Combi Boiler Installation

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Combi Boiler Installation

We provide combi boiler installations nationwide

If you are looking to install combi boilers, Boilerhut works with some of the best combi boiler brands in the UK.

We have also built a large network of combi boiler installers who supply and install gas oil and LPG combi boilers to postcodes across the UK.

Installation of combi boilers is usually a straightforward affair, but it requires expert installation and a qualified engineer.

All of our engineers are Gas Safe Registered (for Gas and LPG combi boilers), and APHC Registered (for oil boilers).

What are the advantages of a combi boiler?

Space-Saving Design
A key advantage of a combi boiler is its compact design. Since it doesn’t require separate external storage tanks, the entire heating and hot water system is consolidated within one unit. This saves considerable space in your home.

High Efficiency
Combi boilers are renowned for their efficiency. Many modern units come equipped with a flue gas heat recovery system. This system recycles the heat from exhaust gases to warm up water from the mains supply, allowing the boiler to use less fuel while maintaining an efficiency level above 90%. This, in turn, can lead to significant savings on heating bills.

Cost-Effective
Opting for a combi boiler, which integrates all functions into a single appliance, can be more cost-effective than purchasing and installing the multiple components required for traditional systems, such as tanks, cylinders, and pumps.

Instantaneous Hot Water
The ability to provide hot water on demand is another compelling reason to choose a combi boiler. Unlike system and regular boilers that need to heat and store water in advance, combi boilers heat water directly from the mains as it’s needed. This means you can enjoy an endless supply of hot water without the wait.

Is a combi boiler suitable for my house?

The compact size of combi boilers makes them an ideal choice for properties with limited space.

Combi boilers are not just a solution for flats and smaller houses though. Combi boilers come in a variety of outputs making them suitable for properties of a range of sizes.

For instance, modern combi boilers now exist which are equipped to deal with the hot water and heating requirements of homes with 4+ bedrooms, 2+ bathrooms and 20+ radiators. These are called storage combi boilers and house a thermal water storage tank within the unit itself.

Generally, the larger the house and the higher the hot water demands, the higher the kilowatt rating the boiler should be.

More Information About Combi Boilers

Combi Boiler Brands and Reviews

Further Reading…

Combi boilers installation costs

On average a new combi boiler installation will cost you £2,900.

The cost to install combi boilers will vary depending on the boiler that it is replacing and location. A list of the most common combi boiler installations can be found below:

Type of installationAverage costInstallation time
Replacing existing combi boiler, in the same location£2000 – £25001 day
Replacing an existing combi boiler, in a new location£2500 – £30001 to 2 days
Replacing an existing boiler and hot water tank*£2,9002 days
Replacing a back boiler and hot water tank£35002/3 days
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Our Combi Boiler Range

Viessmann-Vitodens-050-W

Viessmann Vitodens 0-50-W Gas Combi Boiler

  • Size: 29kW, 35kW
  • Efficiency: 97%
  • Warranty: 10 Years
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Ariston Clas ONE Gas Combi Boiler

  • Size: 24 kW, 30 kW, 38 kW
  • Efficiency: 90%
  • Warranty: 8 Years
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Worcester Bosch Greenstar 8000 Gas Combi Boiler

  • Size: 30kW, 35kW, 40kW, 45kW, 50 kW
  • Efficiency: 94%
  • Warranty: 12 Years
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Worcester Bosch Greenstar Heatslave II Oil Combi Boiler

  • Size: 18kW, 25kW or 32 kW
  • Efficiency: 94%
  • Warranty: 10 Years
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Navien LCB700 Blue Flame Oil Boiler

  • Size: 21 kW, 28 kW, 36 kW
  • Efficiency: 93%
  • Warranty: 7 Years
Get Your Fixed Price Quote

Viessmann Vitodens 200-W Gas Combi Boiler

  • Size: 30kW, 35kW
  • Efficiency: 98%
  • Warranty: 10 Years
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Frequently asked questions

Combi boilers are a space-saving boiler type that house all of the water heating and central heating components in one compact unit.

