Hot Water - PPT 4 - Instantaneous hot water heaters

What are localised systems often called?

• Central systems

• Single-point or point-of-use systems

• Distributed systems

• Multi-point systems

Which of the following is a category of localised systems?

• Central heating systems

• Thermal stores

• Instantaneous type heaters

• Gas-fired boilers

What do gas- or oil-fired combination boilers have in addition to operating like localised instantaneous hot water heaters?

• A cooling capability

• A central heating capability

• A storage capability

• A solar heating capability

What is the primary use of localised instantaneous water heaters?

• To heat large quantities of water for industrial use

• To supply small quantities of hot water to hand-wash basins and showers

• To cool water for refrigeration purposes

• To store hot water for long periods

What happens when the control valve (tap) of a localised instantaneous water heater is closed?

• The water flow increases

• The heat source continues to operate

• The water flow stops and the heat source shuts down

• The heater stores the hot water

What is the typical minimum water pressure required for localised instantaneous water heaters?

• 0.5 bar

• 1 bar

• 2 bar

• 3 bar

Where are over sink heaters typically fitted?

• Under a sink

• Over an appliance

• Inside a wall

• On the floor

What is the main difference between under sink heaters and over sink heaters?

• Under sink heaters require a special tap or mixer tap.

• Over sink heaters have a larger capacity.

• Under sink heaters are more energy efficient.

• Over sink heaters are easier to install.

What is the typical capacity of under sink heaters?

• Up to 15 litres

• Up to 10 litres

• Up to 20 litres

• Up to 25 litres

What principle does the multi-point instantaneous water heater use to create a pressure differential?

• Newton's law

• Bernoulli's principle

• Archimedes' principle

• Pascal's law