What Is a System Boiler?


Discover the Perfect Heating Solution for Your Home: Introducing System Boilers

Get an instant quote and be fitted immediately! There are countless different types of boilers available, which may make finding the right one difficult. If you are hiring a reliable engineer, you will have efficient heating systems that provide both hot water, and central heating at a cost that will meet the needs of your home. Many homes are choosing system boilers as an alternative, and we’ve put together this checklist. Let me discuss the advantages and disadvantages associated with system boilers.

What is a system boiler suitable for? System boilers explained.

System boilers can serve any residence, but this does not necessarily make them the ideal regular boiler for your property.

Imagine you want to heat your home and have hot water available whenever you need it. A system boiler is a type of boiler that helps you do just that. It’s called a “system” boiler because it works together with a heating system to provide both heating and hot water.

The system boiler is connected to the heating system pipes and also to the hot water pipes that distribute hot water throughout your home. It has a built-in pump that helps circulate the hot water, so it can reach all the different rooms and taps. The system boiler heats the radiators and the hot water cylinder at the same time.

One advantage of a system boiler is that it can provide hot water to multiple outlets at the same time, so you can use the shower while someone else is washing dishes.

How does the system boiler work? -How does a system boiler heat your home?

A system boiler efficiently distributes hot water to radiators as well as the hot water storage tank or cylinder, which is a water storage cylinder normally housed in the airing closet or attic. This means you can use numerous taps at the same time without trouble, allowing you to do things like washing up while someone else takes a shower.

Is a system boiler the same as a regular boiler?

A system boiler operates similarly to a standard boiler system, but since it is not connected to the mains, it is not the same as a combination boiler. With the help of a separate hot water tank, a system boiler home’s central heating system and provides a steady supply of hot water for everyone in the house.

Does a System Boiler Need to Be On for Hot Water?

No, a system boiler does not require continuous operation to provide hot water. System boilers are made to store heated and stored hot water in cylinders or tanks for later use. The boiler can be switched off after the water in the cylinder reaches the required temperature and is left off until all of the hot water is used up. As a result, you can use hot water even when the boiler is not heating anything. It’s crucial to keep in mind that the boiler will need to be restarted to heat additional water if the hot water in the cylinder runs out.

The normal temperature for your cylinder is above 65 degrees. This is the minimum temperature setting to stop the legionella bacterium from growing in the cylinder.

What are the Advantages of a System Boiler?

A system boiler, which functions in more than one bathroom, like a larger combi boiler, can be an excellent choice among all ordinary boilers. A system boiler can be a wonderful option if you want to stick with standard boilers and stay away from complicated boiler installations with features that you will never use.

Their size is a drawback because it necessitates a sizable hot water storage tank. It could take some time for the system boiler to heat this tank if it is empty as a result of heavy water demand over an extended period of time. They become popular among those who own considerably larger homes or properties with more space, as a result. Using this boiler together with an unvented cylinder you can have high pressure on the outlets. This cylinder is connected to the main water which is high pressure.

System Boilers’ Advantages Over Combi Boilers

The need for hot water in your home ultimately determines whether a system boiler or a combi boiler is best for you.

There is no better option than a new combi boiler, for smaller homes with just one bathroom. Instant hot water will be available to you from a highly effective boiler which should enable you to reduce your energy costs.

If your demand for hot water is higher, we would go for a system boiler which can supply more than 5 bathrooms.

System Boilers’ Advantages Over Heat Only Boilers

As opposed to heat-only boilers, system boilers have a number of benefits. They take less time and money to install. System boilers allow for the simultaneous use of many taps or showers because they have an integrated hot water storage tank that provides a ready and steady supply of hot water at mains pressure. Additionally, the system boilers occupy less space, so they are appropriate for smaller homes. System boilers may also be more energy-efficient when used with contemporary heating controls, which could result in utility bill savings. These boilers provide convenience, benefits for saving space, improved hot water performance, and greater energy efficiency overall.

When Would a Different Type of Boiler Be Better?

Heat-only boilers, also known as regular boilers, are a better choice if your property already has a traditional heating system with separate cold storage and hot water storage tanks. Retrofitting your old system with a system boiler could involve significant modifications, making a heat-only boiler a more practical option.

Combi boilers, on the other hand, provide heating and hot water on demand without the need for a separate hot water storage tank. They are ideal for smaller properties or households with lower hot water demands. If you don’t require simultaneous use to heat the water out of multiple taps or showers, a combi boiler could be a better fit.

