WorksheetsChapter 007 hot water blue book Quiz
Total questions: 100
Worksheet time: 50mins
What is the primary focus of Chapter 007 in the learning material?
The history of hot water systems
The installation and maintenance of domestic hot water systems
The economic impact of hot water systems
The environmental considerations of hot water systems
Which of the following is NOT a topic you will cover in Chapter 007?
Selecting a hot water system
Types of hot water systems
Faults with open-vented water systems
The political implications of hot water system usage
What type of hot water system is described by B3 in the chapter outline?
Open-vented direct hot water storage systems
Centralised storage hot water systems
Open-vented indirect hot water storage systems
Combination centralised open-vented hot water storage systems
According to the chapter outline, which section deals with the protection against backflow and back siphonage?
E
F
G
H
Which section in the chapter outline addresses the installation of hot water pipework to BS 6700?
E1
E2
E3
E4
On what factors does the choice of a hot water system depend?
The color of the property and the number of windows
The size of the property and the distance to the outlets
The brand of the hot water system
The weather conditions and the property's insulation
What is one of the factors that should be considered when selecting a hot water system in terms of cost?
Decoration costs
Installation and maintenance costs
Entertainment costs
Gardening costs
Which of the following is a factor in choosing a hot water system related to water supply?
The color of the incoming mains cold water supply
The pressure and flow rate of the incoming mains cold water supply
The taste of the incoming mains cold water supply
The temperature of the incoming mains cold water supply on a summer day
What are the two main types of hot water systems mentioned in the document?
Centralized system and Decentralized system
Centralized system and Localized or single-point system
Internal system and External system
Automated system and Manual system
Hot water systems can be divided into how many distinct types?
One
Two
Three
Four
What are the two main types of centralised storage hot water systems?
Open-vented systems and closed-vented systems
Unvented systems and vented systems
Open-vented systems and unvented systems
Pressurized systems and non-pressurized systems
What is the key point about parasitic circulation?
It occurs in closed-pipe systems and is beneficial for heat retention.
It is a major cause of heat loss from hot water storage cylinders.
It enhances the efficiency of hot water systems.
It only occurs in unvented hot water systems.
What must the open vent pipe not be smaller than in an open-vented hot water system?
12mm
22mm
30mm
50mm
Why should the open-vent pipe not be taken directly from the top of the hot water storage vessel?
It can cause overheating of the system.
It can lead to water wastage.
It may result in parasitic (one-pipe) circulation.
It is against water safety regulations.
What minimum distance should the hot water draw-off pipe rise from the top of the cylinder to the open vent pipe to prevent parasitic circulation?
350mm
450mm
550mm
650mm
According to BS 6700, what is the purpose of the cold feed pipe in a hot water storage system?
To drain the system
To supply cold water to the taps
To allow for expansion of water when heated
To prevent airlocks within the system
Where should the cistern be placed to ensure good supply pressure?
As low as possible
At the midpoint of the system
As high as possible
At the lowest point of the cold feed pipe
What type of material must the boiler be made of in an open-vented direct hot water storage system to prevent rusty water being drawn off at the taps?
Plastic
Copper
Iron
Aluminum
What is the principle by which the hot water circulates from the boiler to the cylinder in a direct system with boiler?
Magnetic circulation
Forced air circulation
Gravity circulation
Pressure circulation
What is the usual temperature difference between the top and the bottom of a direct cylinder in a stored hot water system?
20°C
10°C
5°C
15°C
What is the recommended minimum pipe length for the primary flow and return pipes in a direct cylinder system?
28mm regardless of pipe length
28cm regardless of pipe length
18mm regardless of pipe length
28mm unless otherwise stated in the manufacturer's instructions
Why is it risky to connect direct cylinders to solid fuel back boilers without effective temperature control?
It can cause the system to overheat
It can lead to a high risk of scalding
It can result in inefficient heating
It can cause the boiler to underperform
What is the purpose of placing an immersion heater halfway down the cylinder for daytime top-up?
To heat the entire contents of the cylinder
To provide a quick heating method
To allow a time controller for daytime use with cheaper-rate electricity
To minimize the risk of freezing
What is the maximum recommended temperature for immersion heaters to ensure lower running costs and minimize scale build-up?
60°C
55°C
50°C
65°C
What is one of the advantages of choosing a direct system of hot water?
High risk of scale build-up
Quick heat-up time of water
High risk of scalding
Risk of rusty water
What is a disadvantage of using a boiler in a direct system of hot water when the wrong type of boiler is used?
Cheap to install
Quick heat-up time of water
Risk of rusty water being drawn off at the taps
Quick heat-up time of immersion-heater types
Why might there be a high risk of scale build-up in a direct system of hot water with a boiler?
