WorksheetsHot Water System Installation white bookand Maintenance Quiz
Total questions: 85
Worksheet time: 48mins
What is the maximum diameter of pipework covered in the unit for hot water system installation and maintenance?
20mm
28mm
35mm
50mm
Upon completion of the unit, learners will be able to do which of the following for hot water systems and components?
Only install and decommission
Only inspect and soundness test
Install, service, maintain, decommission, inspect, and soundness test
Only service and maintain
Which learning outcomes are covered by practical tasks from the learner practical portfolio?
LO1, LO2, and LO3
LO4, LO5, and LO6
LO6, LO7, and LO11
LO8, LO9, and LO10
What types of properties are the focus of the unit for hot water system installation and maintenance?
Industrial and commercial properties of any size
Dwellings and industrial/commercial properties similar in size to domestic dwellings
Only domestic dwellings
Only industrial properties
What is the size of the vent pipe shown in the diagram?
15mm
22mm
28mm
32mm
Where does the vent pipe discharge into?
Directly outside
Into the CWSC
Into the bath
Into the main water supply
What type of valve is used in the hot water system as per the diagram?
Check valve
Gate valve
Spherical ball valve
Butterfly valve
What is the purpose of the top immersion heater in the hot water system?
To heat water during peak electricity rates
To cool down the water
To heat water using cheap rate overnight electricity
To heat water for day time top up
What is the function of the bottom immersion heater in the diagram?
To provide heating during the day
To work with the top immersion heater simultaneously
To heat water using cheap rate overnight electricity
To circulate water in the system
What is the purpose of a centralised hot water system?
To supply hot water to a single appliance only
To supply every hot water outlet from a central position in the property
To supply hot water for small amounts only
To supply hot water to outdoor areas exclusively
Where is a localised hot water system typically situated?
In a central position in the property
Near to where the hot water is needed
Exclusively in residential buildings
In outdoor areas only
Which of the following is a typical use for a localised hot water system?
Heating a swimming pool
Supplying hot water to an entire building
Supplying hot water to a kitchen sink in an office
Central heating for a large factory
What is a characteristic of an open vented hot water system?
It contains a vent pipe that is sealed from the atmosphere.
The water in the system can exceed 100°C.
It is fed with water from a cold feed cistern.
It does not contain a vent pipe.
How are unvented hot water systems supplied with water?
From a cold feed cistern.
Directly from the mains supply.
Through a vent pipe open to the atmosphere.
By a small hot water only boiler.
What type of hot water system heats the water instantly when a tap is turned on?
Open vented systems.
Storage hot water systems.
Instantaneous hot water systems.
Unvented systems.
Which of the following can be both open vented and unvented systems?
Instantaneous hot water systems.
Storage hot water systems.
Direct systems.
Indirect systems.
What are the two types of direct open vented hot water storage systems named after?
The type of hot water storage cylinders and the type of heating coil.
The type of taps and outlets they are connected to.
The type of hot water storage cylinders and the type of boiler or heater.
The type of vent pipe and the type of mains supply connection.
What does a direct hot water storage cylinder NOT contain?
A heat exchanger
An immersion heater connection
A primary flow connection
A cold feed connection
Which type of boiler is NOT suitable for use with a direct hot water storage system?
A small gas fired boiler
An electric immersion heater
A boiler that does not conform to Building Regulations Document L
A small back boiler situated behind a solid fuel fire
What must a boiler that is installed in a direct system hot water storage system NOT be made of?
A material that is likely to rust or contaminate the domestic hot water supply
A durable material that can withstand high temperatures
A material that is energy efficient
A material that is easy to clean
What is the consequence of not having temperature controlled and adequately powered boilers in new installations?
Increased energy efficiency
Reduced risk of contamination
They are susceptible to boiling
Longer lifespan of the boiler
What is the principle by which hot water circulates from the heat source in the system described?
