New boiler costs
Navien NCB300 28kw - gas boiler replacement popular on BOXT - from £1,650
We're working with BOXT to install all our new gas boilers. Who have over 22,000+ 5-star reviews for gas installation and heating service on Trustpilot(2) . You and your new gas boiler are in trusted hands.
- Prices include new boiler installation, parts, labour and VAT
- Monthly payment options, including 0% deposit available
- Up to 10-year warranty
- Delivery and installation as soon as the next day (subject to availability and location)
- Boiler installation includes wireless room thermostat, flue, filter and everything else you need
- £50 off every new gas boiler.
Replacement boiler - we'll beat like-for-like price
If you find the same fixed price boiler installation somewhere else, BOXT will beat the like-for-like price by £50 or give you an Amazon voucher if they can't.
Boiler replacement that gives you more
Lower energy bills
New boilers tend to be more efficient than old ones, so you won't spend any more money than you need to on heating.
Reduce your carbon footprint
A new A-rated boiler helps the environment by bringing down your home's carbon emissions.
New boilers are generally smaller and quieter than the ones they replace. You'll also have the option of moving your boiler somewhere out of the way.
Better water pressure
Depending on the type of boiler you choose, it can improve your hot water pressure considerably, making a hot shower much more enjoyable.
Unlimited hot water
In flats and small houses where space is at a premium, installing a combi boiler means a hot water tank isn't required. In addition, they only heat up the water you need to use making them very efficient.
Modern boilers and radiators
If you're not moving your boiler, new ones are often more modern and attractive. You can also add new radiators to your installation to replace the old ones.
Why replace your boiler with BOXT?
Get a fixed price
Every Gas Safe installation includes a free system cleanse, recycling of your old boiler, pipework alterations and upgrades, a new thermostat and magnetic filter.
Up to 10 year
If something goes wrong, it’s good to know that you’re covered and that you can get an engineer out to fix the problem as soon as possible, without leaving you out of pocket.
Gas Safe approved
Every engineer is a Gas Safe registered installer, with plenty of experience fitting boilers. They'll keep the house nice and tidy while they work too.
What do BOXT customers say?
What happens when BOXT replace your combi boiler with a new one?
Find out what happens on new boiler installation day with a straight forward combi boiler swap.
Combi boilers are both a high-efficiency water heater and central heating boiler in one single unit, which can improve hot water pressure and mean there's no need for a hot water tank.
You can find out more about boiler replacement and what happens during new boiler installation in our handy guide.
Things to consider when replacing your boiler
Guide to new boiler replacement costs
A new boiler can be expensive, especially when unplanned. We explain what you should consider when getting a boiler that can impact the cost.
UK gas boiler ban 2025
Find out everything you need to know about the boiler ban being introduced in 2025 and what other heating options are available to replace your gas boiler.