Central Heating Installation Cost: New Boiler and Radiators Explained
A full central heating installation is one of the bigger jobs you will have done on a house. It might mean heating a home that has never had it, replacing a tired old system completely, or putting in a new boiler and radiators at the same time. This guide explains what shapes the price so you know what you are paying for.
Gas Safe registered 25 years in the trade 12 years running the business
Written by Chris Gill, C Gill & Son Plumbing & Heating ·
Three very different jobs
People use 'central heating installation' to mean different things, and the cost follows the scope. A new boiler on existing pipes and radiators is the smallest of the three. A new boiler with all new radiators on the existing pipework is a step up. A complete system, with new pipework, radiators, boiler and controls throughout, is the largest, especially in a house that has never had a wet heating system.
Being clear about which of these you need is the first step to a useful quote.
Size and layout of the home
The number of rooms decides how many radiators are needed, and the shape of the house decides how far the pipes must travel. A compact terrace with rooms stacked above each other is simpler to pipe than a long bungalow or a house with an extension at the back. Every extra radiator adds materials and labour.
Pipe routes and floors
Running new pipework is where much of the labour goes. Timber floors can be lifted and relaid, so pipes run neatly between joists. Solid concrete floors downstairs are harder: pipes may need to drop from the ceiling above, run along skirting, or be chased into walls.
How much disruption you are happy with affects the route too. Surface pipework is quicker but more visible; hidden runs take longer to install and make good.
Choosing and sizing the boiler
The boiler has to match the home's heat demand and its hot water use. A combi suits many smaller homes; a system or regular boiler with a cylinder suits homes with more bathrooms. Our guide to combi vs system boilers explains the difference, and our new boiler cost guide covers the boiler side of the price in more detail.
Radiators: number, size and style
Each radiator is sized for the room it heats, taking account of windows, outside walls and insulation. Standard panel radiators are the most economical. Column, vertical and designer radiators cost more and can need different fixing. Towel rails in bathrooms and kitchens are another choice. If you are only replacing radiators rather than installing a whole system, our radiator replacement cost guide is more relevant.
Controls
A new system is the right time to fit good controls: a programmable or smart thermostat, thermostatic radiator valves in most rooms and, on larger homes, separate heating zones. These are a modest part of the overall cost but make a real difference to comfort and running costs.
Hot water
If the new system includes a hot water cylinder, its size, type and position all affect the price. An unvented cylinder needs a discharge pipe routed to a safe point. Replacing an old tank-fed system with a combi removes the tanks but may mean upgrading the gas supply or the incoming water pipe.
Gas supply and flue
A new boiler needs a gas pipe large enough to supply it at full output. In older homes, the existing pipe from the meter is sometimes too small and has to be upgraded. The flue position also matters, as it must meet clearance rules from windows, doors and boundaries.
Making good
Lifting floors, drilling through walls and moving furniture are all part of the job. Agree up front who puts floorboards back, who fills holes and who decorates afterwards. A quote that covers this clearly avoids surprises.
Comparing like with like
When comparing quotes, check each one lists:
The boiler type and output
The number and sizes of radiators
Pipe routes and any floor or wall work
Controls included
Cylinder or hot water arrangements
System cleaning, inhibitor and a filter
Removal of old equipment
Need it sorted? Book a central heating survey
For a real figure, Chris needs to see the house. The survey and quote are free. Our central heating page explains how a new system is planned, and our boiler installation page covers the boiler side. Call or WhatsApp 07429 632804, or use the quote form.
Covering Neath, Port Talbot, Swansea and the surrounding area.
Common questions
Central heating cost FAQs
Clear answers before you arrange a visit.
How much is a new boiler and radiators?+
It depends on the boiler type and output, how many radiators the house needs, whether the existing pipework can be reused and how much floor and wall work is involved. A free survey gives you a fixed figure for your home.
Is it cheaper to keep the existing pipework?+
Usually, if the pipes are in good condition and correctly sized. Old or undersized pipework, or a system full of sludge, may need replacing for a new system to work well.
How long does a full central heating installation take?+
It depends on the size of the house and the pipe routes. Chris will confirm how long your installation will take when he quotes.
Do I need new radiators with a new boiler?+
Not always. Radiators in good condition and sized correctly can often stay. The system should still be cleaned when a new boiler goes in.
What adds most to the cost?+
New pipework through solid floors, a large number of radiators, designer radiators, gas supply upgrades and moving the boiler to a new position are among the biggest factors.
