion of the heated water?

• Low-pressure, open-vented systems

• Sealed, pressurised systems

• Fully pumped system

• Pumped heating with gravity hot water

What type of system is a more modern unvented or combination boiler system?

• Pumped heating with gravity hot water

• Fully pumped system

• Low-pressure, open-vented systems

• Sealed, pressurised systems