Welcome to Cosywarm Heating & Plumbing ● Established 1976 ● Cardiff & South Wales
029 2061 5111

Tap to call — Emergency call-out available

Get Free Quote

Cardiff Plumbing, Heating & Gas Experts

Cardiff's Trusted Plumbers, Gas & Electrical Engineers Since 1976

Nearly fifty years serving Cardiff and South Wales — Worcester Bosch accredited, Gas Safe registered and Which? Trusted Trader. From boiler installs to full bathroom fits, we get it done right, first time.

Get a Free Quote Call 029 2061 5111
Gas Safe Registered
Worcester Bosch Accredited
10-Year Boiler Guarantee
Heating engineer installing a Worcester Bosch boiler in a Cardiff home
Est
1976
Cardiff Trusted

Worcester Bosch Accredited Installer

New Boilers Installed With a 10-Year Guarantee

As Worcester Bosch Group Accredited Installers, we supply and fit the right boiler for any home — from compact combi units to high-output system boilers — backed by a full 10-year guarantee for total peace of mind.

Book a Free Survey View Service Plans
Worcester Bosch Accredited
Free Quotes
All Budgets Covered
Wall-mounted combi boiler installed by Cosywarm in a Cardiff property
10 yr
Boiler Guarantee

Bathrooms, Kitchens & Electrics

One Team. Eight Trades. Zero Hassle.

Plumbing, gas, heating, electrical, bathroom and kitchen fitting — all delivered by one Whitchurch-based team. Coordinated, finished to a high standard, and emergency cover across three trades when you need it.

Get a Free Quote See All Services
Which? Trusted Trader
Emergency Call-Out
Cardiff & South Wales
Modern fitted bathroom installation by Cosywarm Cardiff
8
Services Covered

Accredited & Approved

Gas Safe Registered Worcester Bosch Group Accredited Installer Which? Trusted Trader
Cosywarm heating engineer at work in a Cardiff property
50
Years' Experience

About Cosywarm

Cardiff's Trusted Plumbing, Heating & Gas Company

Established in 1976 and based in Whitchurch, Cardiff, Cosywarm Heating & Plumbing has spent nearly fifty years building a reputation as one of South Wales' most trusted names in domestic and commercial plumbing, gas, heating and electrical work.

We're Gas Safe registered, Worcester Bosch Group Accredited Installers and accredited by Which? Trusted Trader — and every new boiler we fit is backed by a 10-year manufacturer guarantee. From a dripping tap to a full bathroom or kitchen refit, our team of highly trained local engineers delivers a first-class service at an affordable price.

Gas Safe Registered
Worcester Bosch Accredited
Which? Trusted Trader
Free Quotes on All Work
Get a Free Quote

What We Do

A Complete Service Under One Roof

Eight trades, one Cardiff-based team. From emergency boiler repair to a brand-new fitted kitchen, we cover every job our customers need — saving you the headache of juggling multiple contractors.

Book an Engineer

Plumbing

Leaking taps, blocked drains, appliance installs and all general plumbing work — domestic and commercial.

→

Boiler Installation

Worcester Bosch accredited installs for new builds and replacements, with a 10-year guarantee.

→

Boiler Servicing & Repair

Expert fault-finding and repair across all major boiler brands, plus annual servicing.

→

Gas Safety Certificates

CP12 landlord gas safety certificates and homeowner safety checks — fast turnaround.

→

Central Heating

Full system design, installation and repair — including radiators and underfloor heating.

→

Electricians

Domestic and commercial electrical work, EICR inspections, certifications and emergency call-outs.

→

Bathroom Fitting

Complete bathroom design, supply and installation — including all plumbing and tiling.

→

Kitchen Fitting

Full kitchen fitting in Cardiff — plumbing, worktops, tiling and flooring all included.

→

24/7 Emergency Cover

Emergency Call-Out Across Three Trades

One number, three emergencies covered — call us first.

Emergency Plumber

Leaks, bursts, no water

Emergency Gas Engineer

Boilers, leaks, no heat

Emergency Electrician

Power loss, faults, safety

Where We Work

Covering Cardiff & South Wales

Based at 112C The Philog in Whitchurch, Cardiff, our engineers cover every neighbourhood across the city and beyond — from the Valleys down to the Vale of Glamorgan.

Why Cosywarm

Six Promises We Make to Every Customer

01

Trading on Cardiff Doorsteps Since 1976

We've been fixing leaks, fitting boilers and rewiring homes across South Wales for nearly fifty years. That's not a marketing line — it's three generations of returning customers and the same trusted team turning up year after year.

02

Three Major Accreditations. Not One.

Gas Safe Registered. Worcester Bosch Group Accredited Installer. Which? Trusted Trader. Each one demands continuous training, audited workmanship and customer references — we hold all three because cutting corners isn't an option.

03

10-Year Guarantee on New Boiler Systems

Every new boiler system we install comes with a full 10-year manufacturer guarantee. No fine print, no asterisks, no "subject to" — a decade of cover from the day the engineer leaves your door.

04

Emergency Cover Across Three Trades

Plumbing emergency at 11pm? Boiler dead before a frosty morning? Tripped consumer unit on a Sunday? One phone number gets a qualified Cosywarm plumber, gas engineer or electrician to your door — we cover all three.

05

One Team for Bathroom, Kitchen & Beyond

Most plumbing firms hand you off to a tiler, who hands you off to an electrician, who hands you off to a fitter. We do plumbing, gas, electrics, bathroom and kitchen fitting in-house — one company, one quote, one finish date.

06

Free Quotes. Honest Pricing. No Surprises.

Every quote we give is free, properly itemised and exactly what you'll pay — barring genuine unknowns we'd never spot until the wall's open. No upselling, no "while we're here" surcharges, no shock invoices.

Boiler Servicing Plans

Protect Your Boiler with an Annual Service Plan

Spread the cost of an annual service over the year, lock in priority call-out, and keep your manufacturer warranty valid. Plans start from just a few pounds a month.

View Service Plans

What Cardiff Says

Trusted by Cardiff Homeowners & Landlords

Excellent
★★★★★
Verified Customer Feedback
Posted on

Cardiff Homeowner

Trustindex verifies that the original source of the review is Google.

★★★★★

The Cosywarm team replaced our old boiler with a new Worcester Bosch and sorted some radiator issues at the same time. Quote was clear, fitters were tidy and on time, and the 10-year guarantee gave us real peace of mind. Highly recommended.

Posted on

Whitchurch Landlord

Trustindex verifies that the original source of the review is Google.

★★★★★

Use Cosywarm for the gas safety certificates on all of my rentals. They are properly Gas Safe registered, paperwork is always sent through the same day, and tenants get on with them. Couldn't be easier — well worth the call.

Posted on

Penarth Customer

Trustindex verifies that the original source of the review is Google.

★★★★★

Had a full new bathroom fitted — Cosywarm handled the lot, from removing the old suite through to plumbing, tiling and electrics. One team in and out, no hassle juggling different trades. Finish is spotless and the price was exactly what was quoted.

Posted on

Heath Resident

Trustindex verifies that the original source of the review is Google.

★★★★★

Boiler packed up in November — phoned Cosywarm first thing and an engineer was at the door before lunch. Diagnosed and repaired the same day. The price was fair and they explained everything as they went. Will use again.

Posted on

Cyncoed Family

Trustindex verifies that the original source of the review is Google.

★★★★★

Full kitchen fit — plumbing, electrics, tiling and flooring. The lads turned up on time every morning, kept the place clean, and finished within the week they quoted. Genuinely impressed by how seamless it was.

Posted on

Barry Customer

Trustindex verifies that the original source of the review is Google.

★★★★★

Needed an EICR done before selling. Booked, completed and certificate emailed across within two days. Friendly electrician, properly explained anything that needed sorting. Saved me a lot of stress with the sale.

Your Home Deserves Expert Care

Get Your Free Quote Today.

Whether it's a leaking tap, a new boiler, a full bathroom fit or an electrical emergency — give Cosywarm a call and a qualified Cardiff engineer will be in touch.

Get a Free Quote Call 029 2061 5111

Emergency call-out available • Free quotes on all work • Cardiff & South Wales

From the Blog

Cardiff Heating & Plumbing Advice

View All Articles
Boiler replacement signs

Heating Advice

Five Signs Your Cardiff Home Needs a New Boiler

Knocking sounds, rising bills and inconsistent hot water — here's when it's time to consider a replacement.

Read More →
Gas safety certificate explained

Landlords

The Cardiff Landlord's Guide to Gas Safety Certificates

What CP12 inspections cover, how often you need one, and the legal implications of letting yours lapse.

Read More →
Bathroom fitting tips

Bathrooms

Planning a New Bathroom: A Cosywarm Walkthrough

From measuring up to choosing fittings — how to plan a bathroom refit that lasts the next 15 years.

Read More →

Got Questions?

Frequently Asked Questions

Yes — Cosywarm Heating & Plumbing is fully Gas Safe Registered (the only legal gas industry register in the UK) and our engineers' details are publicly verifiable on the Gas Safe Register. Anyone working on gas in your home must be on this register by law.

Every new boiler system we install comes with a full 10-year manufacturer guarantee. As Worcester Bosch Group Accredited Installers, we're authorised to offer the extended warranty cover their non-accredited competitors simply can't.

Yes — emergency plumbing, gas and electrical call-outs are all available across Cardiff and South Wales. Call 029 2061 5111 and you'll speak to a real person who can dispatch a qualified engineer.

Absolutely. Every quote we issue is genuinely free — no obligation, no callout charge for the survey, and no pressure to proceed. We'd rather earn your business with honest pricing than chase it with hidden fees.

Our team is based in Whitchurch, Cardiff and we cover every Cardiff neighbourhood as well as the wider South Wales region — including Penarth, Barry, Caerphilly, Pontypridd, Bridgend and Newport. If you're unsure, just call us.

Yes — both. Our kitchen and bathroom fitting service is fully in-house, covering the strip-out, plumbing, electrics, tiling, flooring and final fittings. One team, one quote, one finish date — no juggling contractors.

See All FAQs
Cardiff plumbing engineer working on a boiler

Still got questions?

Call our team direct:

029 2061 5111
Cosywarm plumbing and heating service in Cardiff

Free to Contact Us

Get a First-Class Service at an Affordable Price

Established 1976. Fully accredited. Free quotes on every job — fill in the form or give us a call.

Get a Free Quote

Fill in the form below and a Cosywarm engineer will be in touch — usually within the same working day.

We'll never share your details. Replies usually within the same working day.

Your Local Residential & Commercial Heating, Plumbing & Gas Company in Cardiff

C
Cosywarm Heating & Plumbing
★★★★★ Excellent Customer Feedback

Cardiff-based plumbing, heating, gas and electrical company established in 1976. Worcester Bosch accredited, Gas Safe registered, Which? Trusted Trader — covering Cardiff and the wider South Wales region.

Established 1976 Gas Safe Registered Worcester Bosch Accredited Which? Trusted Trader 10-Year Boiler Guarantee Local Cardiff Company

Services

Service Areas

Company

Free Quote Call Now