If the water temperature is below 65°C
If the water temperature exceeds 65°C
If the system is cheap to install
If the heat-up time of water is quick
What is a potential risk associated with the lack of thermostatic control in a boiler used in a direct system of hot water?
Cheap installation
Quick heat-up time
High risk of scalding
Risk of rusty water
What is the suitable property size for a direct system hot water heater?
Suitable for small apartments only
Suitable for most houses
Suitable for commercial properties
Suitable for outdoor installations only
What is the typical storage capacity for a direct system hot water heater to serve four people?
120 litres
210 litres
300 litres
500 litres
Which type of electricity is mostly used with a direct system hot water heater?
Economy 10 electricity
Standard electricity
Economy 7 electricity
Renewable energy electricity
What is a disadvantage of using Economy 7 electricity with a direct system hot water heater?
It is less efficient
It is not available at night
It is more expensive than other types
The price of the electricity can be high
What is the primary advantage of the installation cost for a direct system hot water heater?
It is the most expensive option
It requires additional insulation
It is the least expensive of all storage systems
It includes free maintenance
What is a heat exchanger in the context of indirect hot water storage systems?
A device that cools down the water
A device that allows heat to be transferred from one water system to another
A device that purifies the water
A device that increases water pressure
What is the heat exchanger sometimes referred to as in an indirect hot water storage system?
A condenser
A calorifier
A boiler
A radiator
Which type of indirect hot water storage system is most common in UK domestic properties?
Single-feed self-venting indirect hot water storage cylinder
Double-feed indirect hot water storage cylinder
Direct hot water storage system
Open-vented direct hot water storage system
What is commonly found inside an indirect hot water storage cylinder to facilitate heat exchange?
A heat pump
A copper coil
An electric heater
A solar panel
In older-type cylinders, what is the alternative name for the smaller cylinder called an annular?
Circular cylinder
Double-feed cylinder
Expansion cylinder
Direct cylinder
What is the general practice regarding the installation of indirect cylinders in new installations?
To install them without cisterns
To install them with larger cisterns only
To install them in preference to direct types, even if the indirect flow and return are capped off
To avoid installing them altogether
What is the purpose of the two cisterns used in a double-feed indirect system?
One for cold water storage and one for hot water storage
One for cold water storage and one for expansion of the heating system
Both for expansion of the heating system
Both for cold water storage
What is the primary benefit of a double-feed indirect hot water storage cylinder in central heating systems?
It allows for direct heating of water by the boiler.
It prevents dirty or rusty water being drawn off at the taps.
It requires frequent changes of pipework.
It increases the risk of water evaporation.
How is secondary water heated in a double-feed indirect system?
By radiation from the boiler.
By conduction from the water storage cylinder.
By a separate electric heater.
By natural convection.
According to BS 1566, what must hot water storage cylinders conform to?
The minimum size of the cylinder.
The maximum pressure allowed in the system.
The minimum heating surface area of the heat exchanger.
The maximum temperature of water storage.
What is a requirement for new double-feed indirect systems as per Document L1a of the Building Regulations?
They must use gravity primary flow and return.
They must have a sealed heating system.
They must incorporate pumped primary circulation with controls to prevent energy wastage.
They must use larger pipe sizes to improve efficiency.
What change is typically made to the pipe size in new double-feed indirect systems to limit energy wastage?
Increased to 35mm.
Reduced to 22mm.
Maintained at 28mm.
No change is necessary.
What is the purpose of the second coil in an indirect cylinder for renewable energy hot water supply?
It is used with a conventional fuel source such as gas or oil.
It accounts for 70 percent of the cylinder's hot water volume.
It is dedicated to the renewable energy heat source.
It provides additional structural support to the cylinder.
What is the recommended pressure range for modern fully pumped heating systems that can be used with indirect cylinders for renewable energy hot water supply?
Up to 1.5 bar pressure
Up to 2.5 bar pressure
Up to 3.5 bar pressure
Up to 4.5 bar pressure
What is the capacity range of indirect cylinders for renewable energy hot water supply?
50 to 200 litres
100 to 250 litres
130 to 300 litres
150 to 350 litres
Which type of valve is used at the point where the 22mm or 28mm cold feed to the secondary hot water system joins the 22mm or 28mm full-way gate valve or lever type spherical ball valve?
Check valve
Pressure relief valve
Spherical ball type service valve
Float-operated valve
What is the size of the vent from the primary hot water system connected to the boiler?
15mm
22mm
28mm
32mm
How is the height of the vent from the secondary hot water system determined?
