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
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:
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:
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: