Mountain Ash Trusted Worcester‑Accredited Heating Specialist
Boiler installation, servicing and repairs across South Wales — Worcester Bosch accredited, Gas Safe registered and local to Aberdare, Merthyr Tydfil and Cardiff.
5.0 stars|21 verified reviewsOur Services
Expert heating services across South Wales, Aberdare, Mounty Prees, Merthyr Tydfil
Boiler Installation
Supply and fit of new Worcester Bosch and Ideal boilers with full commissioning, manufacturer-backed warranties and Gas Safe certified installation across South Wales.
Learn more
Boiler Servicing
Annual and one‑off boiler servicing across South Wales. Gas Safe registered and Worcester accredited engineer delivering safety checks, efficiency tuning and manufacturer‑compliant paperwork.
Learn more
Boiler Repairs
Fast, reliable boiler fault diagnosis and repairs across South Wales. Gas Safe registered and Worcester-accredited — parts and labour to get heating and hot water back on same day where possible.
Learn more
Plumbing Maintenance
Routine plumbing maintenance and minor repairs to protect your home. Fast, certified work across South Wales — from leak fixes to stopcock checks and preventative care.
Learn more— ABOUT US
Local, accredited heating engineers
Daniel Davies Gas has delivered reliable boiler work since 2013. Daniel is Worcester Bosch accredited and Gas Safe registered, offering manufacturer-backed support, clear workmanship guarantees and fast, knowledgeable service for homeowners across South Wales.
13 years' experience serving South Wales (since 2013)
Worcester Bosch accredited with direct manufacturer support and access to warranties
Gas Safe registered and insured with £2 million public liability cover
High practical experience — around 70–80 boiler installations a year and long manufacturer-backed warranties (for example Worcester Bosch warranties up to 12 years) plus a 12‑month workmanship guarantee
— WHY CHOOSE US
Why Choose Us
We take pride in delivering exceptional service, backed by years of experience and a commitment to quality workmanship.
Worcester accredited
Official Worcester accreditation means expert install and commissioning of Worcester Bosch systems, direct access to manufacturer technical support and smoother warranty handovers.
Gas Safe registered & insured
All gas work is completed by a Gas Safe registered engineer and backed by £2 million public liability insurance for your safety and peace of mind.
Generous manufacturer warranties
We specify systems with long manufacturer-backed warranties and always confirm warranty entitlements at quote stage — plus our standard 12‑month workmanship guarantee.
Local and responsive
Based in South Wales, Daniel offers same-day responses for non‑emergency callouts and prompt, face‑to‑face quotes in Aberdare, Merthyr Tydfil and surrounding areas.
What Our Customers Say
View all reviews“Dan is very professional and very reliable, great job on to the next plumbing project”
Paulwithers12@gmail.com Cruncher12
“I have been with Dan for years. Outstanding service everytime. Always goes out of his way to get the job done and make you smile at the same time. A rare talent in the heating industry.”
Andrew Pullman
“100% recommend Dan, very professional and gets the job done to a top standard!”
Bethan Picton
“Excellent service”
George Adkins
“good”
George Adkins
“Excellent and professional service”
Xolo Brain Gam3r
Ready for a safer, warmer home?
Arrange a straightforward, no‑nonsense quote or a rapid non‑emergency visit. Daniel Davies Gas is Worcester‑accredited, Gas Safe registered and fully insured — trusted heating work across South Wales.