Combi boiler
replacement
Old combi on its last legs? Get a fixed price for a new combi boiler online in under two minutes, fitted by Gas Safe registered engineers across Doncaster, Sheffield, Barnsley and Rotherham.
- Best for
- Homes with one bathroom and good mains pressure
- Time to fit
- Usually one day, typically 4–8 hours
- Fitted price
- £1,745–£2,595 for a like-for-like swap, by boiler and size
- Included
- Boiler, flue, fittings, Gas Safe certificate and commissioning
New combi boiler,
usually in a day
Combi boiler replacement is the most common job we do. If your new combi goes in the same place as the old one, it’s normally a single-day job, typically 4 to 8 hours from switching off to handing over.
Your fixed price includes the new boiler, labour, flue, fittings, a full system commission and your Gas Safe certificate, so the price on the day is the price you were quoted. Before we leave, we walk you through the new boiler and controls.
A new combi heats water on demand from the mains, so there’s no hot water tank to wait for. It suits most homes with one bathroom and decent mains water pressure.
Get your fixed price online in a couple of minutes →
- Gas Safe registered engineers
- Fixed price, no hidden extras
- Same-week installation slots
- Pay with Klarna at checkout
Same place, simpler job
Keeping the new combi where the old one was keeps the job quick and the cost down. Moving it adds pipework and time.
Hard water areas
Where water hardness is above 200ppm, Building Regulations guidance says a combi’s hot water should be protected against limescale. Doncaster’s water is hard.
Smarter controls
A new boiler is a good time to upgrade your controls. You can add extras such as a Hive smart thermostat when you get your quote.
Bigger homes
With two or more bathrooms in use at once, a system boiler with a cylinder may suit you better. See combi vs system boiler.
Combi boilers
we install
Tap a boiler to see its specification. All come with long manufacturer warranties.
Combi boiler replacement
FAQs
How long does a combi boiler replacement take?
Most like-for-like combi swaps are finished in a single day, typically in 4 to 8 hours. Moving the boiler or changing the flue route takes longer.
Do I need a new flue with a new combi?
Usually, yes. A new boiler is normally fitted with the flue supplied for it, and the cost is included in our fixed price.
Will I need new radiators?
Not usually. Your engineer checks the system when fitting the new boiler and will tell you up front if anything else needs attention.
How much does a combi boiler replacement cost?
It depends on the boiler and your home. See our new boiler cost guide, or get your exact fixed price online.
Combi boiler replacement near you: Doncaster · Sheffield · Barnsley · Rotherham.
Don’t just take
our word for it
“Had this company fit my new boiler and i cannot recommend them enough. Excellent service from start to finish. Turned up on time , and were very clean and tidy throughout the instalation , Also they are lovely polite lads. I would definatley use this company again.”
“Wanted to say thank you to Morgan for his hard work today he came to my house and was very polite and got straight on with the job. Left the house very tidy after he finished his work and I was very happy with the job. Would definitely recommend for the future customers 👍”
“Highly recommend! Very professional and polite after the job was done he left the work area very tidy.”
Get your combi boiler
replacement price
Answer a few quick questions, add your postcode and see your fixed price straight away. No call needed and no obligation.