Assess First. Recommend Second.
Reliable warmth starts with the right specification. We supply and install combi, system and heat-only boilers from established manufacturers, matched to your property and household.
For a new boiler in Cardiff or a replacement across South Wales and the UK, we assess heating load, hot-water demand and installation requirements before recommending an appliance.
Start with your home
The system arrangement matters as much as the brand. These are the three main gas-boiler categories; fuel compatibility and the complete installation specification are confirmed during your assessment.
Mains gas, oil and LPG require different appliance and supply checks. Explore gas installation assessment, oil installation assessment or LPG installation assessment. Our Navien range includes separate oil models and gas models with documented LPG conversion support; compatibility is confirmed for the exact configuration. You can also explore air source heat pump assessment as a distinct heating technology.
Heating and hot water from one appliance, usually without a separate hot-water cylinder. A combi can save space, but incoming water pressure, flow and simultaneous shower use matter.
Explore Combi BoilersA boiler working with a separate hot-water cylinder. Stored hot water can help households with several bathrooms; cylinder capacity, recovery time and available space still need assessment.
Explore System BoilersA boiler used with a separate cylinder and external system components. Often considered when replacing an existing regular boiler; the cylinder, pumps, tanks and pipework must be checked together.
Explore Heat-Only BoilersUnderstand the differences between combi, system and heat-only boilers before deciding what may suit your home.
Which Boiler Type Do I Need?Explore what is involved when changing from one heating-system arrangement to another.
Explore Boiler ConversionsAnswer a few questions about your home, hot-water requirements and existing system to narrow down suitable boiler options.
Start the Boiler FinderAssess First. Recommend Second. The Boiler Finder helps prepare a shortlist; a professional assessment confirms suitability.
Established manufacturers
Explore boiler ranges from the manufacturers below. We compare suitable options around installation space, controls, warranty conditions, serviceability and your budget. A familiar brand name alone does not establish the right fit.
Worcester BoschExplore Greenstar ranges and system arrangements.Explore Worcester Bosch Boilers
VaillantCompare ecoFIT and ecoTEC boiler arrangements.Explore Vaillant Boilers
ViessmannExplore Vitodens ranges and fuel-specific options.Explore Viessmann Boilers
BaxiCompare Baxi ranges, boiler types and packages.Explore Baxi Boilers
Ideal HeatingBrowse Ideal ranges and installation considerations.Explore Ideal Heating Boilers
NavienExplore gas and oil boiler arrangements.Explore Navien BoilersClear starting point
The appliance is one part of the installation. Boiler specification, warranty, controls, system condition and installation complexity all affect the final quotation.
We explain pipework, flue, system-cleaning and other required work before you agree to proceed. Compare the complete proposed installation, alongside the price.
Explore smart heating controlsBoiler installation from
£1,790 inc. VATSubject to survey/assessment, qualifying boiler availability and installation requirements. The starting package includes a 5-year manufacturer warranty.
Warranty options typically range from 5–12 years, depending on the selected boiler/manufacturer and applicable terms. Longer warranties or a different specification may change the price; registration and servicing conditions apply.Plan the payment
Finance is provided by Humm Group Limited, subject to application, affordability, eligibility, approval and the provider’s terms.
Acceptance is not guaranteed. Review your assessment, complete quotation and all charges before deciding whether repayments are affordable.
Any applicable deposit, fees, repayment conditions and total payable are explained during your enquiry/application. Review the quotation and provider terms before applying.
Why SwiftHeat UK
Our boiler installers assess the property and system before recommending replacement. If an existing fault could be addressed through repair, we can discuss that route too.
Ask about boiler repair and diagnosisWales’ Boiler Installer & Heating Contractor of the Year 2026 — Winner
UK National Boiler Installer & Heating Contractor of the Year 2026 — National Finalist
Gas Safe registered • Registration 978273
Customer-first assessment across Cardiff, South Wales and the UK.
Read about our Wales awardFrom enquiry to installation
Tell us what you need from your heating. We will explain the next step and the information needed to make a sound recommendation.
Helpful answers
The heating output depends on your home's heat loss. Hot-water demand, water-supply performance and the system design also affect the choice. Bedroom count alone is not enough; an assessment establishes a suitable specification.
A combi may suit a home with limited space and suitable water-supply performance. A system boiler with a cylinder may better support stored hot water for several bathrooms. We assess your household's demand and existing system before recommending either.
Installation starts from £1,790 inc. VAT for a qualifying straightforward replacement: one bathroom, fewer than 10 radiators and a standard horizontal flue. The starting package has a 5-year manufacturer warranty. Your final price is subject to survey, boiler specification, controls, system condition and installation requirements.
A straightforward replacement can often be completed in a day. A conversion, relocation or wider heating upgrade may take longer. We confirm the expected schedule and any interruption to heating or hot water after assessing the work.
Warranty options typically range from 5 to 12 years, depending on the boiler, manufacturer and applicable terms. Registration, servicing and installation conditions may apply. We confirm the warranty for the proposed model in your quotation.
0% finance options are available over 3, 6, 9 or 12 months through Humm Group Limited, subject to application, affordability, eligibility, approval and provider terms. Any applicable deposit, fees and repayment conditions are confirmed during your enquiry/application. Acceptance is not guaranteed.
Removal and disposal of the appliance being replaced are normally discussed as part of the installation scope. We confirm what is included in your quotation; cylinder, tank or other system removals may need separate work.
A property and system assessment is needed before we confirm suitability and a final quotation. Photographs and an initial discussion can help us prepare. We explain whether a home visit is required to check supply, pipework, flue, access and system condition.
Your home. Your requirements.
Start with a conversation and an assessment. We will help you understand the suitable options.
