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What components are more commonly included in modern system boilers?

• Thermostat, timer, and pressure relief valve

• Circulator, automatic bypass, and an expansion vessel

• Heat exchanger, pilot light, and flue

• Burner, control panel, and safety valve

What is the advantage of installing a system boiler?

• It is more energy-efficient than other boilers.

• It saves time and space on the installation.

• It can operate without electricity.

• It provides instant hot water.

When is a system boiler the preferred choice?

• When a non-sealed system is required

• When a sealed system is required

• When the lowest cost option is needed

• When the highest capacity is needed

What is the purpose of a sealed expansion vessel in a sealed system?

• To replace the feed and expansion cistern of the open system

• To provide a point at which the system can be filled under mains pressure

• To prevent the over-pressurisation of the system if the expansion vessel fails

• To incorporate a number of components to replace the feed and expansion cistern, cold feed and open vent

What is the function of a pressure relief valve (blow off) in a sealed system?

• To replace the feed and expansion cistern

• To allow the system to be filled under mains pressure

• To prevent the over-pressurisation of the system if the expansion vessel fails

• To incorporate components to replace the vent system

What is the purpose of installing a filling connection with a detachable filling loop in a sealed system?

• To replace the feed and expansion cistern

• To provide a point at which the system can be filled under mains pressure

• To prevent the over-pressurisation of the system

• To replace the vent systems seen previously

What needs to be installed to prevent the possibility of back siphonage of central heating water into mains water?

• A) A single check valve

• B) A pressure relief valve

• C) A double check valve

• D) A thermostatic mixing valve

According to the Water Regulations, what must be done with the filling loop after the system has been charged to the correct pressure?

• A) It should be left connected

• B) It should be inspected

• C) It should be disconnected

• D) It should be replaced

What needs to be fitted on both of the filling loop connections?

• A) A means of control

• B) A means of isolation

• C) A means of regulation

• D) A means of detection

What components are typically included in the installation shown in the image?

• Expansion vessel, pressure gauge, and vent pipe

• Expansion vessel, pressure relief valve, and a filling loop

• Expansion tank, safety valve, and a drainage loop

• Expansion chamber, pressure release valve, and a service loop