September 3, 2021

What Are Combi Boilers?

Combination boilers, or combi boilers, have become the most popular option for residential heating in the UK. As the name implies, combi boilers deliver heating and hot water from the mains simultaneously.

Ignoring your current boiler is simple. As a general rule, they endure for a long time and you only have to worry about them when anything goes wrong with them. As a result, many houses in the United Kingdom have an older boiler that only serves one function. As a result, combi boilers have rapidly become one of the most popular kinds of boilers in the United Kingdom when it comes to replacing outdated boilers.

Exactly why are combi boilers so popular, what makes them unique, and why should you consider upgrading to a combi boiler when it’s time to replace your current boiler? If you’re a first-time combi boiler buyer or just replacing your existing combi boiler, we’ll walk you through all you need to know about combi boilers at Elite Group.


How does a combi boiler work?

Due to its dual purpose, combi boilers are sometimes known as “combination boilers.” A water heater boiler and a central heating boiler are combined in one box to create this device. You don’t have to boil a tank of water to get hot water when you need it. Due to the lack of a separate hot water tank, they are both energy efficient and space efficient.

Knowing how a combi boiler works can help you make the most of your investment. This is because there is no tank, thus a combi boiler gets all of its liquid from the mains water line. Your combi boiler kicks in and warms up a stainless steel heat exchanger when you switch on the hot water tap. As a result, you’ll get fresh water at any temperature you need in a matter of minutes. While some combination boilers do come equipped with a reserve tank, they are usually not particularly spacious. As for your heating, whether it’s your own specific settings or a heating system that utilises a room thermostat to activate, the water is heated according to your instructions.


Vaillant Combi Boilers


Where does a combi boiler vary from a standard boiler?

Three kinds of boilers exist: ordinary, system and combination boilers, to be precise. You can check out our guide to all boiler types for more information. Combi and conventional or system boilers vary in two important ways. Primarily, it’s about the water supply. However, conventional boilers have a huge feed and cold-water expansion tank, which is usually located in the attic. One of the benefits of getting your water straight from the mains is that you’ll usually get considerably greater water pressure when using the mains.

As for the other distinction, it’s a hot water storage tank that’s required. Your combi boiler will heat water on demand, while normal boilers need a hot water tank or cylinder. So that you can have hot water when you need it, you need a storage cylinder for hot water. If your combi boiler does not include a hot water storage tank, you will never run out of hot water.


Various types of Combi Boilers

In addition to gas combi boilers, there are a variety of other kinds available. Electric, oil, and LPG combi boilers are also available. Is it difficult to decide what to buy? For further information, please contact us.


Combi Boilers with Gas

By far, the most popular kind is a gas combi boiler. Every other kind is deployed less often than this one. A direct gas connection ensures that your monthly gas payments and maintenance expenses are kept to a minimum.

Combining water and gas lines makes this a great option, which is why it’s so popular across the United States and the world over. Gas is used in a gas combi boiler to heat the water.


Combination electric boilers

The other kinds of combi boilers use fuel to heat the water, while an electric combi boiler doesn’t need fuel to heat the water. In the same way as a hot water tank, it warms an electric element using grid-supplied energy. Afterwards, water flows over the element to heat it.

Electric combi boilers are useful in circumstances where gas or oil are either impracticable or too costly to utilise as a source of heat or power. Another benefit is that you don’t have to use fossil fuels to power the generator. Gas and oil are cheaper, but electric power may be more costly. The quantity of water that can be heated at one time is likewise restricted.


Combi Boilers with Oil

To heat the water, these boilers need fuel, much like a gas boiler. Since they have a number of more limiting issues, they’re less popular than certain other kinds of combi boilers. Your access to a certain source of energy is restricted while you’re burning a fuel. In this case, you aren’t just drawing power from the grid.

Having your own oil tank is required in order to operate an oil combi boiler. There is a requirement to store this outside of your house for safety reasons, and you’ll need to buy oil from a source to keep it full.


LPG Combination Boilers

Finally, we have the last of the gas-fired combi boilers. Liquid petroleum gas (LPG) is used in combination boilers (LPG). Oil refining produces a mixture of gaseous hydrocarbons.

An LPG tank will be required on your premises, just as you would for an oil combi. You will need to maintain the tank full.


Combi boilers provide a number of benefits

As a popular option, combi boilers provide a variety of benefits over traditional boilers and system boilers. Among them are:

  • As well since providing immediate heating and hot water, combi boilers are extremely energy-efficient, as they only generate heat when it is necessary.
  • You’ll also save money on your heating costs by only producing heat when it’s required. You save energy by just generating hot water when it’s required, so you’re not wasting it on heating water and then keeping it warm.
  • As a result of the lack of a tank in the roof space, less plumbing is required, resulting in an easier and faster installation of a combination boiler. Those tanks don’t have to be maintained, either.
  • The small design of the boiler makes it suitable for households with limited space. Especially with the small choices available, the device will easily fit into a normal sized kitchen cabinet. You won’t have to worry about installing a big water tank or hot water cylinder, which will free up precious loft space.
  • An array of fuel choices – If you rely on an off-the-grid fuel supply, you may choose an oil or LPG combi boiler.
  • You may be certain that the efficiency rating of your combi boiler will be optimum no matter what size it is. Both ErP and SEDBUK expect the new combination boilers to perform well. Heat and hot water products may be more efficient if they are rated by ErP and SEDBUK. In addition, the ratings make it simple to compare boilers from different manufacturers including Worcester, Vaillant, and Ideal.

Combi boilers have a few drawbacks

Even though we’re huge fans of combi boilers, they aren’t always the best option for your house. You should be aware of the following drawbacks of combi boilers:

  • If your house has low water pressure, a combi boiler is unlikely to work effectively. Because of this, a lot of older properties may have trouble surviving.
  • As long as the hot water demand is low, combi boilers perform effectively. Because of the increased demand, combination boilers are not recommended for houses with more than one bathroom.
  • Households with low expectations of production should not utilise this product — Homes with multi-jet showers should also avoid using a combi boiler owing to the high demand for hot water that combi boilers cannot provide. One would be better for those who have several bathrooms or power showers with pumps. When it comes to hot water pressure, you won’t be able to operate two faucets simultaneously.
  • Combi boilers are not suited for power showers. In order to work, they need a built-in pump that links to the hot water cylinder.
  • As a result of these problems, combi boilers are not a good option for big homes. Using a combi boiler is difficult if there are too many persons or locations that require hot water at the same time. Ideal for tiny apartments.


Why you should choose a combi-boiler

You should examine a few factors before purchasing a combi boiler. Among them are:

  • Your home’s size
  • a boiler requires a certain amount of room
  • Your home’s water pressure and what it means for your boiler pressure
  • Sources of fuel accessible to you

In terms of heat production and flow rate, combi boilers come in a wide variety of sizes to suit any home. A property’s number of bedrooms and bathrooms will determine which boiler is best for it. Prior to the installation, a gas safety registered engineer will determine this.

You should familiarise yourself with the various kinds of boilers available before choosing between a conventional boiler and a combi boiler if you’re in the market for a new system. Before you decide to replace your boiler, you may want to check for common boiler issues and learn how to repair them before making a decision. Perhaps you don’t even need to replace your current boiler.