Are Boiler Hot Water Storage Tanks a Necessity?

Hot water storage tanks have been a popular feature in many households for years. They allow for a ready supply of hot water and can be especially useful in households or buildings with high hot water demand.

However, some people have questioned whether these tanks are truly a convenience, particularly with the rise of combi boilers.

What is a hot water storage tank

To start with, let's look at what a hot water storage tank is and how it works. 

Hot water storage tanks are typically used in systems where the water is heated by a boiler or other heat source, then stored in the tank until it is needed. 

This allows for a consistent supply of hot water and can be especially useful in households or buildings with high hot water demand.

Advantages of hot water storage tanks

One of the advantages of hot water storage tanks is that they can provide a more consistent supply of hot water than other systems. 

Because the water is preheated and stored in the tank, there is less of a delay when hot water is needed. This can be particularly important in larger households or buildings where multiple people may need hot water at the same time.

Disadvantages of hot water storage tanks

However, there are also some disadvantages to hot water storage tanks. One of the biggest is that they can be inefficient. 

Because the water is constantly being heated and stored, energy can be wasted if the tank is not properly insulated or if the temperature is set too high. 

Additionally, if the tank is too small or if the demand for hot water is particularly high, the tank may run out of hot water, which can be inconvenient.

Despite these disadvantages, hot water storage tanks are still a popular choice for many households and buildings. They can be particularly useful in areas with unreliable water supplies or in areas where there is high hot water demand. Additionally, many newer hot water storage tanks are designed to be more efficient and can help reduce energy costs.

What is a combi boiler?

A combi (combination) boiler is a type of domestic boiler that ‘combines’ a home’s central heating and hot water production into one succinct unit.

A combi takes water directly from the mains and heats it upon usage. After detecting a hot water request, the combi begins to burn gas in a combustion chamber. 

The hot gases rise and move through a series of pipes and into a component called a heat exchanger, the hot gas running through the exchanger then heats the surrounding cold water.

In a conventional boiler system, this process is done according to a programme and the water is stored in a separate cylinder until it’s needed. 

A combi only starts this cycle upon request (initiating the heating or turning on a hot water outlet), therefore the hot water is almost instant.

Advantages of a combi boiler

Compact Size

Combi boilers are popular due to their compact size and the ability to perform the functions of two appliances.

They save storage space as they are designed to be compact, fitting seamlessly into a standard kitchen cupboard and blending in with the decor.

Direct Water Supply

Combi boilers draw water directly from the mains, providing high flow pressure that guarantees a rapid and uninterrupted supply of hot water. 

Unlike conventional boilers that rely on gravity to collect water, combi boilers do not pool or heat water slowly.

Remote Control

Homeowners can remotely control combi boilers using technology such as smart thermostats or smartphone apps, offering convenience and peace of mind.

Safe to Drink

The hot water produced by combi boilers is safe to drink as it has not been stored in a tank for long periods, reducing the likelihood of contamination.

Cost-Effective

Combi boilers are cost-effective and energy-efficient to run as they primarily use gas, which is relatively inexpensive.

Quiet Operation

Modern combi boilers are designed to operate quietly, making them quieter than traditional boilers.

Versatile

Combi boilers are versatile as they can run on various fuels and have abundant replacement part availability, ensuring quick and affordable repairs when needed.

That being said, combi boilers also have some disadvantages. Because they heat water on demand, there can be a delay in hot water delivery if multiple people are using hot water at the same time. 

Additionally, combi boilers can struggle to provide hot water at high pressure, which can be a problem for some households or buildings.

Despite these disadvantages, combi boilers are becoming increasingly popular, particularly in smaller households or buildings with lower hot water demand. 

iHeat

In conclusion, both hot water storage tanks and combi boilers have their advantages and disadvantages. 

Hot water storage tanks can provide a consistent supply of hot water but can be inefficient and take up space. Combi boilers, on the other hand, are efficient and save space but can struggle to provide hot water at high pressure. 

The choice ultimately depends on the specific needs and circumstances of the household or building.

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