300mm above the highest radiator
450mm above the highest radiator
1m above the highest radiator
1m + 40mm per metre of system height
What is a consideration for choosing a double-feed indirect system based on property size?
Suitable only for small domestic properties
Suitable for all domestic properties when used with central heating systems
Suitable for commercial properties only
Not suitable for any domestic properties
What is the storage capacity variation for a double-feed indirect system?
Fixed at 210 litres for all properties
Varies with the number of bathrooms
Varies with occupancy, generally 210 litres for four people
Does not vary and is the same for all properties
Which type of fuel can be used with a double-feed indirect system?
Only gas
Only solid fuel
Gas, oil, solid fuel, electricity and renewable energy fuel sources
Only electricity
What is a disadvantage of installing a double-feed indirect system?
Less energy-efficient
Cheaper than direct systems
Does not require a second cistern
Expensive to install
What is a unique feature of the single-feed self-venting indirect cylinder?
It requires two cold water storage cisterns
It separates the primary heat from the secondary water using entrapment
It is no longer used on new installations and cannot be found in existing systems
It requires a separate feed and expansion cistern
How does the single-feed self-venting indirect cylinder prevent the mixing of primary and secondary water?
By using two separate heat exchangers
By using a special heat exchanger that works in such a way that the primary and secondary water are separated by a bubble of air
By using a direct cold water feed
By using a separate expansion vessel
What happens when the cylinder and heating system are full according to the text?
The system stops working.
A bubble of air forms on the underside of the top dome.
The water is heated and the system shuts down.
The primary and secondary water mix.
What is the purpose of the air bubble mentioned in the text?
To prevent the mixing of primary and secondary water.
To heat the water in the system.
To indicate that the system is full.
To allow the expansion of water to take place without breaking the air bubble.
What can cause the central heating system to lose circulation and hot water?
If the air bubble does not break.
If the system is too small for the heat exchanger.
If the air bubble expands almost every time the system is heated due to excessive water expansion.
If the air bubble is replaced with a double-feed indirect-type system.
What should happen if the air bubble breaks?
The primary and secondary waters should mix and the system should be turned off.
The boiler should be switched off and the system allowed to cool down.
The air bubble should re-form naturally.
The system should be drained and refilled.
What is forbidden under Document L of the Building Regulations?
Installation of any type of cylinder.
Upgrading to a double-feed indirect-type system.
Replacement of the cylinder with a like-for-like one.
Allowing the air bubble to break.
What is the referred-to self-venting cylinder often referred to as in the KEY POINT section?
Aromatic.
Primatic.
Ecstatic.
Automatic.
What is the common capacity of cold water storage in a combination cylinder for domestic use?
114 litres of hot water storage
40 litres of cold water storage
50 litres of cold water storage
30 litres of cold water storage
What is the purpose of integrating a cold water feed cistern and a hot water cylinder in a compact all-copper unit?
To provide a backup water supply in case of system failure
To increase the overall water pressure in the system
To provide adequate supplies of hot water when storage space is limited
To reduce the cost of heating water
Where should the isolation of the hot water for maintenance be done in a combination cylinder system?
At the cold water feed cistern
At the primary circulation pump
At the heat source
Via a full-way gate valve installed on the hot water draw-off pipe
What type of heat exchanger is used in the combination centralised open-vented hot water system depicted in the diagram?
A special heat exchanger that separates primary and secondary water
A standard boiler heat exchanger
A solar panel heat exchanger
An electric immersion heater
What is the main problem with the type of cylinder depicted in the image?
The hot water storage is too far from the taps.
The cold water storage is very close to the hot water cylinder, resulting in low water pressure at the taps.
The shower pumps can replenish the cold water storage quickly.
The cylinder is not compatible with power-shower pumps.
Where should the fortic valve be installed to improve the pressure at the outlets?
At the lowest point of the system.
As high as possible.
Next to the cold water storage.
Near the hot water draw-off.
What type of pumps should be installed for use with this type of cylinder to ensure the cold water storage cistern can feed the shower pump?
Gravity-fed pumps.
Power-shower pumps.
Submersible pumps.
Centrifugal pumps.
What is one of the advantages of a combination cylinder system?
It requires a lot of space.
It is difficult to install.
It is especially suited to flats and small houses.
It is suitable for pumped shower installations.
What is a disadvantage of a combination cylinder system?
Easy to install.
Suffers from lack of pressure unless installed at height.
Fully compliant with Document L of the Building Regulations.
Suitable for small properties and flats.
What is the storage capacity usually available for flats with a combination cylinder system?
114 litres.
210 litres.
45 litres.
30 litres.
Which type of electricity is best used with a combination cylinder system for fuel efficiency?
