System Boilers Pros and Cons – How Does It Works?


Table of Contents

What is a System Boiler?

The central heating and hot water in our homes come from system boilers and hot water tanks. The boiler uses mains water to heat the boilers and boils water in the tank for use in sinks, showers, and other places.

System boilers heat our homes by boiling water with gas or oil. They work well in bigger homes with lots of bathrooms and boilers that need a lot of hot water on a frequent basis.

There may be a more cost-effective way to heat your home and water if you have four or more people living there.

How Does a System Boiler Work?

Look at how system boilers heat our homes and give us hot water. The flame in a gas-powered boiler heats water in a tight hot water system. After warming up in the tank, hot water is pumped around radiators to spread the heat located at different parts of your home. 

An electric heat exchanger warms water in an electric boiler, which works like a gas boiler. The water in the system is always being used by the boilers and hot water tank coil.

Does a System Boiler Need to Be On Always?

The systems for the hot water and radiators aren’t kept on 24/7. It uses timers and boilers to turn on and off automatically. It will stop heating water if there is no need for it or if boilers are not being used. A valve turns off the water to the other one if only one is needed. This saves energy.

A lot of people set their system boilers to warm the water in the tank in the morning. A tank of hot water can be used by residents to take baths, showers, and do their laundry when they wake up. You’ll have to wait for more hot water because the cylinder has to start heating again after being used.

Water flow from the mains is used by many system boilers to heat water from the tap. The bottom of the tank gets cold water and the top gets hot water. It will go cold if you use hot water faster than it can be heated back up (by running a bath or two). You will have to wait to use it again until it is warm again.

Advantages of System Boilers

System boilers are better than combi boilers and heat-only boilers in some ways. Let’s look at them separately.

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System Boilers Pros and Cons

Unlike system boilers, combi boilers don’t have a hot water tank. Instead, they use heated water to heat water and run boilers. It’s possible that a system boiler is better for your home than a combi boiler, even if the shower and tap heat up quickly.

  1. A system boiler lets a lot of people use hot water in the washbasin, bath and shower without the flow or temperature dropping.
  2. Electric immersion boilers can be used in the tank to heat the water. You can use these to get cheap power at night or energy from the sun. They could be used as a backup while the boiler is being fixed or broken down.
  3. You can add a bigger tank to a system boiler if your hot water needs grow. But combi boilers can only heat a certain amount of water at a time.


System Boilers Are Better Than Heat-Only Boilers

The heat-only boiler also uses a tank to keep hot water, just like the system boiler. There are other names for this boiler, i.e. regular boiler. The main change is that a cold water tank is added to feed the hot water, dump any extra hot water, and lower the pressure.

It is gravity-fed and doesn’t need any pressure. This cold water tank is normally in the loft. Most of the time, a cold water tank sits on top of the boiler levels.

A regular or heat-only boiler might not be the best choice for your home because:

  • There are no loft tanks in system boilers, so they are smaller. That’s great if you don’t have much storage space or if you’ve turned your loft into a room.
  • Setting up a new central heating system with a system boiler is cheaper than with a heat-only boiler because the latter requires more tank installation and pipe work.

When Would a Different Boiler be Better?

You might not need hot water from two taps if you live alone or in a small house. This is when a combi boiler should work.

And if you only take one shower a day, you could use less hot water. Again, a combination boiler should be enough since it might not be worth it to heat a hot water tank.

Main pressure is used by enclosed system boilers. Because they don’t have much pressure, heat-only boilers heat water by letting it fall. Low water flow can make it impossible to set up a device.

This will save you money because most homes made before 1970 have heat-only boilers. Just replace the boiler and leave the other parts alone.

How Much Does a System Boiler Cost?

A system boiler can range in price from £600 to £1800, based on the brand, type, and size.

An entry-level boiler is good for middle-class homes that need more energy than one or two-bedroom homes. The most expensive types cost around £1500 and are best for large homes that need a lot of heat.

What Makes System Boiler Top Favourite?

There are many reasons to install a Worcester Bosch system boiler, but these are the ones that most customers think about:

  1. Great for a Lot of People and a Lot of Bathrooms
  2. Several taps can get hot water at the same time.
  3. Not expensive to run; 
  4. Simple to set up
  5. There are no loft tanks, which saves room for conversion.
  6. Solar water boilers can use this product.

Things To Consider Before Installing System Boilers

Installing System Boilers

1. Size and Number of Rooms, Bathroom and Hot Water Need

Think about what might stop you from getting a new boiler, just like you would with any other purchase. What’s important is.

The best place to put your hot water tank could be in a trunk with a lot of room or a closet that you don’t use very often that is hidden away. It’s best to hide something that big, so if you don’t have enough space, think about getting a different boiler system. A system boiler doesn’t need a header tank, so it’s great for homes that don’t have a loft or a loft converter.

2. Efficiency & How Well It Functions

Boilers work well these days. Never forget that system boilers lose heat from the water tank. This won’t happen if you properly protect your tank to keep heat inside.

System boilers make it easier to keep track of how much water is used in the home because they quickly heat water for showers and faucets. Once the tank is empty, you have to wait for it to warm up before you can use more hot water. You can figure out if a system boiler is right for you by keeping track of how much water you use.

Need a new boiler?

Upgrade to an A-rated boiler at no cost with the Berks insulation.
As a UK landlord, enhance your property’s value and save on energy costs.

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What are Other Benefits of Installing A System Boiler?

System boilers have many benefits that make sure you are completely satisfied.

1. Simple to Install

Systems work faster and easier than regular boilers. The system may be smaller and need less loft room because many of the parts that heat and heat water are built in.

2. Hot Water Availability All the Time

The water tank in your system boiler will help you get hot water quickly. Having more than one faucet or shower does not lower the water flow. This is helpful for bigger families and homes with more than one bathroom.

3. Saving Money

A system boiler responds quickly and costs less to run than others, even though the heat tank would lose heat if it wasn’t properly sealed. Check out the different types of water tank insulation to make the system work better.

4. A Lot of Water Flows

Since system boilers are connected to the main water line, the water flow in taps and showers is better. As was already said, you won’t notice a change if more than one faucet or shower is being used at the same time.

Frequently Asked Questions

  1. Excellent for homes with lots of bathrooms being used at the same time.
  2. Since your hot water tank is now warm, you can quickly turn on as many faucets as you want.
  3. Compatible with solar-heated water systems

System boilers feature an internal expansion vessel, whereas heat-only boilers have a feed and expansion tank to maintain water pressure. System boilers do not need tanks to store cold water, therefore they need less piping and site space than open vent boilers.

System boilers’ main shortcomings are: Even without a tank, a system boiler requires a large hot water cylinder and a boiler unit, making it unsuitable for a small residence.

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