Electromagnetic induction
Gravity using the principle of convection
Forced air circulation
Thermoelectric cooling
What is the term used to describe the phenomenon where the top part of the cylinder in a hot water storage system is around 10°C hotter than the bottom?
Condensation
Stratification
Radiation
Conduction
What should be the size of the primary flow and return pipework to ensure good circulation in the described hot water storage system?
15mm
22mm
28mm
35mm
What type of heating element do direct system hot water storage systems with electric immersion heaters use?
A 1KW immersion heater
A 3KW immersion heater
A 5KW immersion heater
A solar heating panel
What is the maximum temperature setting recommended for the immersion heaters in the system described?
45-50°C
55-60°C
65-70°C
75-80°C
How many immersion heaters are utilized by modern systems in a direct system hot water storage system with electric immersion heaters?
One
Two
Three
Four
What is the purpose of the top immersion heater in a direct system hot water storage system with electric immersion heaters?
To heat the entire cylinder
To heat the bottom third of the cylinder
To provide daytime hot water top up
To cool down the water
Why are immersion heaters in a direct system hot water storage system with electric immersion heaters time controlled?
To increase water pressure
To purify the water
To take advantage of cheaper over-night electricity
To prevent freezing in winter
What are the two different systems used in Open Vented Indirect Hot Water Storage systems?
The Open Vented Double Feed and The Open Vented Single Feed
The Closed Vented Double Feed and The Closed Vented Single Feed
The Open Vented Triple Feed and The Open Vented Single Feed
The Open Vented Double Feed and The Closed Vented Single Feed
What is the primary function of the heat exchanger in an Indirect Hot Water Storage Cylinder?
To transfer heat from the secondary hot water to the primary water
To separate the domestic hot water we use at taps from the primary heating water from the boiler
To cool down the water before it is used at taps and outlets
To directly heat the water in the storage cylinder
What type of metal is the coil within the Open Vented Double Feed Indirect Hot Water System made from?
Aluminum
Copper
Steel
Brass
What is the advantage of the Double Feed Indirect Hot Water Storage Cylinder in terms of metal use?
It allows the use of only aluminum
It allows the use of only copper
It allows the use of central heating boilers that use differing metals
It prevents the use of any metals in the construction
How is the water in the Double Feed Indirect Hot Water Storage Cylinder heated?
Directly by the primary water in the boiler
Indirectly by the primary water in the boiler via the heat exchanger
By an external heating element within the cylinder
By solar heating panels connected to the system
What is the purpose of the feed and expansion cistern in a modern sealed central heating system?
To provide a place for hot water storage
To accommodate any expansion of water when the water is heated
To supply cold water to the boiler directly
To circulate hot water through the system
How is the water in the cylinder heated according to the diagram?
By direct contact with the boiler
By a separate heating element within the cylinder
By the coil through conduction
By an external heat exchanger
What eliminates the need for a feed and expansion cistern in modern heating systems?
A filling loop and an expansion vessel
A larger boiler
Gravity circulation
A circulating pump
What is the function of the circulating pump in the updated system?
To heat the water
To fill the system with cold water
To circulate hot water through the coil
To store excess water from the system
What is the size of the vent from the secondary hot water system?
15mm
22mm
28mm
45mm
How is the vent from the primary hot water system connected?
To the secondary cold feed
To the boiler, the coil in the hot water cylinder, and central heating system
Directly to the hot water tap
To the primary flow and return pipes
What is the purpose of the special heat exchanger in the Single Feed system?
To heat the water directly
To cool down the water
To separate the secondary water from the primary (heating) water
To increase water pressure
What is the size of the cold feed to the primary system?
15mm
22mm
28mm
45mm
What is the function of the feed and expansion cistern in the diagram?
To provide hot water to the system
To store cold water for the system
To regulate the system pressure
To feed and expand the hot water system
What is the heat source for the system shown in the diagram?
Electricity
Gas, Oil or Solid fuel
Solar energy
Geothermal energy
Why does the indirect, single feed hot water system only require a single cold feed?
