NEW
Font size
WorksheetsImmersion Heaters Quiz
Total questions: 60
Worksheet time: 30mins
Which of the following is a requirement for all immersion heaters installed today?
They must have a built-in timer.
They require a reset button or cut-out device.
They must be installed outdoors.
They require a manual switch.
What is the power rating of domestic immersion heaters?
1kW
2kW
3kW
4kW
Which of the following lengths is NOT mentioned as a common size for immersion heaters?
27
14
11
20
What component is easily replaced in an immersion heater?
The heating element
The thermostat
The outer casing
The power cord
What are open vented combination units?
Units where the cylinder and cold water storage cistern are separate.
Units where the cylinder and cold water storage cistern are joined together.
Units that require extensive plumbing to connect to the mains feed.
Units that are difficult and time-consuming to install.
What is a disadvantage of open vented combination units?
They are difficult to install.
They require a lot of maintenance.
They lack head pressure.
They are expensive.
Where are open vented combination units commonly found?
In large houses.
In commercial buildings.
In flats.
In industrial plants.
What is an advantage of open vented combination units?
They provide high head pressure.
They are easy and quick to install.
They are very expensive.
They require extensive plumbing.
What is the term used to describe the temperature difference between the top (hot) and bottom (cooler) of a hot water cylinder?
Temperature gradient
Temperature stratification
Temperature inversion
Temperature layering
What is the purpose of a baffle installed in some hot water cylinders?
To increase the water temperature
To prevent incoming cold water from mixing with hot water
To decrease the water temperature
To allow cold water to mix with hot water
Up to what temperature difference can be observed in hot water cylinders due to temperature stratification?
5°C
10°C
15°C
20°C
Where is the cylinder stat placed in a hot water cylinder?
At the bottom of the cylinder
At the top of the cylinder
One-third of the way up the cylinder
Halfway up the cylinder
What is the name of the old system that only has one CWSC in the loft area and fills both the primary and secondary waters through the same pipe?
Double feed system
Single feed system
Triple feed system
Quad feed system
What type of cylinder does the single feed system use?
Hydraulic cylinder
Pneumatic cylinder
Primatic cylinder
Thermal cylinder
How does the heat exchanger in a primatic cylinder separate the primary water from the secondary waters?
Using a water filter
Using a chemical process
Using an air lock
Using a mechanical valve
What type of system is the single feed system in effect?
Direct system
Indirect system
Closed system
Open system
What could happen if the air bubble is lost in the system shown in the diagram?
The system will stop working completely.
The secondary water will mix with the primary water, causing brown water to be discharged.
The water will become too hot to use.
The system will start leaking.
What is the first step in the process described for the types of systems?
Air lock is formed, cylinder and primaries are full.
Water is heated and pushes air bubble into lower dome.
Cold water enters cylinder and heat exchanger.
Hot water draw-off connection is made.
What happens after the air lock is formed in the cylinder and primaries?
Cold water enters cylinder and heat exchanger.
Water is heated and pushes air bubble into lower dome.
Hot water draw-off connection is made.
Immersion heater connection is established.
Which connection is used for the primary flow in the system?
Cold feed connection
Hot water draw-off connection
Primary flow connection
Immersion heater connection
What is the purpose of the immersion heater connection in the system?
To allow cold water to enter the cylinder
To form an air lock in the cylinder
To heat the water in the cylinder
To push the air bubble into the lower dome
Which of the following is a disadvantage of a direct cylinder system?
Quick heat-up time
Cheap to install
Risk of rusty water
Can be fully pumped
What is an advantage of an indirect cylinder system?
Risk of scale build up
Expensive to install
Lack of temperature control
Various size cylinders available
Which system is noted for having a lack of pressure as a disadvantage?
Direct cylinder
Indirect cylinder
Combination unit
None of the above
Which of the following is a common advantage of both indirect cylinder and combination unit systems?
Quick heat-up time
Cheap to install
Lack of temperature control
Risk of rusty water
What is a disadvantage of an indirect cylinder system?
Quick heat-up time
Lack of CW storage
Two cisterns in loft area
Easy to install
What is one advantage of having a cylinder in a stored water system?
It provides instant hot water.
It is cheaper to install.
It offers a secondary heat source.
It takes up less space.
What is a benefit of stored water systems in areas with low water pressure?
They provide instant hot water.
They are more expensive to install.
They are suitable for areas with low water pressure.
They take up less space.
What is a disadvantage of systems with a cylinder and cisterns compared to a combination boiler?
