Woman regulating the temperature of a hot water cylinder

Most households depend on hot water cylinders to provide heated water in their homes. They are essential elements that warm your home’s needs unless you are a cold-shower kind of household. As important as these components are, many people do not understand how they work and establish an issue when it arises. The issues that arise with these cylinders are best dealt with when you select an appropriate cylinder for your home.

While picking the right cylinder for your home is your best option, the market is overwhelmed with a wide range of heating cylinders. This can make your buying decision difficult. That is why you need to know more about them to make the right decision when buying. Read on to find out more about what a hot water cylinder entails to enable you to pick the right one for your home.

Types of Hot water Cylinders

These are tanks that are used to heat and store water to use later. There are mainly two types of hot water cylinders, including pressurized unvented and vented hot water cylinders.

Unvented Cylinders

Unvented type gets its water straight from the mains and takes advantage of great levels of pressure to supply water easily all through the home. There is no need for a separate cold water tank when you have an unvented hot water cylinder. As a result, this type is more compact compared to its bulky counterparts.

Vented Cylinders

Vented hot water cylinders, on the other hand, get water externally from a header tank that is stored in higher places of a home, like an attic. The system is found in raised places because it utilizes gravity to accumulate pressure. A vent pipe connects the water tank to the cold water tank, which is why the name ‘vented.’

What are Hot Water Cylinders Good for?

Hot water cylinder connection

If you are in a large household setup, then the demand for hot water is greater. Having a hot water cylinder enables the provision of heated water throughout the house through various channels simultaneously. Water stored in boiler systems using these cylinders, however, can be distributed when the need arises.

Another advantage of these cylinders is that they are versatile; they can use either electricity, biomass fuels, or solar power to heat water.

Choosing the Right Water Heating Cylinder


The first thing to look for when choosing a hot water cylinder is to check that it runs with utmost efficiency. This is only possible when you consider the size of the cylinder you are getting. The right size can meet the demands of the hot water system.


A bigger size will be wasting a lot of energy, and it will heat more water than the requirement. This will, in turn, waste energy. Then again, a smaller tank diminishes the water as quickly as it heats, making it unreliable for a frequently used system. Therefore, when picking the right size, you need to keep in mind the daily demand placed on the water system, especially during peak moments.


While considering that the demand is important, you should also pay attention to the pressure required by the system at peak time. Also, the hot water cylinder capacity and the time it takes to re-heat the water matters a lot regarding the pressure required.

Vented vs. Unvented hot water cylinders

Vented cylinders have a minimalist design that is easy to maintain and also install. Since the unvented type doesn’t need a water tank, it saves on a lot of space, providing more flexibility during installation. Unvented, on the other hand, deliver much stronger water pressure. You will still access heated water when the mains supply is cut off with vented cylinders.

Hot water cylinders are favorites of many people around the world. Not only do they save on heating time and energy, but also they are versatile and dependable. Depending on your needs, you can either choose vented or unvented hot water cylinders.