Why is the control of domestic hot water temperature considered very important?

• To ensure the water is hot enough for cleaning purposes

• To prevent scalding accidents

• To save energy by using less hot water

• To make the water suitable for drinking

According to Building Regulations part 'G', what is the maximum temperature of hot water that should be delivered to a bath?

• 38°C

• 48°C

• 58°C

• 68°C

What device is used to ensure that hot water delivered to a bath does not exceed the maximum safe temperature?

• A thermostat

• A heating element

• A blending valve

• A pressure relief valve

How many people are reported to be seriously scalded by bathwater every year in British homes, according to the text?

• 600

• 6,000

• 60

• 60,000

According to Building Regulations part 'G', stored hot water must never exceed what temperature?

• 90°C

• 100°C

• 110°C

• 120°C

What happens to Legionella at a temperature of 47°C and above?

• It starts to grow rapidly.

• It remains dormant.

• It will be killed off.

• It has no effect on Legionella.

Why does Building regulations part 'L' require an efficient system to be installed for hot water usage?

• To reduce the amount of water used

• To ensure customer satisfaction

• To prevent wasted energy

• To increase water temperature

What must be done for the customer in addition to installing an efficient hot water system according to Building regulations part 'L'?

• The customer must be charged for the installation

• The customer must be shown how to operate the controls

• The customer must be provided with a warranty

• The customer must be given a manual

What is the main gas responsible for global warming and depletion of the ozone layer, as a by-product of heating domestic hot water?

• Methane

• Nitrous oxide

• Carbon dioxide

• Chlorofluorocarbons

At what temperature is lime scale produced when heating hard water?

• 60°C

• 65°C or above

• 55°C

• 70°C