They provide instant hot water.
They take up more space.
They are cheaper to install.
They have a shorter heat-up time.
What is a disadvantage of stored hot water systems compared to combination boilers?
They provide instant hot water.
They have a longer heat-up time.
They are cheaper to install.
They take up less space.
What is an advantage of stored water systems if the mains water supply is cut off?
They provide instant hot water.
They have a back-up supply of water.
They are cheaper to install.
They take up less space.
Which of the following is NOT mentioned as a method to heat domestic hot water?
Boiler and immersion
Solar panels on the roof
Solid fuel units
Electric heaters
How can solar panels and solid fuel units be incorporated into a domestic hot water system?
By using a single coil in the hot water cylinder
By introducing a second or third coil in the hot water cylinder
By using an external heating unit
By connecting directly to the water supply
What type of energy is mentioned as a means to heat water in a domestic hot water system?
Fossil fuel energy
Nuclear energy
Renewable energy
Geothermal energy
What must be included in the circuit of this system?
Water
Anti-freeze
Oil
Air
Which coil is connected to the solar circuit in this system?
Upper coil
Middle coil
Lower coil
No coil
What is the most popular form of solar thermal in the UK?
Solar air heating
Solar water heating via panels
Solar electric heating
Solar ground heating
Where are the solar panels typically installed for solar water heating in the UK?
On a north facing roof
On a south facing roof
On a west facing roof
On a flat roof
What percentage of a household's demand can solar water heating provide in the UK?
Over 30%
Over 40%
Over 50%
Over 60%
What is a common method of solar thermal mentioned in the text?
Using photovoltaic cells
Using evacuated tubes
Using wind turbines
Using geothermal pumps
What does the fluid do in a solar thermal system?
It generates electricity
It cools the panels
It circulates down to the cylinder, heating the water
It stores solar energy
What is a characteristic of unvented hot water cylinders?
They have an open vent.
They do not have an open vent.
They require a CWSC in the loft.
They operate under low pressure.
Why must safety relief be incorporated elsewhere in unvented hot water systems?
Because they have an open vent.
Because they operate under low pressure.
Because they do not have an open vent.
Because they require a CWSC in the loft.
What type of pressure do unvented hot water cylinders operate under?
Low pressure
Medium pressure
High pressure
No pressure
What does not having a CWSC in the loft imply for unvented hot water systems?
They operate under low pressure.
They operate under high pressure.
They have an open vent.
They do not require safety relief.
What is the function of the motorised valve in an unvented hot water system?
To control the flow of hot water
To reduce the pressure of incoming water
To strain impurities from the water
To measure the temperature of the water
Which component in an unvented hot water system is responsible for reducing the pressure of incoming water?
Line strainer
Expansion valve
Pressure reducing valve
Control thermostat
What is the purpose of the high limit thermostat in an unvented hot water system?
To control the flow of hot water
To prevent the water from overheating
To reduce the pressure of incoming water
To strain impurities from the water
Which component in the unvented hot water system is used to strain impurities from the water?
Line strainer
Expansion valve
Pressure reducing valve
Motorised valve
What is the function of the expansion valve in an unvented hot water system?
To control the flow of hot water
To allow for the expansion of water as it heats
To reduce the pressure of incoming water
To measure the temperature of the water
What is the maximum temperature that the hot water should reach in an unvented hot water system?
50°C
75°C
100°C
120°C
Where should the discharge pipes of an unvented hot water system be located?
In a visible place
In a safe place
In a hidden place
In a public place
Who must maintain the unvented hot water system?
Any person
A family member
A competent person
A local authority
To whom must installations of an unvented hot water system be notified?
The local authority or self-certified (Competent Persons Scheme)
The local fire department
The local police department
The local health department
What is the principle behind instantaneous hot water systems?
Heating water continuously
Heating water only when needed
Storing hot water in a tank
Using solar energy to heat water
How can instantaneous hot water systems be configured?
Only centralised
Only localised
Both centralised and localised
Neither centralised nor localised
What do instantaneous hot water systems use to transfer heat to cold water?
Solar panels
Heat exchangers
Electric coils
Gas burners
What is the primary function of a combination boiler?
To store hot water for later use
To heat up cold mains water instantaneously
To cool down hot water
To generate electricity
How does a combination boiler supply hot water to a property?
By using a large water tank
By using a plate heat exchanger with a large surface area
By using solar panels
By using a series of electric heaters
What type of system is a combination boiler?
Low pressure system
Medium pressure system
High pressure system
Variable pressure system
