Combi Boiler Basics: What You Need to Know

A combination boiler, commonly referred to as a “combi boiler,” offers both space heating and domestic hot water in one compact unit. This boiler type can be a great option for small homes and apartments, where space for a separate water heater and furnace might not be available. In addition, combi boilers can be a good choice for homes with multiple bathrooms, as they can provide enough hot water for multiple uses at once. 

There are two types of combi boiler, those with a storage tank and those without. Storage combi boilers have a hot water cylinder where water is heated and stored until it is needed. Non-storage combi boilers heat water on demand.

How Does a Combi Boiler Work?

Water is heated by a gas or oil-fired boiler and then stored in a hot water cylinder. A cold water feed enters the cylinder and is heated by the boiler as it passes through a heat exchanger. The hot water is then delivered to the taps or radiators as required.

When a tap is turned on, cold water enters the boiler and is heated before passing through the heat exchanger and being delivered to the tap. The boiler will continue to fire to maintain the water at the required temperature.

How to Install a Combi Boiler?

If you are having combi boiler problems, then you may need to install a new one. Here is a step-by-step guide on how to install a combi boiler.

1. First, you will need to disconnect the power to your boiler and gas supply. You will also need to close the water supply to your boiler.

2. Next, you will need to remove the old boiler. This can be done by disconnecting the flue pipe and the gas supply. You will also need to remove any pipes that are connected to the old boiler.

3. Once the old boiler is removed, you will need to install the new boiler. First, you will need to connect the gas supply to the new boiler. Next, you will need to connect the flue pipe. Finally, you will need to connect the water supply to the new boiler.

4. Once the new boiler is installed, you will need to turn on the power and gas supply. You will also need to open the water supply. Your new boiler should now be operational.

How to Clean a Combi Boiler?

If you have a combi boiler in your home, then you know that it is a great way to have both hot water and heat on demand. However, like any other appliance, your boiler will need to be cleaned on a regular basis to prevent it from developing problems. While you can always hire a professional to clean your boiler, you can also do it yourself if you have the time and the right supplies.

The first thing that you need to do is to turn off the power to the boiler. You can do this by flipping the switch on the breaker box. Once the power is off, you will need to open up the boiler so that you can access the inside. Be sure to wear gloves and a dust mask to protect yourself from the boiler’s components.

Next, you will need to use a soft brush to dust off the inside of the boiler. Be sure to reach all of the nooks and crannies so that you can remove all of the dirt and grime. Once you have dusted the inside of the boiler, you can use a vacuum to suck up any remaining dirt.

After vacuuming the boiler’s inside, you will need to clean the outside. You can do this by using a garden hose to spray down the outside of the boiler. Be sure to get all of the dirt and grime off of the outside so that it does not build up and cause problems.

Once you have cleaned the outside of the boiler, you will need to make a solution of one part water and one part vinegar. This solution will help to break down any mineral deposits that may have built up on the inside of the boiler.

After making the vinegar solution, you will need to pour it into the boiler and let it sit for about an hour. After the hour has passed, you can flush the boiler out with clean water. Be sure to do this several times so that all of the vinegar is removed from the boiler.

Now that you have cleaned the inside and outside of the boiler, you will need to put the cover back on. Be sure to screw the cover on tightly so that no dirt or debris can get inside.

After you have replaced the cover, you can turn the power back on to the boiler. You should now have a clean and functioning boiler. Be sure to check it regularly so that you can catch any problems before they cause major damage.

Advantages of Using a Combi Boiler

Combi boilers are highly efficient and can save you money on your energy bills as they only heat the water you need when you need it. They are also very space efficient as they do not require a separate hot water cylinder or cold water storage tank, making them perfect for small homes.

There are many other benefits of combi boilers, including:

  • Combi boilers are very efficient
  • Doesn’t require a large space
  • Low maintenance
  • Faster and quick operation
  • Compact size
  • They have a long lifespan
  • Combi boilers are often cheaper to install than other boiler types.
  • They are very versatile and can be used with a variety of heating systems
  • They are suitable for a wide range of property types

Disadvantages of a Combi Boiler

If you’re considering a combi boiler for your home, there are a few things you should know. While combi boilers are very energy efficient and can save you money in the long run, there are some drawbacks you should be aware of.

1. Limited hot water – One of the biggest combi boiler cons is that it can’t produce an endless supply of hot water. If you have a large family or live in a house with multiple bathrooms, you may find yourself taking cold showers from time to time.

2. Installation can be tricky – Combi boilers must be installed by a qualified professional. This means that installation can be costly and time-consuming.

3. Not suitable for all homes – Combi boilers are not suitable for all homes. If your home has more than one bathroom or you have a large family, a combi boiler may not be the best option for you.

4. Can be noisy – Combi boilers can be quite noisy, especially when they’re first turned on in the morning. If you have a small home or live in an apartment, this may not be the best option for you.

No water tank-  This boiler does not have a tank for storing hot water. If the boiler breaks down you will be without hot water and heat.

Final Thought

If you’re considering a combi boiler for your home, it’s important to weigh the pros and cons carefully. While combi boilers can offer some advantages, they might not be the best choice for every home. Be sure to consult with a heating and cooling professional to determine if a combi boiler is right for you.