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Boiler replacement, relocation & conversion
Need a new boiler in Cardiff or South Wales? SwiftHeat UK Group Ltd can replace your boiler in the same spot, move it or convert a cylinder system to a combi. We assess your home and give you a written fixed-price quote for the agreed work before you book.
Tell us your postcode and what you need. We will discuss availability, arrange any assessment needed and explain the price before you book.
Assess first. Recommend second.
If two showers run at the same time, say so at the survey. We check how much hot water your household uses, what your incoming water supply can deliver and how much heat your home needs. That helps us decide with you whether to keep a cylinder, choose a combi or retain the arrangement you already have.
Cold rooms, awkward controls or plans for an extension can change the recommendation. We check what your radiators and pipework can support, what can stay and which changes belong in the quotation.
When a Main boiler began to fail, we replaced it with a Baxi 830 combi. We retained the homeowner’s Hive V4 controls, flushed the system and fitted a new vertical flue. The controls could stay even though the boiler and flue needed changing.
See the Baxi 830 replacement in WhitchurchOur assessment led to a Worcester Bosch Greenstar 1000 30kW combi. The job included pipework changes, magnetic filtration and wireless controls. The project film shows the work around the appliance as well as the finished installation.
Watch the Cardiff Greenstar replacementA Cardiff Baxi 800 installation paired the new combi with wireless controls and system protection. When an Aberdare homeowner moved their boiler from a bedroom to the kitchen, the job also needed new gas pipework. In our Ynysybwl back-boiler conversion, we removed the old cylinder and fitted Hive controls and radiator valves.
Tell us what you want to keep, move or remove. We’ll set out those items in your written boiler replacement quote.
Your next step
Send your postcode and contact details to request a free, no-obligation quote. If you know them, add the boiler model, number of bathrooms and whether you want to keep the boiler in the same position. We’ll discuss the survey and confirm the agreed work and price in writing.
No obligation. Your appointment is confirmed when we agree a date and time. Any additional work is quoted before you approve it.
Prefer to speak to us?0800 043 3464Understand your quotation
From £1,790 including VAT for the Ideal Atlantic C24 24kW gas combi boiler with a complimentary Hive Mini thermostat and a five-year manufacturer warranty. For a straightforward gas boiler replacement with a standard horizontal flue in a home with one bathroom and fewer than 10 radiators. Subject to survey and availability.
Your Boiler Management Condition Report is free of charge and complimentary to the installation service.
Boiler relocation, system conversion, flue or gas-pipe alterations, electrical work, additional radiators and different controls or warranty options may affect the price. Your written quotation identifies what is included and any separately priced work before you decide.
Read the full pricing and package guide · Understand finance, deposits and charges
The starting price is subject to survey, availability and final specification. Oil and LPG installations require their own assessment and quotation.
Tell us whether you have a combi or a separate hot-water cylinder and if you want to move the boiler. We assess hot-water demand, the existing supply, flue route and drainage before confirming the work. Explore mains gas heating in Cardiff.
Is the boiler indoors or outside? Tell us where the oil tank sits and whether you plan to keep it. We assess access, the fuel supply and the proposed boiler position, then specify any tank or pipework work separately. Plan an oil boiler replacement.
Tell us whether you use a bulk tank or cylinders and who supplies your LPG. We check which boiler is suitable for that supply and clarify any work your supplier needs to arrange. Plan an LPG boiler installation.
Service scope
Whole-system thinking
A modern boiler can still waste energy if it is connected to an unbalanced system, controlled badly or asked to run at unnecessarily high temperatures. That is why our specification considers how heat moves around the property—not only the appliance on the wall.
Depending on the home, useful improvements may include upgraded controls, weather or load compensation, radiator changes, system balancing or attention to water quality. The goal is dependable comfort and a boiler that can operate as efficiently as the property allows, rather than simply replacing one box with another.
Planning this work alongside other upgrades? Explore Whole Home Energy Solutions to consider heating, hot water, solar and storage together. Find local heating guidance and enquiry details for your area.
Our Pontypool project film shows an Ideal Atlantic C24 24kW combi boiler installation, with views of the appliance, copper connections and magnetic filtration. Explore the dedicated case study to see the work.
If a fault prompted your enquiry, tell us the make, model, fault history and what has changed. An engineer can assess whether a repair would restore reliable heating. If replacement makes sense, your quotation will identify the boiler, controls and supporting work separately.
If you already have a model in mind, use the guides to compare its hot-water performance, controls and warranty. We confirm the exact model and manufacturer terms in the written quote.
