New Boiler Cost 2026: UK Prices & Installation Costs
Boilers
Mo Alwadi
, Gas Safe Registered Engineer
Updated:
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If you are researching a new boiler cost, the price you see online is only a starting point. The final amount depends on the boiler type, the existing heating system, the proposed boiler position, the flue, pipework, controls, hot-water demand and any work needed to remove or alter the old installation.
A straightforward combi-for-combi replacement in the same suitable position is normally less involved than moving the boiler, changing from a regular or system boiler to a combi, or replacing a back boiler.
The best way to compare prices is to look at the full installation scope rather than the headline figure alone. You can compare new boiler options or request a new boiler quote based on your home.
Important: Any gas boiler installation must be carried out by a suitably qualified Gas Safe registered engineer. Package prices and availability must be confirmed for the property before work is agreed.
How much does a new boiler cost?
Let’s Heat currently displays fully fitted starting packages from £1,799 for an Essential Combi replacement. The Smart Combi package starts from £2,350, while the System Boiler Upgrade starts from £2,999.
These are advertised starting prices for the listed packages, not guaranteed prices for every property. Your final quotation may change if the installation requires boiler relocation, additional flue components, gas-pipe alterations, system changes, extra controls, cylinder work, specialist access or other materials and labour.
For wider UK context, national cost figures can vary depending on the boiler specification, installation scope and source date. A national average should therefore be treated as a budgeting guide, not as a quotation for your home.
Quick answer: what changes the price of a new boiler?
The main factors are:
•the existing boiler type;
•the replacement boiler type;
•whether the boiler stays in the same position;
•the number of bathrooms and expected hot-water demand;
•the required boiler output;
•the flue route;
•gas, heating and hot-water pipework;
•condensate drainage;
•heating-system condition;
•controls and smart thermostats;
•cylinder and loft-tank work; and
•access, removal and making-good requirements.
A higher boiler output is not automatically better. The replacement should be selected around the property’s heating requirement and hot-water demand.
Let’s Heat new boiler package prices
Package | Advertised starting price | May suit | Listed inclusions |
Essential Combi | From £1,799 fully fitted | A straightforward like-for-like combi replacement | New combi boiler, standard flue, magnetic system filter, chemical system flush, corrosion inhibitor, boiler controls, removal of the old boiler and first annual boiler service |
Smart Combi | From £2,350 fully fitted | A homeowner who wants smart heating controls | Everything in the Essential package, plus a smart thermostat, smartphone app control, heating schedules and controls set up and explained |
System Boiler Upgrade | From £2,999 fully fitted | A home with higher hot-water demand or stored hot water | New system boiler, smart controls, magnetic filter, chemical system flush, inhibitor, heating-system commissioning, warranty registration and first annual boiler service |
A package may not be suitable for every property. The existing heating system, hot-water arrangement, gas supply, flue, pipework and proposed boiler position should be assessed before the final price is confirmed.
What is included in a new boiler installation?
The exact scope depends on the package and property, but a quotation may cover:
•the specified boiler model and output;
•standard flue components;
•heating controls;
•a magnetic system filter;
•chemical system cleaning and corrosion inhibitor;
•removal and disposal of the old boiler;
•commissioning and handover;
•warranty registration; and
•a first annual boiler service where this is included in the selected package.
Do not assume that every quotation includes relocation, major pipework alterations, cylinder replacement, extensive system cleaning, building work, decorating or all possible flue components. These items should be stated clearly in writing.
What changes the cost of a new boiler?
Existing boiler type
Replacing a combi with another suitable combi in the same position is often simpler than changing the entire heating arrangement. Replacing a regular or system boiler may involve a cylinder, tanks, controls and additional pipework.
A back boiler replacement is usually more involved because the old appliance is located behind a fireplace and the new boiler normally needs a different position. Read our back boiler replacement guide for the main considerations.
Boiler position
Keeping the boiler in the same suitable position can reduce the amount of new pipework, flue work and making good. Moving it can still be worthwhile if the current location is inconvenient, inaccessible or unsuitable for the planned system.
Hot-water demand
The number of bathrooms and the way hot water is used can affect the most suitable boiler type. A smaller property with one bathroom may be well suited to a combi boiler. A larger household using several outlets at the same time may benefit from stored hot water through a system boiler and cylinder.
Boiler output
The boiler should be sized around the property’s heat loss and hot-water requirements. Choosing the largest available output can lead to unnecessary cost and may not provide the best operating result.
Flue route
A short flue through a suitable external wall is normally simpler than a longer, vertical or more complex route. The proposed terminal position and manufacturer’s installation requirements must be checked.
Gas supply
The existing gas supply should be assessed for the proposed appliance. Alterations or upgrades may be required depending on the boiler model, pipe length and installation arrangement.