Economy 5.
Economy 7.
Standard rate electricity.
Prepaid electricity.
What is a key feature of the superduty hot water storage cylinder?
It has a single large-bore coil heat exchanger.
It has a multi-coil heat exchanger.
It requires more storage space.
It is less efficient than standard cylinders.
How long does it generally take to recover 45 litres of hot water using a superduty hot water storage cylinder (assuming a boiler output of 9kW)?
4 minutes.
15 minutes.
19 minutes.
45 minutes.
What is one of the advantages of a superduty cylinder system?
Requires large storage capacity
Very energy efficient
High initial cost
Not compliant with Document L of the Building Regulations
What is a disadvantage of choosing a superduty cylinder system?
Quick turnaround of hot water
High initial cost of the cylinder
Only small storage capacity needed
Fully compliant with Document L of the Building Regulations
Superduty cylinders are most efficient when installed alongside condensing boilers running at what temperature?
Minimum temperature
Maximum temperature
Room temperature
Below room temperature
What is the usual storage capacity of a superduty cylinder system?
50 litres
80 litres
100 litres
120 litres
What can reduce the fuel costs by up to 40 percent when using a superduty cylinder system?
Using Economy 7 electricity
Quick heating of the water
Using condensing boilers
Using an immersion heater
Which document is a superduty cylinder system fully compliant with?
Document A of the Building Regulations
Document B of the Building Regulations
Document L of the Building Regulations
Document M of the Building Regulations
What is the capacity of most immersion heaters as mentioned in the text?
3kW
120 litres
65°C
4 hours
How long does it take for a cylinder with a capacity of 120 litres to heat up from cold to around 65°C?
2 hours
4 hours
1 hour
3 hours
Which material is mentioned as the least resistant to corrosion and scale formation for sheath encasing the heater element?
Tinned copper
Incoloy 825
Titanium
Stainless steel
Which material offers the best overall resistance to corrosion and scale formation?
Tinned copper
Incoloy 825
Titanium
Stainless steel
At what temperature should water generally be kept to avoid scaling problems in hard water areas?
Just above 60°C
Just below 60°C
Exactly at 60°C
Above 65°C
What is the purpose of the sheath that encases the heater element in an immersion heater?
To increase the heating speed
To protect the element from the water
To make the heater element look better
To control the temperature of the water
Which of the following is a standard that all immersion heaters must comply with?
BS EN 60335-2-73:2001
BS EN 60335-2-73:2003
BS EN 60335-2-75:2003
BS EN 60335-2-76:2003
What is the purpose of the high limit thermostat in immersion heaters?
To increase the water temperature
To regulate water flow
To shut off the electrical supply if the heater overheats
To decrease the heating time
Maxistore immersion heaters are specifically designed for which type of hot water storage cylinders?
250mm side-entry
305mm side-entry
350mm side-entry
400mm side-entry
What feature of Maxistore immersion heaters helps to prevent overheating?
A high limit thermostat
A 3kW heater element
A no-heat zone (often called a cold tail)
An RTD combined thermostat and resettable safety cut-out
What is the capacity range of gas-fired storage water heaters mentioned in the text?
50 to 200 litres
75 to 285 litres
100 to 300 litres
150 to 350 litres
What is the Economy 7 electricity tariff?
A tariff that provides for seven hours of cheaper-rate electricity, usually between 1 am and 8 am
A tariff that provides for seven hours of cheaper-rate electricity, usually between 10 pm and 5 am
A tariff that provides for seven hours of cheaper-rate electricity, usually between 1 am and 8 am in the summer and 12 am and 7 am in the winter
A tariff that provides for seven hours of cheaper-rate electricity, only during weekends
What is one of the advantages of choosing a gas-fired storage water heater system?
High initial cost of the cylinder
Requires a flue
Quick turnaround of hot water
Siting of the heater can be difficult
According to the document, what is the storage capacity of gas-fired storage water heater systems for domestic models?
Up to 150 litres
Up to 250 litres
Up to 350 litres
Up to 450 litres
Which type of fuel is mentioned as suitable for gas-fired storage water heater systems?
Diesel and Kerosene
Natural gas and LPG
Electricity and Solar
Coal and Biomass
What is a disadvantage of gas-fired storage water heater systems?
Fully compliant with Document L of the Building Regulations
High initial cost of the cylinder
Suitable for all domestic properties
Up to 350 litres for domestic models
For a gas-fired storage water heater system to be fully compliant, which document of the Building Regulations must it adhere to?
Document A
Document L
Document P
Document X
What is the typical efficiency of the fuel heater mentioned in the document?
50 percent
85 percent
75 percent
95 percent
