Is an unvented cylinder direct or indirect?

As mentioned above, the unvented system draws water from the mains. It then heats the water in one of two ways, depending on whether it is direct or indirect. An indirectly heated system (which is the most common) gets heat from an external source, often in the form of a gas boiler or solar panels.

How does a indirect cylinder work?

The way an indirect cylinder works is that an external source is used to heat the water prior to being transferred to the indirect cylinder. A central heating boiler may be used for this purpose, or another external heating source such as solar panels, for example. Cold water is drawn into the tank from a water source.

How does an indirect unvented cylinder work?

An indirectly heated system (which is the most common) gets heat from an external source, often in the form of a gas boiler or solar panels. The hot water then travels through a copper coil in the hot water cylinder, heating the surrounding water without actually mixing with it.

What makes a hot water cylinder a direct cylinder?

A direct hot water cylinder does not possess a heating coil that would be found an indirect cylinder and is instead heated by an immersion heater which can be either side or top entry. The immersion heater heats the water contained inside the cylinder directly and it is for this reason it is known to be a direct cylinder.

What happens when you replace a hot water cylinder?

Replacing your hot water cylinder can mean a saving of up to 25% on you annual hot water fuel expenses. New hot water cylinders now come highly insulated meaning your stored hot water will stay hotter for longer, meaning a reduction in your fuel bills.

When to use an Unvented hot water cylinder?

Unvented hot water cylinders are used on pressurised plumbing systems, where the system pressure far exceeds that of a gravity system. They are manufactured from high grade stainless steel and are capable of withstanding very high pressures. A pressurised system is basically a water system that has a pressure pump installed.

How does an open vent hot water cylinder work?

An open vent cylinder will have an open ended pipe that is routed form the hot water take off on the cylinder to above the cold water storage tank, this pipe acts as a vent pipe but more importantly maintains the low water pressure within the cylinder.

What’s the difference between direct and indirect hot water cylinders?

It usually goes through a two port or a three port valve, which is gonna direct hot water through a coil inside that hot water cylinder. Now, that is the main thing that differentiates it from a direct cylinder.

Where are indirect fired hot water heaters located?

Indirect fired water heater tanks for domestic hot water, such as the SuperStor TM are usually located close to the heating boiler and will have both cold and hot water lines leaving the tank to supply the building with domestic hot water and a loop of piping that runs between the [usually the] bottom of the tank and a nearby heating boiler.

What is the circulator on an indirect water heater?

The circulator is used to circulate hot water to and from the indirect fired water heater but the control at above left is an aquastat and is not the control that maintains hot water in the separate indirect hot water tank.

Do you have a direct or indirect hot water tank?

The indirect tank next to me here has usually an immersion heater in the top or the bottom, or if it’s an Economy one or if they’ve got some sort of photovoltaic solar panel system set up, they might have two. You might have a top one and a bottom one, but for the indirect hot water cylinders, that doesn’t matter.