Condensate drainage
Modern condensing boilers need a suitable condensate discharge route. A difficult or distant route can add materials and labour, especially when the boiler is being moved.
Heating-system condition
Sludge, leaks, poor circulation, damaged valves, corrosion or unsuitable radiators may need attention before the new boiler is commissioned. A full power flush is not automatically required for every installation; the system condition should be assessed first.
Controls
Standard controls, smart thermostats, programmers and zoning arrangements can change the installation specification and price. Make sure the quotation identifies the controls included.
Typical new boiler installation extras
Two quotations can have very different totals because one installer has included more of the installation than the other. The figures below are general UK budgeting guides, not fixed Let’s Heat charges. Some items may already be included in a selected Let’s Heat package.
Item | General budgeting guide | What to check |
Magnetic system filter | About £110–£310 supplied and fitted | The current listed Let’s Heat packages include a magnetic filter; confirm the live package details |
Wi-Fi or smart controller | About £150 supply only as a general guide | Check whether the selected package includes the thermostat, app and setup |
Power flush | Often around £350–£800 as a general guide | The requirement depends on system condition, property size and radiator count |
Standard TRVs | About £8–£40 each for materials | Fitting costs depend on the number of valves and the work already being carried out |
Always check what is included before adding an extra to your budget. Do not present these general figures as fixed Let’s Heat prices.
If the system has heavy sludge, poor circulation or persistent cold spots, read the guide to power flush costs.
Is it cheaper to keep the boiler in the same place?
Usually, keeping the boiler in the same suitable position reduces the amount of work required. The installer may be able to reuse more of the gas, heating and water pipework and keep the flue and condensate route simpler.
However, the existing position should not be kept automatically. Moving the boiler may improve access, free kitchen or cupboard space, support a renovation or provide a better arrangement for the new system.
The best choice is a comparison between:
•the cost and practical benefits of keeping the existing position; and
•the additional cost and benefits of moving the boiler during replacement.
Does changing boiler type cost more?
Usually, yes. Replacing the same type of boiler in a suitable position is often more straightforward than changing the heating-system arrangement.
Combi-to-combi replacement
A combi-to-combi replacement can be relatively simple when the existing position, gas supply, flue, condensate, controls and heating system are suitable. The final price still depends on the property and the selected model.
System boiler replacement
A system boiler works with stored hot water, so the cylinder, valves, controls and available space need to be considered. If the existing cylinder is old or unsuitable, replacing it may form part of the wider project.
Regular or heat-only boiler replacement
A regular boiler normally works with a cylinder and feed-and-expansion tanks. Keeping the existing arrangement may be sensible when the cylinder, tanks, pump, valves and pipework remain suitable.
Regular or system boiler to combi
Changing to a combi may involve removing or isolating a cylinder and tanks and altering the existing pipework. The incoming mains flow and household hot-water demand should be assessed before choosing this option.
Back boiler replacement
Replacing a back boiler is usually a larger project because the old appliance is behind a fireplace and a suitable new boiler location must be found. Read the back boiler replacement guide before requesting a quotation.
How do I know which boiler I need?
Start with the property and the way your household uses heating and hot water rather than choosing a boiler by brand or kW number alone.
The assessment should consider:
•property heat loss;
•insulation and glazing;
•radiator output;
•number of bathrooms;
•simultaneous hot-water use;
•mains water flow and pressure;
•existing cylinder and tanks;
•available boiler locations;
•flue and condensate routes; and
•controls and future servicing access.
A small property with one bathroom may suit a combi boiler. A larger household may be better served by stored hot water. The right choice cannot be confirmed from bedroom count alone.
Read the guide to choosing the right boiler for your home or compare different types of boiler systems.
What should a new boiler quote include?
Before comparing two prices, check that both quotations cover the same work. A good quote should identify:
•exact boiler make, model, type and output;
•proposed boiler position;
•flue and additional flue components;
•heating controls;
•magnetic filter;
•system cleaning and corrosion inhibitor;
•changes to gas, heating or hot-water pipework;
•condensate drainage;
•removal and disposal of the old boiler;
•commissioning and handover;
•manufacturer warranty registration;
•Building Regulations notification or certification where applicable;
•VAT treatment;
•exclusions and provisional work; and
•any expected work involving cylinders, tanks, radiators, valves or making good.
A cheaper headline price is not necessarily better value if essential parts of the installation have been excluded. Compare the scope line by line.
Should you repair the old boiler instead?
Sometimes a repair is more sensible than replacement. The decision should consider the boiler’s condition, reliability, repair history, availability of parts, safety and the cost of the proposed repair.
A repair may be reasonable when the fault is limited and the boiler is otherwise in good condition. Replacement may be worth comparing when breakdowns are frequent, parts are difficult to source, the system no longer suits the home or the cost of further work is becoming disproportionate.
