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How long does a new boiler install take?
Most like-for-like combi swaps take us 2 days. Changing the type of system, or moving the boiler, takes longer. Here's what happens, and how to get ready.
- 2days for most combi swaps
- 2 to 3days for a system boiler swap
- Everyinstall includes a system clean and a magnetic filter
Greenstar 4000
Two days might sound long for swapping a boiler. Most of that time goes into cleaning the system the new boiler runs on, so it lasts.
We'll give you a time estimate with your quote, and talk you through each day before we start.
A standard swap: usually 2 days
Old combi out, new combi in, in the same place.
- Remove and take away the old boiler
- Fit the new boiler and adjust the pipework
- Clean the system with a power flush
- Fit a magnetic filter to protect the new boiler
- Fit new controls
- Test, commission and register the guarantee
A system boiler with a hot water cylinder usually takes 2 to 3 days, including the flush.
Day one and two
What takes longer
Changing the type of system, or where the boiler goes.
Changing system
For example, taking out a hot water cylinder and tanks to fit a combi. That means removing them from the loft or cupboard, new pipework and sometimes a bigger gas pipe.
Moving the boiler
For example, from the kitchen to a cupboard. That can mean a new flue hole, longer pipework and making good the wall.
We'll tell you how long your job will take when we quote.
System changes
During the job, and getting ready
What to expect, and what helps.
You'll be without heating and hot water while the old boiler is out. We'll go through the plan for each day before we start.
How to get ready
- Clear the area around the boiler, and around any tanks or cylinder
- Keep pets and valuables out of the way
- Make sure someone over 18 is home at the end for the handover
The handover
Which one sounds like you?
- Combi to combiAbout 2 days
In the same place.
- Hot water cylinder2 to 3 days
Combi or system?
- Not sure what sizeOur size guide
What size combi you need.
- Ready for a priceGet a quote
A guide price in minutes.
Common questions
Can a boiler be fitted in one day?
Some can, but we spend longer so the system gets a proper clean before the new boiler goes on. That protects the boiler and its guarantee.
Will I have heating overnight?
On a 2 day job there's usually a night without heating and hot water. We'll go through the plan with you before we start.
Do you take the old boiler away?
Yes. We remove the old boiler and take away all the packaging.
Does every install include a power flush?
Every boiler we install includes a system clean and a magnetic filter.
What controls do you fit?
Usually Worcester Bosch's own controls or Hive, chosen to suit your boiler and how you use your heating.
How do I get a price?
Our online quote gives you a guide price in a couple of minutes, and a survey confirms it.
Related pages
Not sure what you need? Give us a shout.
Book online in a couple of minutes or give the office a call, Mon to Fri, 9am to 5pm. We'll tell you what we think, and if the answer is to leave things as they are, we'll say that too.
Worcester Bosch Accredited Installer
Guarantees of up to 12 years on the boilers we fit. Gas Safe registered. Fife Trusted Trader. 400+ customer reviews.