New Boiler Installation Cardiff & South Wales

Assess first. Recommend second.

The right boiler starts with the right assessment

A boiler should not be selected from floor area or bedroom count alone. The property’s heat loss, hot-water demand, existing pipework, radiator output, controls and available fuel all affect the correct specification. SwiftHeat UK brings those points together before recommending a combi, system or heat-only boiler.

Our work covers straightforward replacements, boiler relocations, combi conversions and wider heating upgrades. Where keeping part of the existing system is sensible, we say so. Where old controls, undersized radiators or poor circulation would hold a new boiler back, we explain the evidence and the options before work begins.

We install established manufacturers including Worcester Bosch, Viessmann, Vaillant, Baxi, Ideal and Navien. Brand is only one part of the decision: access to support, warranty conditions, modulation, controls compatibility, available space and long-term servicing all matter too.

Service scope

What a considered installation can include

A property and existing-system assessment before the final specification

Combi, system and heat-only boiler options explained in plain English

Review of hot-water demand, radiator performance, controls and pipework

System preparation, flushing and water treatment appropriate to its condition

Safe installation by appropriately registered specialists for the fuel type

Commissioning, controls guidance and handover information

Manufacturer warranty registration where applicable

A 12-month SwiftHeat installation guarantee

Whole-system thinking

Efficiency is about the complete heating system

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.

How we work

A clear path from first conversation to confident handover.

01

Assess

We discuss your needs, inspect the existing system and identify the property constraints that affect the design.

02

Specify

You receive a clear recommendation and quotation explaining the proposed boiler, controls and any supporting work.

03

Install

The system is fitted carefully, protected during the work and prepared in line with the agreed scope.

04

Commission

We test operation, set controls, explain use and complete the relevant handover and registration steps.

When to consider it

A good fit for homeowners who want

A dependable replacement for an ageing or unreliable boiler
Better hot-water performance or a change in household demand
A combi conversion or redesigned heating arrangement
A clear comparison of suitable boiler and controls options
An installation planned around long-term serviceability and efficiency

Helpful answers

Boiler installation FAQs

How much does a new boiler installation cost?

SwiftHeat UK boiler installations start from £1,790 including VAT. This illustrative starting package is based on a property with 1 bathroom, fewer than 10 radiators and a qualifying boiler model from a participating manufacturer, supplied with a 5-Year Manufacturer Warranty. The final quotation is subject to survey, boiler availability and the property’s heating and hot-water demands, existing system, installation requirements and selected boiler specification. Manufacturer warranties range from 5 to 12 years; longer-warranty options or alternative qualifying models may alter the price.

How do I know which boiler size I need?

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.

Can you convert my existing system to a combi boiler?

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.

Which boiler brands do you install?

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.

Is finance available?

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.

Connected services

Boiler installation in Cardiff & South Wales

The right boiler starts with the right assessment

What a considered installation can include

Efficiency is about the complete heating system