If you need a diagnosis, see the boiler repairs service. Do not present a repair as a guaranteed alternative without an assessment.
How long does a new boiler take to fit?
A straightforward same-position replacement is normally quicker than a relocation or system conversion. The time depends on the boiler type, access, pipework, flue, controls, cylinder or tank work and any making-good requirements.
The installation quote should distinguish the boiler work from separate plastering, decorating, flooring or other building work. Read the guide to how long it takes to fit a boiler.
Can you spread the cost of a new boiler?
Finance may be available, subject to status, eligibility, lender approval and current availability. Do not compare finance only by the monthly payment. Check:
•cash price;
•deposit;
•APR;
•repayment term;
•total amount payable; and
•any conditions or fees.
See the current boiler finance options only after confirming that the terms and availability are current. Finance should be treated as an optional secondary route, not as a guaranteed offer.
New boiler installation in local areas
The work required usually affects the final boiler price more than the postcode alone. If you are looking for a local installation page, use the city that is relevant to the property rather than linking to every city from the same article.
These links are local service destinations. Confirm current coverage by full postcode before promising availability.
Gas Safe installation and certification
Gas boiler installation must be completed by a suitably qualified Gas Safe registered engineer whose competence covers the relevant work.
The installer should also ensure that the work follows the applicable Building Regulations and that the required notification or certification evidence is provided. Ask what documents you will receive after commissioning and warranty registration.
Frequently asked questions
How much does a new boiler cost in 2026?
The current Let’s Heat package information displays fully fitted starting prices from £1,799 for an Essential Combi, £2,350 for a Smart Combi and £2,999 for a System Boiler Upgrade. These are starting prices and suitability, availability, VAT treatment, inclusions and the final price must be confirmed for the property.
What is included in a new boiler installation?
The exact inclusions depend on the selected package and property. Listed package inclusions may include the boiler, standard flue, controls, magnetic filter, chemical system flush, corrosion inhibitor, removal of the old boiler, commissioning and a first annual service. Check the final quotation for exclusions and additional work.
Does a new boiler need a magnetic filter?
A magnetic filter can help capture magnetic debris in a central-heating system and protect the boiler. Whether it is included depends on the package and quotation. The current listed Let’s Heat packages include a magnetic system filter, subject to confirmation.
Do I need a power flush with a new boiler?
Not every system needs a full power flush. The system condition should be assessed first. Some systems may need appropriate chemical cleaning and treatment, while heavily contaminated systems may require more intensive cleaning.
Is it cheaper to keep the boiler in the same place?
Usually, if the existing position is suitable. Keeping the boiler in place can reduce pipework, flue and condensate changes. Moving it may still be worthwhile for access, space, renovation or system design reasons.
Can I keep my existing radiators?
Often, yes. Radiators that are correctly sized, free from serious corrosion or leaks and heating properly may not need replacing. Cold spots, leaks, sludge or poor output should be investigated before the new boiler is commissioned.
Is a combi boiler cheaper to install?
A straightforward combi-for-combi replacement is often one of the simpler installations. Converting from a regular or system boiler to a combi can cost more because the cylinder, tanks and pipework may need altering.
Should I replace a 10-year-old boiler?
Not simply because it is 10 years old. Consider its condition, reliability, repair history, parts availability, safety and suitability for the property. A proper assessment is better than using age as an automatic replacement rule.
How long does a new boiler installation take?
A straightforward replacement is normally quicker than a relocation or system conversion. The time depends on the property and the installation work required.
Can I pay monthly for a new boiler?
Finance may be available subject to status, eligibility, lender approval and availability. Compare the cash price, APR, deposit, repayment term and total amount payable, not only the monthly payment.
How often should a new boiler be serviced?
Follow the manufacturer’s servicing requirements and warranty conditions. Annual servicing is commonly required, but the exact requirements should be confirmed for the selected boiler. See the boiler service page.
Get an accurate new boiler price
Online prices are useful for initial budgeting, but the important figure is the price for your actual home.
When requesting a quote, provide as much information as possible about:
•your current boiler type and approximate age;
•the number of bathrooms;
•where the boiler is located;
•whether you want to move it;
•any known heating or hot-water problems;
•your preferred boiler type; and
•any planned renovation or fireplace work.
Let’s Heat can then assess suitable boiler options and the installation work required rather than relying on a generic headline price.
Mo Alwadi (Gas Safe Registered Engineer)
Mo Alwadi is Renewable Manager at Let’s Heat and a Gas Safe registered engineer (registration no. 977042), with experience in domestic heating and air conditioning. He contributes technical guidance on boiler installation, boiler replacement, heating systems, air conditioning and home energy solutions, helping UK homeowners understand their options and make informed decisions.
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