Boiler Installation
Fixed-price boiler installation from £2,499 in Newport, Cardiff and South Wales, fitted by our own Gas Safe engineers with up to 18-year ATAG guarantees.
Learn moreNewport · Cardiff · South Wales
NewDaikin air conditioningAsk about air conditioning
The boiler company Newport actually trusts.
Fixed-price boilers, named local engineers and up to 18-year guarantees. New boilers fully installed from £2,499 inc. VAT, with no hidden costs.
NewDaikin air conditioningAsk about air conditioning - Gas Safe registered (233679)
- F Gas certified (REFCOM)
- 4.9★ from 800+ independent reviews
- Finance option available
ATAG InstallersUp to 18-year guarantees
Registered No. 233679Verify on the register →
F Gas certifiedREFCOM REF1026669Find us on the register → (opens in a new tab)- ATAG Installer
- Vaillant Advance Installer
- Glow-worm Installer
- Baxi Main
- Daikin Partner
Heating and cooling, done once, done properly
From an emergency no heating or hot water callout to a full central heating design or a new air conditioning system, our own engineers do the work: Gas Safe registered for gas and heating, and F Gas certified through REFCOM for air conditioning.
Boiler Servicing
Annual boiler servicing to keep your boiler safe, efficient and warranty-valid, with emailed service reports and automatic annual reminders.
Learn moreBoiler Repair
Fast, reliable boiler repairs for all major brands across Newport and South Wales, with honest diagnosis and no unnecessary upselling.
Learn moreCentral Heating Systems
Design and installation of complete central heating systems, engineered around your home for efficiency, performance and cost.
Learn moreAir Conditioning
Daikin air conditioning for homes in Newport, Cardiff and South Wales: Sensira single split, and Comfora and Stylish multi split.
Learn moreLandlord Gas Safety Certificate (CP12)
Gas Safe engineers issue landlord gas safety certificates (CP12) instantly on site, for single properties and portfolios across Newport and South Wales.
Learn morePower Flushing
Professional power flushing to clear sludge and restore efficiency to older or sluggish central heating systems across South Wales.
Learn moreReal prices, published up front
The national installers made you fill in a form to see a price. We just show you. Every figure below includes VAT, the flush, the filter, a thermostat and the guarantee.
ATAGfrom £2,999
combi boiler · 18-yr guarantee10.1 L/min hot water at a 35°C rise
Finance option available
- ATAG iC 24 combi boiler
- Standard flue and fittings
- System chemical flush
- Fernox TF1 Omega magnetic filter
Vaillantfrom £3,299
system boiler · 10-yr guarantee
Finance option available
- Vaillant ecoTEC Plus 625 system boiler
- Standard flue and fittings
- System chemical flush
- Vaillant Boiler Protection Kit
Baxifrom £2,999
regular boiler · 5-yr guarantee
Finance option available
- Baxi 415 heat-only boiler
- Existing hot water cylinder and loft tanks retained
- Standard flue and fittings
- System chemical flush
Fixed price applies to standard swaps meeting a few clear conditions. Non-standard homes get an honest survey, never a wrong price.
Air conditioning
Air conditioning from Gareth Williams Heating
We now fit Daikin air conditioning in Newport, Cardiff, Cwmbran and across South Wales: Sensira for a single room, Comfora and Stylish as multi splits for several rooms. We are F Gas certified through REFCOM.
Explore air conditioning
Three steps to a new boiler
- 1
Get a fixed price
Answer a few questions and see a real, VAT-inclusive price, with no hidden fuel supplements.
- 2
Book your survey
A named engineer confirms the details and locks the price in writing.
- 3
Installed & guaranteed
Fitted by our own team, often in a day, with up to an 18-year guarantee on ATAG boilers.
Recent work across South Wales
Real installs in real homes, with honest cost bands.
£££Cardiff · Victorian townhouse
Central heating refit with designer radiators, Cardiff
New central heating system with vertical designer radiators and neat 10mm copper pipework throughout, balanced and commissioned.
£££Cardiff · 1930s semi-detached
System boiler & cylinder upgrade, Cyncoed
Vaillant ecoTEC Plus system boiler and new unvented cylinder installed, seven radiators balanced, full system flush and smart controls.
££Cwmbran · Modern townhouse
ATAG combi install, Cwmbran
ATAG iC combi fitted with an 18-year guarantee, relocated from the kitchen to the utility room, external flue and new condensate route.
££Newport · Victorian mid-terrace
Combi boiler replacement, Maindee
Old back boiler removed and replaced with an ATAG i28C combi, system power-flushed, magnetic filter and wireless thermostat fitted. One-day install.
££Newport · Mid-terrace
Combi install with vertical loft flue, Newport
Combi boiler fitted with a vertical flue routed neatly through the loft where a standard horizontal flue wasn't possible.
£Newport · 1970s semi-detached
Full system power flush, Newport
Sludged-up system power-flushed with the Kamco Quantum CF90, corrosion inhibitor added and a magnetic filter fitted. Radiators hot top-to-bottom again.
Rated 4.9 out of 5 by 800+ customers
We don't cherry-pick the nice ones. Read every review, on the independent platforms our customers actually use.
4.9 average across 3 independent review platforms, as of August 2026
Review on CheckatradeLorenzo and Dan couldn't have been more helpful with my Tado installation. Dan talked me through the hardware and answered all of my questions!
Review on CheckatradeGareth Williams Heating Ltd did an excellent job removing our old, non-functional boiler and installing a new one. They guided us in selecting a reliable and efficient brand. I would highly recommend their services to any prospective clients.
No heat or hot water?
We answer the phone. And we turn up.
A real, local engineer, not a call centre. Tell us what's wrong and we'll get you sorted.