A combi boiler installation is one of the most common home heating investments in the UK. Understanding what's included in a quote — and what drives the cost — helps you make a confident, informed decision.
A complete combi boiler installation should include: the boiler unit, all installation labour, a new flue and fittings, removal and responsible disposal of the old boiler, system flush (where needed), commissioning, and testing to manufacturer's specification. Any quote that doesn't include these items should be questioned.
A like-for-like combi boiler swap (same type, same location) is the most straightforward and affordable option. Converting from a regular or system boiler to a combi involves extra work — removing the cylinder and cold tank, adjusting pipework — and costs correspondingly more. We'll give you a clear breakdown of what's included in your quote.
From your first message to a working boiler — here's what to expect.
Answer a few short questions. Takes about two minutes. You can add photos of your boiler or any error codes showing.
We connect you with a Gas Safe registered installer in your area who can visit quickly and assess the job.
Your installer gives you a clear written price before anything starts. No surprises and no obligation to proceed.
Answers to the questions we hear most often.
Answer a few questions and we'll connect you with a Gas Safe installer in your area.
Gas Safe registered installers · Fixed-price quotes · No obligation