Heating directly from the mains, a combi boiler will provide you with an unlimited supply of instant hot water when you turn on a tap or shower. This water is delivered through your pipes at mains pressure where it arrives at your taps and showers.

Combi boilers only heat water when a hot tap or shower is turned on, this ensures maximum efficiency and means that it won’t cost you anything until this is used. To allow for quick delivery of hot water, the length of the pipe run from the boiler to the furthest outlet should be considered.

The central heating portion of a combi boiler is on a pressurised closed loop system, heated by the boiler as required.

If you are short on space or you are looking to better utilise areas of your home, a combi boiler will be ideal because there is no need for a cold water tank in the loft nor a hot water cylinder in the airing cupboard.

Combi boilers deliver hot water through your taps or showers at mains pressure. This means that if your mains water pressure is good enough, you can enjoy hot showers without needing any extra pumps.

As no hot water is stored in an external cylinder and it is delivered as and when required, combi boilers are designed to maximise the amount of energy that is directly used to heat the water. This means there is no need to heat up and store more water than is required, reducing your carbon footprint and cutting down your energy bills.

Combi boilers are straightforward to install, economical to run and are typically installed in a kitchen, utility or airing cupboard. Flueing options should be considered when locating a new boiler (horizontal or vertical).

Whether your combi boiler runs on mains gas, oil or LPG, the fuel enters a sealed combustion chamber inside the boiler and an electric ignition sets it alight.

The primary heat exchanger within the boiler then heats incoming water up to the required temperature, which then flows through all of the radiators in your home or is delivered to taps and showers, as needed.

Combi boilers have two heat exchangers inside them:

  1. A primary heat exchanger (for central heating and hot water)
  2. A secondary plate heat exchanger (for hot water)

The primary heat exchanger heats and recycles the water that goes through the pipes into the radiators.

The secondary plate heat exchanger uses that returning hot water from radiators, and heats up sealed pipes with potable water that goes into your taps.

Our guide will provide more detail about how combi boilers work – How Does a Combi Boiler Work?

If you require hot water from multiple taps at the same time, including showers, then perhaps a regular combi boiler won’t be enough. However, for properties with higher hot water demands, a storage combi boiler will be able to handle the hot water demands from several taps at once.

In the case of the Viessmann Vitodens 111-W, it utilises an integrated stainless steel thermal store with CLS (cylinder loading system). This makes sure that it refills the in-built thermal store within a few seconds without affecting the final flow rate. The Viessmann Vitodens 111-W can handle up to three bathrooms.

However, if you live in a larger house, it may be that a combi boiler isn’t the right option for you and you may want to consider a conventional boiler or a system boiler with an external hot water cylinder instead.

If you are planning to install your new combi boiler in the garage and you have a bathroom on the other side of the house, you could experience a delay in the time it takes for water to heat up and reach your taps and showers. For best results, your combi boiler should either be installed reasonably close to your bathroom, or equidistant to the kitchen taps and bathroom.

Yes. In general, boilers can be installed anywhere in a property. Owners like lofts as they are out of the way and don’t take up kitchen, utility or airing cupboard space. However, it’s worth remembering that if the boiler needs resetting or the pressure drops and needs filling up you may need to get to that combi boiler in the loft. This may not be the easiest thing to do for everyone.

Read more in our boiler in the loft guide >

Yes. But there are considerations; how far is it from bathrooms and taps, is it insulated, etc. Read our post on garage installations here >

Yes. In general, boilers can be installed anywhere in a property. It all depends on the pipework and where the gas supply enters the property. If you have room in your bathroom for a boiler there is no reason you can’t install it in there.

It’s a widespread assumption that gas boilers operate without electricity, relying solely on the gas supply. However, this isn’t the case. Despite gas being the main fuel, gas boilers do require a small amount of electricity to function.

Read our guide on electricity usage >

More Information About Combi Boilers

Combi Boiler Brands and Reviews

Further Reading…

Frequently asked questions

Combi boilers are a space-saving boiler type that house all of the water heating and central heating components in one compact unit.

