About NJ Harkus Plumbing and Heating

Founded in 2013 by Nathan Harkus, NJ Harkus Plumbing and Heating has been serving Cardiff homeowners, landlords and businesses for over a decade. We're a family-run plumbing and heating company, built up over the years by treating every customer's home the way we'd want our own.

Over the years we've grown from a single van to a trusted local team, but the approach hasn't changed. We have an excellent local reputation in Cardiff and we're proud to be the most reviewed plumber in Cardiff on Google, with over 1,100 five-star reviews from customers across the city.

Qualifications, Compliance & Insurance

Safety and compliance are non-negotiable.

We hold the qualifications and credentials needed to carry out gas, heating and plumbing work safely and to the right standards across every job we take on.

• Gas Safe Registered (registration number 518700)
• City & Guilds qualified
• CIPHE member (Chartered Institute of Plumbing and Heating Engineering)
• Fully insured with public liability cover
• Companies House registered (Company Number 08762192)
• VAT registered (GB195141895)

All work is carried out by qualified engineers in line with current regulations and manufacturer requirements.

Accredited Boiler Installers

We're accredited to install and service boilers from the UK's most trusted manufacturers, including:

Accreditation isn't just a badge. It means we've completed the manufacturer's training and meet the standards required to install their boilers properly, which often means extended warranties for our customers. If you've got a specific brand in mind or want advice on what'll work best for your property, we can talk you through the options.

How We Work

We believe the best results come from doing the basics properly. Listening to what's actually going wrong, diagnosing accurately, and explaining what's involved in plain English. Whether it's a planned upgrade or an urgent repair, the approach is the same.

What you can expect from our team:

• Clear communication and honest, practical advice
• Reliable workmanship delivered to a consistently high standard
• Respect for your home, with tidy working practices and minimal disruption
• A focus on safe, long-term solutions rather than quick fixes
• Professional service from first enquiry to completion

What We Do

Our work covers a full range of domestic plumbing and heating services. From everyday plumbing repairs to heating system upgrades and boiler work, we deliver professional solutions tailored to your property and requirements.

Proud To Support Local Sports, Teams & Events

Cardiff has been good to us, and we believe in giving back to the community we've worked in for over a decade. We're proud sponsors of Cardiff City Football Club, alongside local youth football teams and Cardiff sporting events. Keep an eye out for our branding around the city!

Sponsorship isn't just about getting our name out there. It's about being part of the local fabric, supporting young people in the game, and helping local sport thrive across Cardiff and the Vale.

Areas We Cover

We’re based in Cardiff and carry out work across Cardiff and the surrounding areas, including Penarth, Sully, Barry, Cowbridge, Pontyclun, Llantrisant, and Dinas Powys. Being local means we understand the property types found throughout Cardiff and can provide a responsive, dependable service when you need it.

If you’re unsure whether we cover your area, get in touch and we’ll confirm availability.

Who We Work With

We provide plumbing and heating services for a wide range of customers and property types. Whether you’re dealing with a one-off issue or need ongoing support, we offer the same professional approach and attention to detail. We regularly work with:

• Homeowners
• Landlords
• Letting and property management agents
• Small commercial premises (where appropriate)

Contact Us

If you’d like to discuss a plumbing or heating job, request a quotation, or arrange a visit, please contact our team.

For urgent issues and emergency call-outs, call Nathan directly.

Call: 07859 896019
Email: info@cardiffplumbingandheating.co.uk Office: 180 Ffordd James McGhan, Cardiff, CF11 7JU

Photos can be emailed or sent via WhatsApp to help us assess the work more accurately.