Worksheets6035 8202 Hot water systems
Total questions: 30
Worksheet time: 15mins
Which regulation covers hot water installations
Building Regulations Approved Document G3 2010
Building Regulation Approved Document A 2010
Building Regulation Approved Document H 2010
CIBSE Central Heating Design Guide
What does the building Regulations approved Document L1a/b cover?
Cold water installations
The conservation of fuel and power
Gas installations
Oil installations
In the Water Supply (Water Fittings) Regulations 1999 which section covers hot water supply?
Section 6 Schedule 4
Section 4 Schedule 6
Section 5 Schedule 7
Section 8 Schedule 2
What does the Gas Safety (Installation and Use) Regulations 1998 deal with?
Installation of Hot and Cold water?
Installation of oil fired appliances
Installation and maintenance of gas fired appliances
Installation of solid fuel fired appliances
What are the factors that affect hot water systems?
Customer needs/occupancy and purpose
Building layout and features
Energy efficiency
Environmental impact
Electrical requirements
If manufacturers' instructions are unavailable, where can we obtain or source a copy from?
Manufacturers' website
Library
Next door neighbour
Plumbers merchant
What is the maximum length of dead leg for a 15mm or 22mm pipe before a secondary return system has to be installed?
5m
8m
10m
12m
Are combination boilers suitable for large houses with multiple bathrooms?
Yes
Yes if we oversize the boiler to give a better flow rate
Yes if we fit a booster pump to the cold inlet to the boiler
No, only suitable for smaller properties with one bathroom
What is meant by the term 'centralised systems' ?
Hot water is delivered by single point units at each appliance.
Hot water is delivered to a central point from all hot water outlets in the dwelling.
Hot water is delivered from a central point to all hot water outlets in the dwelling.
Hot water is supplied by a single point water heater.
What is meant by the term open vented system?
Hot water is supplied by a combination boiler.
Hot water is supplied by a multipoint water heater.
Hot water storage system that is fed by a cold water storage cistern in the roof space and contain a vent pipe that is open to the atmosphere.
Hot water storage system that is fed by a mains fed unvented cylinder.
On an open vented hot water storage system, where should the open safety vent pipe be positioned?
A minimum of 450mm over the feed and expansion cistern.
A minimum of 450mm over the roof tiles.
A minimum of 250 over the cold water storage cistern.
A minimum of 450mm over the cold water storage cistern.
The size of the cold water storage cistern feeding a hot water storage cylinder should be?
Smaller than the capacity of the cylinder.
Have a BS1212 Part 2 float operated valve fitted to a smaller cistern.
Have a cistern equal to the capacity of the cylinder. As per BS 6700.
Be at least 230 litres capacity?
On an open vented hot water storage system, what is the smallest diameter of open safety vent pipe allowed?
15mm
12mm
28mm
22mm
Can the cold feed supplying an open vented hot water storage cylinder be used to supply the cold to a shower pump or other appliance?
Yes
No
Yes if you fit a double check valve after the tee on the cold feed to the cylinder.
Yes if you fit an automatic air vent.
What is meant by an open vented direct type cylinder?
A cylinder that contains no form of heat exchanger, but is heated either by a small hot water only boiler or immersion element.
A cylinder that has an annulus type heat exchanger and an electric immersion element.
A cylinder that contains two coils one for heating by a conventional boiler and one for heating by solar thermal.
A combination cylinder, also known as a Fortic cylinder.
What are the size of the tappings for the primary flow and return connections on a direct open vented hot water cylinder?
28mm male thread
22mm female thread
3/4" BSPT female thread
1" BSPT female thread
What is the minimum diameter for the flow and return pipework on a gravity circulation system to a open vented hot water cylinder?
15mm
28mm
35mm
22mm
On a direct type open vented hot water cylinder fitted with twin immersion elements, what temperature should the immersion heater thermostats be set to ?
70oC
40oC
55oC
60oC
What is meant by the term an indirect type hot water storage cylinder?
A cylinder that has no means of seperating the primary and secondary waters.
A cylinder that contains a type of heat exchanger that uses the primary water from the boiler to heat the secondary water in the cylinder.
A cylinder that heats the secondary water by immersion element
A cylinder that heats the water via a solar panel on the roof.
What is a 'primatic' cylinder?
A single feed, indirect self venting cylinder.
A double feed, indirect cylinder
An unvented cylinder
A galvanised hot water tank.
Can a system that uses 28mm flow and returns and a gravity type means of circulation to heat the cylinder be fitted as a new installation?
Yes
Yes if we fit a motorised zone valve and cylinder thermostat.
No, it must be a fully pumped system with full controls
Yes if we increase the primary flow and returns to 35mm
A cylinder with twin coils has been developed for use with....
Solar thermal or ground source heat pumps.
Combination boilers and multipoint water heaters.
Twin, side entry immersion elements
Pumped showers with thermostatic shower mixer
What type of valve can be used on the cold feed of an open vented hot water storage cylinder?
A 22mm - 28 mm stop valve to BS 1010
A 15mm - 22mm isolation / service valve
A 22mm - 28mm gate valve to BS 5154
A 15mm FOV to BS 1212 Part 2
What is a combination open vented hot water cylinder?
A cylinder with twin coils
A cylinder with its own cold feed cistern incorporated as part of the cylinder.
A single feed, indirect self venting cylinder.
A direct cylinder
Where would we be most likely to use a combination cylinder?
In a large 4 bedroom house
In a two bed bungalow
In a flat
In a maisonette
Quick recovery cylinders work at their most efficient when they are installed with.......
Combination boilers
Immersion elements
Standard efficiency heat only open vented boilers
Condensing boilers
The maximum head pressure for a grade 1 cylinder is?
3m
25m
15m
10m
A cylinder measures 300mm x 1050mm. What is its capacity?
103 litres
114 litres
78 litres
74.23 litres
The hot water distribution pipework must be a minimum size of 22mm to any large volume appliances but can reduce to what size to a sink, wash basin and shower valves?
10mm
12mm
8mm
15mm
How does an unvented hot water system differ from an open vented type?
It contains a coil.
It has an immersion element
It is uninsulated.
It has no open safety vent pipe.
