1. Pt 1 Types of Domestic Central Heating Systems

What is the main purpose of central heating?

• To provide thermal comfort within a property

• To ventilate the property

• To heat water for domestic use

• To cool down the rooms during summer

What does full central heating allow?

• Heating selected rooms to different temperatures

• Heating the exterior of the property

• Heating all rooms in a property to a specific temperature set by the customer

• Heating only the living room to a specific temperature

What is selective central heating?

• A system that heats the entire property to the highest possible temperature

• A system that allows heating of only the bathrooms

• A system that allows for some rooms to be heated to a specific temperature selected by the customer

• A system that heats the property using solar energy only

What characterizes background central heating?

• A system that uses natural gas only

• Heating based mainly on cost, with a smaller boiler or heat emitters

• Heating to the highest temperature regardless of cost

• A system that can heat the property to any temperature regardless of the outside temperature

What happens if a system cannot achieve the customer’s desired comfort temperature when the outside temperature is -10C?

• It is upgraded automatically to a sealed, pressurised system

• It is classed as background heating

• It is considered a full central heating system

• The system shuts down to prevent damage

What are the two categories of modern domestic central heating systems based on?

• The color and design of the boilers

• The way the system is filled with water and the pressure that the system operates at

• The type of fuel used

• The size of the property

What is a characteristic of sealed, pressurised systems?

• They are fed from a feed and expansion cistern located at high level

• They are no longer installed in new properties

• They are fed directly from the mains cold water and incorporate an expansion vessel

• They use convection currents to circulate the water

What is a limitation of systems using single feed or primatic hot water cylinders?

• They can heat the property to any temperature efficiently

• No inhibitor can be added to this type of heating system

• They require constant manual intervention to operate

• They are the most modern system available