Unit 206: Outcome 1 (Part) 2

Multiple Choice

Which of the following is a common feature of all immersion heaters installed today?

• They require a reset button or cut-out device

• They are rated at 5kW

• They cannot be repaired

• They only come in one size

Multiple Choice

What is a key disadvantage of open vented combination units?

• They are expensive to install

• They require multiple cisterns

• They lack head pressure

• They are difficult to maintain

Multiple Select

Which of the following components are typically found in a hot water cylinder system as shown in the diagram?

• Storage cistern

• Primary flow

• Cold feed

• Secondary return

Multiple Choice

If the air bubble in a single feed system is lost, what is the potential consequence for the water discharged from an outlet?

• Water will be colder

• Water will be brown

• Water pressure will increase

• Water will be clear

Multiple Choice

Which of the following best describes the process that occurs when cold water enters the cylinder and heat exchanger in a hot water system?

• Cold water is immediately heated and exits the system

• Air lock is formed, cylinder and primaries are full

• Water is heated and pushes air bubble into lower dome

• Cold water mixes with hot water and exits through the draw-off connection

Multiple Select

Which of the following are advantages of an indirect cylinder hot water system?

• Quick heat-up time

• Can be fully pumped

• Compliant with part L

• Risk of rusty water

Multiple Choice

What is the most popular form of solar water heating in the UK, and how does it work?

• Solar panels on the roof; fluid circulates to cylinder heating water

• Solid fuel units; heat water directly

• Wind turbines; generate electricity for immersion heaters

• Gas boilers; heat water via combustion

Multiple Choice

Which of the following statements best describes unvented hot water cylinders?

• They operate under mains pressure and do not require a CWSC in the loft.

• They have an open vent and require a CWSC in the loft.

• They operate at low pressure and need a vent pipe.

• They are only used in commercial buildings.

Multiple Choice

Which safety measures must be in place for an unvented hot water system installation?

• Temperature controls to prevent water exceeding 100°C, safe discharge pipes, maintenance by a competent person, and notification to local authority.

• Only temperature controls are required.

• Only discharge pipes are required.

• No safety measures are necessary.

Multiple Choice

Which of the following is a key feature of a combination boiler?

• It heats cold mains water instantaneously using a plate heat exchanger.

• It stores hot water in a large tank.

• It operates at low pressure.

• It requires a CWSC in the loft.

Multiple Choice

Based on the diagram, select all the points in the house where service valves are installed.

• Bath and hand basin

• Kitchen sink and shower

• Combination boiler and W.C. cistern

• Bath, hand basin, kitchen sink, and shower

Multiple Select

Select all the functions that the water jacket heater or thermal store unit can perform.

• Heating water for taps

• Heating water for radiators

• Storing cold water

• Regulating water temperature

Multiple Choice

Which component in a water jacket heater system is responsible for regulating the temperature of the water supplied to the property?

• Blending valve

• Overflow pipe

• Boiler

• Radiator

Multiple Choice

What are some important safety and maintenance features of modern immersion heaters used in domestic hot water systems?

• They require a reset button or cut-out device and have easily replaceable thermostats.

• They are always installed outdoors and do not require any safety features.

• They do not have thermostats and are not rated for specific power.

• They are only available in one size and do not require maintenance.