hot water

Which of the following is a characteristic of a centralised hot water system?

• Supplies hot water to a single appliance

• Usually sited near to where the hot water is needed

• Supplies every hot water outlet from a hot water vessel, heater, or boiler

• Only used for small amounts of hot water

Answer explanation

A centralised hot water system supplies every hot water outlet from a hot water vessel, heater, or boiler, making it a characteristic of this system.

What is a localised hot water system typically used for?

• Supplying hot water to every outlet in a property

• Supplying hot water to a single appliance

• Heating large amounts of water

• Central heating systems

Answer explanation

A localised hot water system is typically used for supplying hot water to a single appliance, not every outlet in a property or heating large amounts of water.

Which of the following is NOT a feature of a localised hot water system?

• Usually sited near to where the hot water is needed

• Supplies hot water to a single appliance

• Used for small amounts of hot water

• Supplies every hot water outlet from a central position

Answer explanation

The correct choice is 'Supplies every hot water outlet from a central position' as it is not a feature of a localised hot water system.

Which type of hot water system contains a vent pipe that is permanently open to the atmosphere?

• Open vented systems

• Unvented systems

• Instantaneous hot water systems

• Storage hot water systems

Answer explanation

Open vented systems have a vent pipe that is permanently open to the atmosphere.

What is a characteristic of unvented hot water systems?

• They contain a vent pipe.

• They are fed with water from a cold feed cistern.

• They are supplied with water directly from the mains supply.

• They store an amount of hot water in a central location.

Answer explanation

Unvented hot water systems are supplied with water directly from the mains supply, eliminating the need for a vent pipe or cold feed cistern.

Which type of hot water system heats the water instantly as it is required when a tap is turned on?

• Open vented systems

• Unvented systems

• Instantaneous hot water systems

• Storage hot water systems

Answer explanation

Instantaneous hot water systems heat water instantly as it is required when a tap is turned on, making them the correct choice for this type of system.

What do storage hot water systems do?

• They contain a vent pipe.

• They heat the water instantly as required.

• They store an amount of hot water in a central location for distribution.

• They are supplied with water directly from the mains supply.

Answer explanation

They store an amount of hot water in a central location for distribution.

Which of the following is NOT a type of hot water system mentioned in the document?

• Direct systems

• In-direct systems

• Thermal store

• Solar water heaters

Answer explanation

The correct choice is 'Solar water heaters' as it is NOT mentioned as a type of hot water system in the document.

What type of hot water storage cylinder is used in direct open vented hot water storage systems?

• A combination boiler

• A direct-type hot water storage cylinder

• A thermal store

• A multipoint heater

Answer explanation

In direct open vented hot water storage systems, a direct-type hot water storage cylinder is used to store hot water directly from the boiler.

What type of cylinder does not contain a heat exchanger and is heated directly by either a hot water only boiler or an electric immersion heater?

• Indirect hot water storage cylinder

• Direct hot water storage cylinder

• Central heating system cylinder

• Combination boiler cylinder

Answer explanation

A direct hot water storage cylinder does not contain a heat exchanger and is heated directly by either a hot water only boiler or an electric immersion heater.