Site survey and specification
We assess the property, confirm the right boiler type and flue route, check existing pipework and controls, and agree the scope with you before ordering parts.
TJ&H · St Asaph & North Wales
Boiler Replacement in St Asaph
Swap an old boiler for a modern, efficient unit, fully installed, commissioned and tested. Gas Safe and OFTEC accredited, with a 12 month workmanship guarantee and same-day emergency response.
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Professional Boiler Replacement Across St Asaph
Using premium-grade condensing boilers, manufacturer-approved parts and industry-standard flue kits, TJ&H replace old or inefficient units with modern combi, system or regular boilers. Installations are carried out to Gas Safe and OFTEC standards and include full system checks, flue works, safe commissioning, commissioning certificates and responsible removal of old equipment. Backed by 18 years' experience and a 12 month workmanship guarantee, we provide WhatsApp updates and same-day emergency call-outs across St Asaph and surrounding towns.
How It Works
Safe removal and installation
Old equipment is disconnected and removed. We fit the new boiler, flue, condensate and controls using manufacturer approved parts and industry-standard kits.
Commissioning and handover
We complete full system checks, safety tests and commissioning paperwork, leave commissioning certificates.
Why Choose us for Boiler Replacement?
Compliance and safety
Gas Safe and OFTEC accredited engineers carry out flue works, pressure and safety tests and provide the required commissioning certificates for peace of mind.
Proven experience
Nearly two decades on the tools means TJ&H handle tricky flue runs, older pipework and control upgrades with confidence and tidy workmanship.
Customer-focused aftercare
All work is backed by a 12 month workmanship guarantee, with WhatsApp updates, same-day emergency call-outs and clear handover instructions.
What this service covers
What the replacement includes: a full site assessment, correctly sized condensing boiler matched to your heat demand, manufacturer-approved components, industry-standard flue kits and full safety testing. We carry out pipework alterations where needed, fit or migrate existing controls and provide commissioning certificates. Old boilers and redundant parts are removed and disposed of responsibly.
Local, reliable service: TJ&H operate from St Asaph and cover nearby towns. Work is carried out to Gas Safe and OFTEC standards and finished to trade quality. For quick queries or photos of your existing boiler send a message via WhatsApp or call 01745 299210. For paperwork and bookings email enquiries@tjhplumbingheating.co.uk
Frequently Asked Questions
How long does a boiler replacement take?
Most straightforward replacements are completed in a day, but jobs that involve new flues, rerouting pipework or control upgrades can take longer. We explain the expected programme during the site survey and always allow time for safety checks and commissioning.
Will you remove and dispose of my old boiler?
Yes. We disconnect, remove and dispose of old boilers and redundant components responsibly as part of the replacement. Any hazardous materials are handled in line with current regulations.
Do I need a power flush when replacing my boiler?
Not always. If the system shows signs of sludge, cold radiators or poor circulation we recommend a power flush to protect the new boiler. We check the system during the site survey and advise accordingly.
Are your engineers certified to carry out boiler replacements?
Yes. TJ&H are Gas Safe and OFTEC accredited and work to current regulations. All installations include the necessary safety tests and commissioning paperwork.
What guarantees and warranties do I get?
You receive the boiler manufacturer's warranty as provided, plus TJ&H's 12 month workmanship guarantee on installation. We also provide commissioning certificates and advice on registering the manufacturer warranty where required.
Planning your quote
Replacement costs depend on your existing system, the proposed boiler and any changes to pipework, flue routing or controls. A survey helps identify what needs to be included in your quote.
Coverage & related services
Based in St Asaph, we cover surrounding North Wales towns. Check the areas we serve or contact us with your postcode.