Direct/Indirect

What is the primary difference between an indirect and a direct hot water cylinder?

• Indirect cylinders are always larger than direct cylinders.

• Indirect cylinders use a coil to transfer heat from a separate heating system, while direct cylinders use immersion heaters within the tank.

• Direct cylinders are only used for commercial purposes, while indirect cylinders are for residential use.

• Indirect cylinders can only heat water with solar panels, whereas direct cylinders use electricity.

How does an indirect hot water cylinder primarily heat the water for household use?

• Hot water from a boiler circulates through a coil inside the cylinder, transferring heat to the water in the tank without mixing.

• Immersion heaters directly heat the water inside the cylinder.

• The cylinder is heated by direct flame from a gas burner underneath it.

• Solar panels are the sole source of heat for the water in the cylinder.

What is the typical temperature range of the water coming from the boiler into the coil of an indirect hot water cylinder?

• 30-40 degrees Celsius

• 50-60 degrees Celsius

• 75-80 degrees Celsius

• 90-100 degrees Celsius

What is the main heating mechanism for a direct hot water cylinder?

• A heat exchanger connected to a central heating system.

• A gas burner located at the bottom of the tank.

• A coil through which hot water from a boiler circulates.

• One or more immersion heaters submerged directly in the water.

What is the purpose of the top immersion heater in a direct hot water cylinder, especially on Economy 7/10 systems?

• To provide a quick boost of hot water when the main heating element is off or the tank is not fully heated.

• To heat the entire tank during off-peak electricity hours.

• To circulate water through the central heating system.

• To regulate the water pressure within the cylinder.