Heating directly from the mains, a combi boiler will provide you with an unlimited supply of instant hot water when you turn on a tap or shower. This water is delivered through your pipes at mains pressure where it arrives at your taps and showers.

Combi boilers only heat water when a hot tap or shower is turned on, this ensures maximum efficiency and means that it won’t cost you anything until this is used. To allow for quick delivery of hot water, the length of the pipe run from the boiler to the furthest outlet should be considered.

The central heating portion of a combi boiler is on a pressurised closed loop system, heated by the boiler as required.

If you are short on space or you are looking to better utilise areas of your home, a combi boiler will be ideal because there is no need for a cold water tank in the loft nor a hot water cylinder in the airing cupboard.

Combi boilers deliver hot water through your taps or showers at mains pressure. This means that if your mains water pressure is good enough, you can enjoy hot showers without needing any extra pumps.

As no hot water is stored in an external cylinder and it is delivered as and when required, combi boilers are designed to maximise the amount of energy that is directly used to heat the water. This means there is no need to heat up and store more water than is required, reducing your carbon footprint and cutting down your energy bills.

Combi boilers are straightforward to install, economical to run and are typically installed in a kitchen, utility or airing cupboard. Flueing options should be considered when locating a new boiler (horizontal or vertical).

Whether your combi boiler runs on mains gas, oil or LPG, the fuel enters a sealed combustion chamber inside the boiler and an electric ignition sets it alight.

The primary heat exchanger within the boiler then heats incoming water up to the required temperature, which then flows through all of the radiators in your home or is delivered to taps and showers, as needed.

Combi boilers have two heat exchangers inside them:

  1. A primary heat exchanger (for central heating and hot water)
  2. A secondary plate heat exchanger (for hot water)

The primary heat exchanger heats and recycles the water that goes through the pipes into the radiators.

The secondary plate heat exchanger uses that returning hot water from radiators, and heats up sealed pipes with potable water that goes into your taps.

Our guide will provide more detail about how combi boilers work – How Does a Combi Boiler Work?

If you require hot water from multiple taps at the same time, including showers, then perhaps a regular combi boiler won’t be enough. However, for properties with higher hot water demands, a storage combi boiler will be able to handle the hot water demands from several taps at once.

In the case of the Viessmann Vitodens 111-W, it utilises an integrated stainless steel thermal store with CLS (cylinder loading system). This makes sure that it refills the in-built thermal store within a few seconds without affecting the final flow rate. The Viessmann Vitodens 111-W can handle up to three bathrooms.

However, if you live in a larger house, it may be that a combi boiler isn’t the right option for you and you may want to consider a conventional boiler or a system boiler with an external hot water cylinder instead.

If you are planning to install your new combi boiler in the garage and you have a bathroom on the other side of the house, you could experience a delay in the time it takes for water to heat up and reach your taps and showers. For best results, your combi boiler should either be installed reasonably close to your bathroom, or equidistant to the kitchen taps and bathroom.

Yes. In general, boilers can be installed anywhere in a property. Owners like lofts as they are out of the way and don’t take up kitchen, utility or airing cupboard space. However, it’s worth remembering that if the boiler needs resetting or the pressure drops and needs filling up you may need to get to that combi boiler in the loft. This may not be the easiest thing to do for everyone.

Read more in our boiler in the loft guide >

Yes. But there are considerations; how far is it from bathrooms and taps, is it insulated, etc. Read our post on garage installations here >

Yes. In general, boilers can be installed anywhere in a property. It all depends on the pipework and where the gas supply enters the property. If you have room in your bathroom for a boiler there is no reason you can’t install it in there.

It’s a widespread assumption that gas boilers operate without electricity, relying solely on the gas supply. However, this isn’t the case. Despite gas being the main fuel, gas boilers do require a small amount of electricity to function.

Read our guide on electricity usage >

More Information About Combi Boilers

Combi Boiler Brands and Reviews

Further Reading…

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