How Much Does a New Boiler Cost in 2026?98
From compact combis to full system installs — what drives the price of a new boiler, what a fair quote looks like, and where you can safely save.
Sarah Mitchell
Energy Efficiency AdvisorKey takeaways
Reading time — 6 min
Expert reviewed — Practical guidance from our heating team
Replacing a boiler is one of the biggest home-maintenance decisions you will make, and quotes can vary enormously. This guide breaks down what actually drives the cost, so you can read any quote line by line.
What actually drives the price
- Boiler type and output — a higher-output model for a larger home costs more.
- System changes such as moving the boiler or converting to a combi.
- Flue and condensate routing — simple horizontal flues are quickest.
- System health — a flush and magnetic filter protect the new boiler.
- Controls — smart thermostats add cost upfront but lower bills.
How to read a quote like a professional
A trustworthy quote itemises the boiler model, flue parts, system cleanse, filter, controls and labour separately. Be cautious of a single-line “supply and fit” figure — it makes comparison impossible and often hides shortcuts.
Where you can safely save
A mid-range boiler from an established brand rarely sacrifices reliability, and keeping the boiler in its current location avoids the most expensive part of many jobs. Where you should never save: the flush, the filter and the installer’s Gas Safe qualifications.