24/7 Boiler Installations & Repairs in Treharris.
Fast response. Energy-efficient solutions. Gas Safe registered engineers with over 25 years of experience — looking after Treharris homes day and night.
Years Experience
Gas Safe Registered
Same-Day Repairs
What we do
Services built around your home
From new boiler installs to a dripping tap on a Sunday night — one trusted team across heating, plumbing and bathrooms.
Boiler Installation
Combi, system and conventional boilers expertly fitted — supply, install and full safety testing in one visit.
Learn morePlumbing Services
Same-day repairs for leaks, low pressure, noisy pipes and boiler faults. Transparent pricing, no hidden fees.
Learn moreBathroom Design
Full bathroom design and installation, joined up with our plumbing and heating know-how end to end.
Learn moreWhy choose us
Why choose GavGas?
A trusted local team built on honest pricing, fast response and proper Gas Safe craftsmanship.
25+ Years Experience
Decades of hands-on work across South Wales — competitive pricing built on genuine local knowledge.
Gas Safe Registered
Fully qualified engineers working to the highest safety standards on every gas appliance and install.
Fast Emergency Response
Boiler down or pipes leaking? We answer the phone day or night and aim to be with you the same day.
How it works
Our Boiler Installation Process
From your first phone call to the moment your new boiler is firing, here's exactly what to expect.
- 1
Free Quote
- 2
Supply & Fit
- 3
Old Unit Removal
- 4
Testing & Safety Checks
- 5
Smart Thermostat Setup
- 1
Free Quote
- 2
Supply & Fit
- 3
Old Unit Removal
- 4
Testing & Safety Checks
- 5
Smart Thermostat Setup
"Gavin fitted our new combi boiler quickly, tidily and without any fuss. He talked us through every option, the price was fair and the heating has been faultless ever since. Genuinely the kind of tradesperson you hope to find."
Claire C.— Treharris
Need a Replacement Boiler or Repair?
One call. Honest advice. Same-day response wherever we can — we're here around the clock.