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Under a centralised system, which type of hot water system uses a 'Combi boiler?

• Storage

• Instantaneous

• Thermal store

• Gas storage water system

Which type of hot water system is described as 'Open vented/cistern fed system' under the centralised system?

• Storage

• Instantaneous

• Gas storage water system

• Unvented mains fed system

Which of the following is NOT a sub-division of centralised open-vented hot water systems?

• The direct system

• The indirect system

• The double-feed indirect system

• The triple-feed, self-venting system

What type of centralised open-vented system uses a single feed and is self-venting?

• The direct system

• The indirect system

• The double-feed indirect system

• The single-feed, self-venting indirect system

What is a typical heat source for the direct open-vented hot water storage system?

• Gas boiler

• Electric immersion element

• Solar panels

• Heat pump

What is the single-feed indirect hot water storage cylinder also known as?

• A) Dualmatic

• B) Primatic

• C) Prismatic

• D) Dynamic

What is the function of the heat exchanger in the indirect hot water storage system?

• A) To cool the primary water

• B) To heat the secondary water

• C) To store excess water

• D) To generate electricity

What is the function of the 22mm vent pipe in the single feed indirect system?

• To supply water to the boiler

• To provide ventilation and prevent vacuum formation

• To circulate hot water through the system

• To drain the system when maintenance is required

In a double feed indirect system, what is the purpose of the 15mm cold feed to the primary system?

• To supply cold water to the hot water outlets

• To fill and maintain the water level in the central heating system

• To provide a direct water supply to the boiler

• To act as a vent for the central heating system

What is the role of the 22mm draw-off to the bath in the single feed indirect system?

• To supply hot water to the bath

• To supply cold water to the bath

• To drain the bath water into the system

• To circulate water between the bath and the boiler