How much do system boilers cost?

The cost of a system boiler in the UK can vary depending on various factors such as the brand, model, capacity, and additional features. On average, a system boiler can range in price from around £1200 to £2,500 or more.

Please keep in mind that the prices provided are estimates and may vary due to market conditions, ongoing supply factors, and individual suppliers.

Note: This does not include the additional materials such as flue, system protection, smart thermostat and the installation cost. The installation cost includes the gas engineer’s time and knowledge, gas tests, and gas safe&warranty registrations.

Installation costs

Aside from the boiler installation prices it should be noted the installation price of the system boilers. Depending on the situation the installer of new system boilers work costs from £1000 up to £2500 on average in London. According to the complexity of installing a new system boiler takes 1 to 3 days. The simplest type of boiler installation is an identical replacement, in the same size system boiler in place.

Transform Your Heating Experience: Harness the Power of System Boilers

Attention North London residents! Need a boiler installer you can trust? Look no further! MML Plumbing Ltd is your go-to choice for top-notch boiler installation. As a local, Gas Safe registered company, we’ve got the skills and 15 years of expertise to get the job done right.

Whether you are looking to get a system boiler, hot water cylinder, a boiler unit a combi boiler, heat only boiler new central heating to be installed, we are your best choice.

Contact us at 02083550840 or 07521441850, email info@mmlplumbing.com, or get a quick quote online.

Don’t settle for less when it comes to your boiler – choose MML Plumbing Ltd today!

When it comes to system boilers, MML Plumbing Ltd is the expert you can rely on for a flawless installation. There is no doubt that your system boiler, installed perfectly by our team, will provide you with reliable heating and hot water day after day. Trust MML Plumbing Ltd for all your gas system boilers and boiler installation needs!

People also ask

What are the disadvantages of a system boiler?

Disadvantages of a system boiler: System boilers have a few potential disadvantages, such as the need for storage space for the hot water cylinder or tank. Additionally, if the hot water cylinder runs out of hot water, there may be a delay in receiving hot water until it heats up again. Depending on the size of the tank this can take up to 3 hours.

Is a system boiler better than a combi?

System boiler vs. combi: Whether a system boiler or a combi boiler is better depends on your specific needs. System boilers are generally more suitable for larger properties or homes with multiple bathrooms, as they can provide hot water to multiple taps simultaneously. Combi boilers, on the other hand, are more compact and efficient, making them a better choice for smaller properties or homes with lower hot water demands.

When would you use a system boiler?

A system boiler is typically used in properties with higher hot water demands or multiple bathrooms. It is ideal when simultaneous use of multiple taps or showers is required without a significant drop in water pressure or temperature. System boilers are also preferred when there is space available for a hot water cylinder or tank.

Do you need a cold water tank with a system boiler?

Need for a cold water tank: With a system boiler, you typically do not need a separate cold water storage tank, as the system is pressurized. The cold water supply comes directly from the mains and is heated by the boiler before being distributed to taps and radiators.

What Pressure Should My Boiler Be?

Ideal boiler pressure: The pressure in a boiler should typically be between 1 and 1.2 bar when the system is cold. However, it’s important to consult the manufacturer’s instructions or a qualified heating engineer for the specific pressure requirements of your boiler model.

What Do I Do If My Boiler Has No Pressure?

Low boiler pressure: If your boiler has low or no pressure, there are a few steps you can take. First, check if there are any visible leaks in the system. You can also try repressurizing the boiler using the filling loop or consult the boiler manual for specific instructions. (GAS ENGINEERS ONLY) If the issue persists, it’s best to contact a heating engineer for further assessment and repair.

No Hot Water – What to Check

No hot water: If you have no hot water, there are a few things to check. First, ensure that the boiler is powered on and functioning correctly. Verify that the thermostat or timer settings are appropriate. If the issue persists, it could be related to the hot water cylinder, diverter valve, or other components. It’s recommended to contact a heating/ gas engineer to diagnose and resolve the problem.

What is a storage cylinder?

This is a cylinder that is supplied with cold water from a cold-water tank stored in the loft, also often called a feeder tank. This means water is fed into the cylinder with the help of gravity via a vented pipe which is then heated in the loft tanks the same way and fed to the water outlets via the pipework.


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