Use our local pages to send your postcode and heating requirements for an installation assessment. Aberdare homeowners can also explore a documented boiler relocation with radiator and control improvements. For homes in Cowbridge or Merthyr Tydfil, describe the existing boiler, any hot-water cylinder and changes you want to make; the survey determines the specification and availability.
Before booking, ask the quotation to explain the proposed boiler position, access needs, flue and condensate routes, any electrical or pipework alterations, and arrangements for the old appliance and waste. Discuss when heating or hot water may be unavailable, and tell us about any household needs that affect the work. The survey and agreed scope determine the timetable; an enquiry does not confirm an installation date.
At handover, make sure you understand the controls and have the commissioning record, applicable compliance documentation, manufacturer registration information and the separate installation-guarantee terms. Clarify the servicing requirements for the chosen manufacturer cover and how to contact the team for aftercare.
SwiftHeat UK Group Ltd was named the regional Boiler & Heating Installer and Contractor of the Year winner at the Wales Energy Efficiency Awards 2026 and received a Special Commendation in the national category. The organiser records these outcomes publicly.
Awards provide background about the company. Your own quotation should still explain the property assessment, specification, workmanship responsibilities and aftercare for the installation you are considering.
A system or heat-only boiler can serve a separate hot-water cylinder. A combi supplies hot water on demand. If you are thinking about removing the cylinder to free up space, tell us how many outlets you use together so we can assess whether a combi will meet that demand.
How we work
We discuss your needs, inspect the existing system and identify the property constraints that affect the design.
You receive a clear recommendation and quotation explaining the proposed boiler, controls and any supporting work.
The system is fitted carefully, protected during the work and prepared in line with the agreed scope.
We test operation, set controls, explain use and complete the relevant handover and registration steps.
When to consider it
Helpful answers
A swap in the same position usually involves fewer changes than moving the boiler or removing a cylinder. Before you book, we agree the installation timetable, explain when heating or hot water will be off and discuss any access or household needs that affect the work.
Yes. SwiftHeat UK Group Ltd is based in South Wales and serves homes across Wales, with boiler installations available across the UK. Home and away supporters who find us through Cardiff City Stadium are welcome to enquire. Send your postcode and project details so we can explain the assessment, installation arrangements, quotation and aftercare for your property.
Often, yes. We assess their condition and output alongside pipework, water quality and controls. In a Cardiff home with an extension or changed room layout, cold rooms may need separate attention even when the boiler is being replaced. Your quotation identifies what can remain, any cleaning needed and separately specified radiator or pipework work.
Yes. The Boiler Management Condition Report is free of charge and complimentary to the service offering of SwiftHeat UK Group Ltd, including every boiler service and installation. It explains the findings and practical recommendations relevant to your system and the work undertaken. Any additional repair or upgrade work is quoted separately before you approve it.
From £1,790 including VAT, we supply and install an Ideal Atlantic C24 24kW gas combi boiler with a complimentary Hive Mini thermostat and a five-year manufacturer warranty. For a straightforward gas boiler replacement with a standard horizontal flue in a home with one bathroom and fewer than 10 radiators. Subject to survey and availability. We confirm any additional work in your written quotation.
The correct output depends on the property heat loss, hot-water requirement and system design. SwiftHeat UK assesses those factors before confirming a specification rather than relying on a single generic rule.
Often, yes. A conversion still needs an assessment of incoming water performance, household hot-water demand, pipework and available installation space. We explain whether a combi is genuinely the best fit.
We work with established manufacturers including Worcester Bosch, Viessmann, Vaillant, Baxi, Ideal and Navien. The recommendation is based on the home, budget, controls, warranty and support requirements.
Eligible installations may be financed over 3, 6, 9 or 12 months at 0% interest through Humm Group Limited, subject to application, status, eligibility and Humm’s terms. SwiftHeat explains its charges before you apply.
After your appointment
Had work completed by SwiftHeat UK Group Ltd? You are welcome to leave an honest Google review in your own words. You can describe the work and, if you are comfortable, your town. Please leave out your street address and personal details.
Connected services
Explore these if your assessment identifies a wider need.
Compare Hive, TADO, Nest and boiler controls, with OpenTherm benefits and model compatibility. Smart thermostat installation in Cardiff and South Wales.
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Radiator replacement in Cardiff and South Wales. Explore sizing, valves, balancing and quotation scope, then arrange a SwiftHeat UK assessment.
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Free Boiler Management Condition Reports from SwiftHeat UK Group Ltd, complimentary with every boiler service and installation. View real report examples.
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Explore anonymised service and repair reports showing how we explain findings, document the work and set out practical next steps.
The heart of your home, in expert hands.
From Cardiff and South Wales to homes across the UK, tell us your postcode and the boiler installation you are planning. We will explain the assessment, quotation and next steps.