Because it uses multiple feeds for different purposes
Because it is installed in the same way as a direct hot water storage vessel and does not need a second feed
Because it operates entirely on electricity without the need for water
Because it uses a special filter to clean the water instead of a second feed
What prevents the primary water and secondary water in the indirect, single feed hot water system from mixing?
A one-way valve
A special heat exchanger that uses air bubbles to separate the two types of water
A chemical additive
A physical barrier within the storage cylinder
What happens when the air bubbles in the heat exchanger of the indirect, single feed hot water system rupture?
The system immediately shuts down
The primary and secondary water mix, leading to dirty water at the outlets
The water in the system becomes overheated
The air bubbles reform, and the system continues to operate normally
According to Building Regulation Document L, what is the status of the indirect, single feed hot water system?
It is the recommended system for all new installations
It is only allowed in commercial buildings
It no longer allows this system to be installed and is encountered during routine maintenance
It requires this system to be installed with solar panels
What do instantaneous water heaters use to heat water?
Stored hot water
Direct heat from a flame
Electricity from the main supply
Water directly from the cold supply
What are thermal stores also known as?
Water jacketed tube heaters
Instantaneous multipoint water heaters
Combination boilers
Single point heaters
At what temperature is the water in a thermal store surrounded?
Around 50°C
Around 60°C
Around 70°C
Around 80°C
How does the water from the mains cold supply get heated in a thermal store?
By passing through a series of heat exchangers
By direct heating from a boiler
By an adjustable thermostatic mixing valve
By a venturi tube creating pressure difference
What is the purpose of the adjustable thermostatic mixing valve in a thermal store?
To regulate the gas flow
To ignite the gas burner
To blend the water to a safe temperature
To create a pressure difference
Which component flexes due to the difference in pressure inside a gas-fired instantaneous multipoint water heater?
The venturi tube
The expansion chamber
The diaphragm inside the pressure differential valve
The thermostatic mixing valve
What triggers the gas burner in a gas-fired instantaneous multipoint water heater?
The opening of a tap
The closing of a tap
The heating of water to full hot water temperature
The blending of water in the thermal store
What is the main advantage of using a combination boiler for hot water supply in small to medium sized dwellings in the UK?
They can be installed outside the property.
They combine hot water supply and central heating in a single appliance.
They use less water than traditional boilers.
They are powered by electricity instead of gas.
What is the principle by which 'combi' boilers heat water?
By using a gas-only heating system.
By using a plate heat exchanger to alternate the flow of water through a diverter valve.
By heating the water once and then storing it.
By transferring heat from the central heating system directly to the tap water.
What happens when a hot tap is opened in a dwelling with a combination boiler?
The boiler stops supplying heat to the central heating system.
All energy created by the appliance is transferred into generating hot water supply to the open tap.
The central heating system increases its output to compensate for the open tap.
The hot water supply is cut off until the tap is closed.
What is the output range of the different types of combination boilers available?
10kW to 30kW
24kW to 50kW
15kW to 45kW
20kW to 60kW
What is the limitation of instantaneous gas water heaters mentioned in the text?
They cannot be used for large domestic dwellings.
They require electricity to operate.
They cannot generate enough flow rate to supply two open hot taps simultaneously.
They are not available as electric-type multipoint water heaters.
What are the two specific types of single point water heaters mentioned in the text?
Instantaneous and continuous single point water heaters
Storage and multipoint single point water heaters
Instantaneous and storage single point water heaters
Continuous and outlet single point water heaters
What is the maximum output of many electric showers as mentioned in the text?
3kW
12kW
15kW
10kW
What is the main feature of electric showers that allows temperature stabilization?
Low pressure cut-out
Microchip technology
Solenoid valve
Inlet control
What type of control do storage single point water heaters have?
Outlet or inlet controlled
Temperature or pressure controlled
Flow rate or volume controlled
Electric or gas controlled
How much hot water storage capacity do storage single point water heaters typically have?
