Instantaneous hot water systems

Multiple Choice

What is the significance of instantaneous hot water systems in modern plumbing?

• They provide immediate hot water at the point of use, increasing convenience and efficiency.

• They are only used in industrial settings.

• They are outdated and rarely installed today.

• They are primarily used for cold water supply.

Multiple Choice

Which type of localised water heater is typically used to supply small quantities of hot water to hand-wash basins and showers?

• Localised storage water heater

• Multi-point instantaneous water heater

• Localised instantaneous water heater

• Combination boiler

Multiple Select

Which of the following components are found in a localised storage water heater?

• Heater element

• Thermostat

• Insulation

• Pressure differential valve

Fill in the Blank

The heater works on Bernoulli's principle by using a ___ tube to create a pressure differential across the gas valve when cold water is flowing into the heater.

Open Ended

Describe how the pressure differential in a multi-point instantaneous water heater leads to the ignition of the gas burner.

Multiple Choice

What is the primary function of the diverter valve in a combination boiler?

• To control water temperature

• To divert boiler water around a second heat exchanger

• To ignite the burner

• To regulate gas flow

Multiple Choice

Which component in a thermal store system is responsible for mixing hot and cold water to achieve a desired temperature?

• Expansion chamber

• Adjustable thermostatic mixing valve

• Heat exchanger

• Central heating pump

Open Ended

Explain how thermal stores differ from domestic hot water cylinders in terms of their heat source and operation.

Multiple Select

Select all features that are true for gas- or oil-fired combined primary storage units.

• They require a separate boiler for heating.

• They use a gas burner as their heat source.

• Cold water is passed through a heat exchanger.

• They have an adjustable thermostatic mixing valve.

Open Ended

Compare and contrast open-flued and room-sealed appliances in terms of where they take air for combustion and where they discharge combustion products.

Fill in the Blank

A flueless appliance should never be used for more than ___ minutes continuously.

Open Ended

After learning about instantaneous hot water systems, what questions do you still have or what would you like to know more about regarding these systems?

Multiple Choice

Which of the following is NOT a type of instantaneous hot water system mentioned in the lesson?

• Localised systems

• Gas- or oil-fired combination boilers

• Thermal stores

• Solar water heaters