System Boiler Installation

System boiler installation

At Boilerhut, we offer system boiler installation all across the UK.

System boilers are an ideal boiler solution for homes with high hot water demands. Also known as sealed system boilers, system boilers sit in the middle between combi boilers and conventional boilers because they require an unvented hot water cylinder but don’t need an exterior pump and a header tank.

At Boilerhut, we supply and install a comprehensive range of highly efficient system boilers suitable for all kinds of properties. Our experienced installation team is here to assist you should you require a system boiler.

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What is a system boiler?

A system boiler works on a closed heating system, and only requires a boiler and an unvented hot water cylinder for storing hot water. Like conventional boilers, system boilers heat your central heating system by producing hot water for a storage cylinder. However, unlike conventional boilers but similarly to combi boilers, system boilers don’t require an exterior pump and a header tank, as all of the heating and hot water components are built into the boiler unit.

Is a system boiler right for my home?

This type of boiler is ideally suited for larger homes with a higher number of radiators and multiple bathrooms.

As system boilers require a separate cylinder for storing hot water, it is important that you consider whether your home has enough space to accommodate this type of boiler. It is these space considerations that prevent many homes from being able to accommodate the cylinder used with a system boiler. However, if you have an airing cupboard or spare cupboard space to hide the cylinder away, a system boiler will be suitable for installation at your property. 

You might consider a system boiler as opposed to a combi boiler because you require hot water from more than one outlet at a time and you require higher levels of hot water than a combi boiler can provide. Typically, combi boilers will only supply hot water to one shower or tap at a time. System boilers on the other hand can accommodate multiple showers and taps calling for hot water at the same time, this makes them ideal for homes with multiple bathrooms.

You might consider a system boiler as opposed to a conventional boiler system for a number of reasons. These include a lack of space in the loft for the header tanks which feed the hot water cylinder and maintain the water level in the radiators. Other reasons for considering a system boiler rather than a conventional boiler could be due to your home suffering from low water pressure or because it has older radiators that aren’t suitable for the high pressures system boilers provide.

boiler prices

How much does a system boiler cost?

The average cost of having a system boiler installed in 2021 is £2500.

This cost is based on a like-for-like boiler replacement, retaining the existing unvented hot water tank and the boiler being installed by a reputable Gas Safe Registered heating company. This installation would also include the following services:

  • Old boiler decommissioning and removal 
  • Chemical flushing the heating system
  • New boiler installation
  • Installation of any accessories including the system filter 
  • Commissioning of the new system

However, it should be noted that no two boiler installations are the same and the cost of installing a boiler can depend on many factors, including whether it is a like for like replacement, a boiler relocation, or a system upgrade involving an upgrade of the gas pipework.

How much can I save with a new system boiler?

According to the Energy Saving Trust, you could save up to £315 annually by replacing your old inefficient boiler in your detached house with an A-rated condensing system builder with a programmer, room thermostat and thermostatic radiator controls (TRVs)*.

*Figures based on fuel prices as of May 2021
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System boiler manufacturers 

System boilers are available in the UK from manufacturers including Viessmann, Ariston, Navien, Worcester Bosch, Vaillant and Baxi.

Regardless of the manufacturer, the system boilers available to purchase in 2021 are far more efficient than those that were available to purchase a few years ago. The efficiency of these can be further increased when combined with smart thermostat technology.

System boiler manufacturers

System boiler advantages

  • Hot water supply is near-constant – this gets stored in the hot water cylinder and you’ll have hot water ready for whenever you need it until this runs out
  • Multiple taps and showers can be used at the same time – the hot water supply can be used straight away over several taps. As it’s coming from the hot water cylinder, there won’t be a drop in temperature between taps and showers
  • No need for a cold water storage tank – this frees up space, allowing more options for expansion/conversion of your property
  • Ideal for properties with more than one bathroom – as the hot water is stored in the hot water cylinder, it’s ready to be supplied across multiple bathrooms. This can make life a lot easier for families in the morning that need to use more than one bathroom

System boiler disadvantages

  • Space for installation – the hot water cylinder takes up a great deal of space and will usually fill an airing cupboard or similar storage area
  • Hot water cylinder size – this determines how much hot water you have stored ready to be used. Like other types of boiler with a hot water cylinder, if it’s empty, you’ll have to wait for the boiler to heat up more before it’s ready

 Gas system boilers

Gas system boilers are suitable if you live in a property that has more than one bathroom or require more hot water than can be provided by a combi boiler and your property is connected to the mains gas supply.

Below are some of the most popular gas system boilers currently available in the UK:

Viessmann Vitodens 100-W System Boiler

Viessmann Vitodens 200-W System Boiler

Viessmann Vitodens 200-W

Worcester Bosch Greenstar 8000 Life System Boiler

Worcester Bosch Greenstar 8000 Life Boiler

Oil system boilers

Like gas system boilers, oil system boilers are designed for use in larger properties with multiple bathrooms and higher hot water demands. However, oil system boilers are specifically developed for properties amongst the four million in the UK which aren’t connected to the mains gas grid.

Heating oil for the oil system boilers is stored in an external tank within the property boundary.

All of our oil system boilers generally are floor mounted and there are options for these to be relocated outside, if possible.

Below are some of the most popular oil system boilers currently available in the UK:

Navien LCB700 Blue Flame Oil System Boiler

Navien LCB700

Worcester Bosch Danesmoor Oil System Boiler

LPG system boilers

LPG system boilers are another alternative for properties not connected to the mains gas grid. Like oil system boilers, the LPG fuel for the boiler is stored in a tank to the exterior of the property.

Below are some of the most popular LPG system boilers currently available in the UK:

Worcester Bosch Greenstar i System LPG Boiler

Worcester Bosch Greenstar i

Viessmann Vitodens 100-W System Boiler

Viessmann Vitodens 200-W System Boiler

Viessmann Vitodens 200-W

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