Less than 10 litres
Less than 15 litres
Less than 20 litres
Less than 25 litres
What is the unusual feature of over sink point of use storage water heaters that acts as a safety feature?
They have a swivel spout that can direct hot water to different locations.
They drip water from the spout when the water is being heated.
They have a special tap that allows the heater to be vented through the tap spout.
They are fitted directly to the mains cold supply pipework.
Where are under sink point of use storage water heaters typically installed?
Above the appliance
Directly to the mains cold supply pipework
In cupboards below kitchen sinks in offices and small dwellings
Outside the building for safety reasons
What must be fitted if the pipework is not sufficient to accommodate the expansion of water in unvented under sink point of use storage water heaters?
Why do over sink point of use storage water heaters need to be inlet controlled to allow the outlet to vent out the expanded water?
To prevent the water from being over-pressurised due to heating and expanding
To direct the water to where it is needed
To comply with the Building Regulations enforcement
To deliver hot water at or near mains cold water pressure
Which type of point of use storage water heaters are not subject to the Building Regulations enforcement due to their capacity?
What is the purpose of a pressure reducing valve in a hot water system?
To increase the water pressure to the water heater
To limit the water pressure to the water heater
To allow water to expand within the system without creating excessive pressure
To protect the heater in the event of expansion vessel failure
Why is an expansion vessel used in a hot water system?
To remove any water away from the location of the heater
To prevent hot water from expanding back through the cold water supply
To allow water to expand within the system without causing excessive pressure problems
To protect the heater in the event of expansion relief valve failure
What is the main factor to consider when determining the quantity of hot water required for a building?
The distance of the property from the water source
The number of taps in the property
The number of people living at the property
The presence of a secondary circulation system
What is the risk associated with a long distance from the hot water source to the tap?
Increased energy consumption for heating
Risk of water contamination
Risk of wastage of water
Decreased water pressure at the tap
When is a secondary circulation system required in a hot water system?
If the hot water takes less than 30 seconds to reach the tap
If the hot water takes longer than 30 seconds to reach the tap
If the hot water source is less than the maximum distance specified by regulations
If the hot water source is instantaneous
What is the maximum recommended length for un-insulated hot water pipes with an outside diameter of over 28 mm?
20 m
12 m
8 m
3 m
Where is the secondary circulation connection usually positioned on the cylinder?
At the top of the cylinder
About 1/2 of the way down from the top of the cylinder
About 1/3 of the way down from the top of the cylinder
At the bottom of the cylinder
Which type of pump must be used in the secondary circulation system to prevent rusty water being drawn from the hot taps?
Steel pump
Plastic pump
Bronze bodied pump
Aluminum pump
What is often used to supplement the main source of heating in hot water storage systems during the summer months when heating is not required?
Gas boiler
Oil fired boiler
Central heating system
Electric immersion heater(s)
Why may more hot water outlets require a better flow rate?
Because it reduces the installation costs
Because it increases the efficiency of the boiler
Because it allows for a wider distribution of heat
Because the more outlets there are, the better the flow rate needed
What is the estimated saving on running costs over a 12 month period for some new systems such as solar hot water supply?
30%
40%
50%
60%
What must be considered when balancing the cost-effectiveness of a solar hot water supply system?
The initial high cost of the solar collector and special storage cylinder
The color of the solar collector
The brand of the solar collector
The size of the installation area
What have helped in the development of more fuel-efficient gas and oil boilers?
Decreased demand for hot water
Increased cost of manufacturing
Technological advancements
Government regulations
What is the purpose of feed and expansion cisterns?
To supply cold feed water to a heating system and accommodate any expansion of the water
To store hot water for domestic use
To filter impurities from the water supply
To heat water directly
What are cold feed cisterns designed to do?
Heat water using an immersion heater
Feed cold water, via the cold feed pipe, to an open vent hot water storage system
Store hot water for future use
Provide backflow protection
