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JSM Heating Services Limited
Expert Boiler & Central Heating Engineers

JSM Heating Services Ltd

Expert Boiler & Central Heating Engineers

From new boiler installations to repairs, servicing and air conditioning, we provide dependable heating services throughout Monmouthshire, Gwent and Cardiff. Honest, reliable and fairly priced, with a 12-month workmanship guarantee for added peace of mind.

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5.0/5Average Review Score (37 reviews)

37 Five-Star Reviews

Google
“Jamie did an excellent job at sorting out my non functional stopcock. He offers a professional service and is an extremely pleasant gentleman to deal with. I would not hesitate to recommend Jamie for any plumbing requirements.”— Google

Services

Our Services

Expert heating services across Monmouthshire, Gwent and Cardiff

LPG Boiler Installation
01

LPG Boiler Installation

Supply and install LPG-compatible combi, system or heat-only boilers for properties off the mains gas network. Clear advice, Gas Safe fitters and ongoing servicing for rural homes across Gwent and Monmouthshire.
Air Source Heat Pumps
02

Air Source Heat Pumps

Premium Vaillant and Worcester Bosch air source heat pumps, supplied, installed and commissioned by local, experienced engineers. Full property assessment, grant advice and reliable aftercare from a Penperlleni-based team.
Boiler Installation
03

Boiler Installation

Full gas boiler installation across Monmouthshire, Gwent and Cardiff — free quotations, Gas Safe installation and a tidy handover with user instruction from a local, family-run team with 24 years' experience.
Central Heating System Installation
04

Central Heating System Installation

Complete central heating installations and upgrades across Monmouthshire, Gwent and Cardiff. Radiators, thermostats, system design and balancing to improve efficiency and heating distribution — Gas Safe engineers and a 12-month workmanship guarantee.
Unvented Cylinder Installation
05

Unvented Cylinder Installation

Mains‑fed unvented cylinders fitted by local Gas Safe engineers. Professional sizing, compliant commissioning and a 12‑month workmanship guarantee across Monmouthshire, Gwent and Cardiff.
Boiler Servicing
06

Boiler Servicing

Annual boiler servicing to keep your heating reliable, efficient and safe. Gas Safe engineers with 24 years’ experience across Monmouthshire, Gwent and Cardiff — tidy work and a clear service report.
Boiler Repairs
07

Boiler Repairs

Rapid, reliable boiler repairs across Monmouthshire, Gwent and Cardiff. Fault-finding, pump and valve repairs, leak fixes and breakdown callouts carried out by Gas Safe engineers.
Air Conditioning
08

Air Conditioning

Professional air conditioning installation, servicing and repairs for homes and light commercial properties across Monmouthshire, Gwent and Cardiff.
Local, family-run heating specialists

ABOUT US

Local, family-run heating specialists

Jamie leads a small team with practical, no-nonsense experience delivering installations, repairs and servicing for homes across Monmouthshire, Gwent and Cardiff. After 24 years in the trade the focus is the same: safe, compliant work, clear communication and a tidy finish every time.

  • 24+ years' hands-on heating experience
  • Gas Safe registered engineers; Worcester Bosch & Vaillant partners
  • Public liability insured with a 12-month workmanship guarantee
  • Approved Heat Geek installers
  • Local team — direct contact with engineers and quick callouts across Monmouthshire, Gwent and Cardiff
Learn More About Us

WHY CHOOSE US

Why Choose Us

Gas Safe registered engineers

All gas work is carried out by Gas Safe registered engineers to keep installations and repairs safe, compliant and fully certificated.

Two decades of trade experience

Over 24 years installing boilers, central heating systems and carrying out repairs and servicing on traditional and modern properties.

Worcester Bosch & Vaillant partners

Approved installers for Worcester Bosch and Vaillant — access to manufacturer support, recommended components and professional commission standards.

Insured and backed by guarantee

Work is protected by public liability insurance and a 12-month workmanship guarantee on installations for peace of mind after the job is done.

Heat Geek Installers

As approved Heat Geek installers, we have completed specialist training in heat loss calculations, hydronics, flow temperatures and efficient heat pump system design.

Prompt, clear communication

Transparent advice, straightforward quotes and timely updates so you always know what to expect from diagnosis to completion.
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REVIEWS

What Our Customers Say

“Quick and efficient, managed to book in a boiler service within the same week. Jamie arrived promptly, completed the boiler service and highlighted potential issues to look out for. Friendly and knowledgeable- would use again.”

— Adam Balson

GoogleGoogle2026-06-25
“Jamie did an excellent job at sorting out my non functional stopcock. He offers a professional service and is an extremely pleasant gentleman to deal with. I would not hesitate to recommend Jamie for any plumbing requirements.”

— Carol Anne Morgan

GoogleGoogle2026-06-25
“An amazing service provided by Jamie. From start to finish the correspondence was clear and polite. Jamie is very professional. I'm that happy with his services that I will be asking him to come back for further work that needs to be done 👍🏼 …”

— Melanie Seabourne

GoogleGoogle2026-06-25
“So happy I called Jamie! Had an urgent job, he got back to me quickly with great communication and was here within 24hrs. Did a perfect job going over and above what was expected and both he and his colleague were a pleasure to meet. Was astonished with the price considering the quick attendance and work carried out. Will 100% be using his services again.”

— Jennifer

GoogleGoogle2026-06-25
“Strongly recommend Jamie for his prompt, reliable and courteous service! He resolved our boiler issues and left us with no mess and a nice warm house.”

— Dewi Watkins

GoogleGoogle2026-06-25
“Jamie recently fitted a new boiler and radiators for us and we’re really pleased with the whole experience. From start to finish, they were efficient, professional, friendly and very tidy while working in the house. The installation was completed to a high standard. It’s great to find someone reliable who takes real pride in their work. Highly recommend Jamie to anyone looking for heating or boiler work done.”

— Rachael Sykes

GoogleGoogle2026-06-25
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OUR ACCREDITATIONS

Gas Safe Registered
Worcester Bosch
Vaillant Approved

Ready to Install or Upgrade Your Heating System?

Whether you need a new boiler, annual servicing or a heating repair, we're here to help. Honest, reliable and fairly priced service backed by a 12-month workmanship guarantee.

Get your free, no-obligation quote today.