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

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 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 is the advantage of a C plan two-pipe semi-gravity central heating system?

• Not compliant with Building Regulations L1b

• Limited control on heating and hot water

• Lower efficiency

• Quicker heat-up time and compliant to building regulations L1B

What is the purpose of a heat sink in a two-pipe semi-gravity central heating system?

• To increase the efficiency of the boiler

• To regulate the air pressure in the system

• To control the flow and return temperature

• To dissipate heat without overheating the boiler

What type of system uses a pump to circulate heated water around the hot water and heating circuits?

• C plan two-pipe semi-gravity

• Two-pipe semi-gravity with heat sink

• Pumped central heating only

• Fully pumped systems