Domestic Hot Water 6035-02 | Part 4

Water that is heated in a combination boiler and then distributes the hot water, it is known as: 

• Instantaneous hot water

• Stored hot water

STATEMENT: A direct cylinder has no need for an immersion heater to back up the primary heat.

• True

• False

What systems are low pressure systems that rely on the head height  of the CWSC to give the system pressure?

• Unvented systems

• Open vented systems

• Closed vented systems

• Half vented systems

One way of bringing the recovery time down in a cylinder is by?

• Increasing the surface area being heated

• Increasing flow from the primary flow pipe

• Reducing the size of the heat exchanger

• Turning the system on earlier if hot water is needed

The galvanic cell scale inhibitor uses a combination of two metals to form an electron flow, copper and ______. What is the missing metal?

• Zinc

• Magnesium

• Iron

• Steel

Which of the following cylinders operates under 'high pressure'?

• Direct cylinder

• Indirect cylinder

• Unvented cylinder

• Chambered cylinder

What is the term for, 'If the mains cold water were shut off in the street for repairs, the cold water in your plumbing system would flow backwards.'?

• Back siphonage

• Back pressure

• Back connection

• None of the above

What must be added in the pipes of a solar thermal system?

• Anti-freeze

• Chlorine

• Wholesome water

• Softened water

Which of the following feeds the 'secondary circuit'?

• F&E

• CWSC

How is water heated in a direct system using an electric immersion heater?

• The immersion heaters heat the heat exchanger coil that directly comes out the draw off point

• The boiler heats the immersion heaters which heats the water

• The immersion heaters heat the water that directly comes out the draw off point

• None of the above