Plumbers and Electricians in Cardiff 

Welcome to Cosywarm Heating and Plumbing. Our company began back in 1976 and since then we have strived to build ourselves as a reputable company. Our team here at Cosywarm, are expert plumbers and electricians in Cardiff. Furthermore, we have been providing customers in and around Cardiff with our professional electrical, heating, plumbing and home improvement services for the past 30 years.

We are a small family-run business that succeeds only because of the reliable and efficient service that we provide. Additionally, our engineers are vetted and skilled professionals and all are MCS and Gas Safe registered. They are also fully covered by public liability insurance for further peace of mind.

Boilers, Heating, Plumbing & Bathrooms
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worcester boilers
Boiler Servicing & Repairs
Boilers, Heating, Plumbing & Bathrooms
Central Heating
Bathroom Design

Cosywarm Home Improvement Services

Here at Cosywarm, we specialise in heating, plumbing and electrical services. However, our experts also have the experience to offer a comprehensive range of other specialist home improvement services. Our plumbers and electricians in Cardiff can offer the following additional services;

Home Improvements

Installing heating and plumbing systems are our speciality but there are also other services that we provide which include:

Boiler Installation

As an Official Worcester-Bosch Approved Installer, we are qualified experts in the installation of their CDI range of boilers and all newly-installed boilers come with a Seven Year Guarantee for parts and labour.

Repairs and Upgrades

Additionally, we can repair damaged or broken heating installations or upgrade the system entirely by adding or removing radiators or thermostatic valves to maximise efficiency.

Bathroom Design

Our team of experts can assist you in designing your ideal bathroom and then install it in double-quick time.


A low cost annual maintenance contract with Cosywarm will detect problems early and ensure your heating system runs smoothly.

Free Home Improvements Quotes

So, why not call us on 02920 615111 to discuss your requirements and see how we can help you. We are available 7 days a week and will be happy to give you a no-obligation free quotation on your project. Furthermore, feel free to contact us using the enquiry form on our “Contact Us” page. We look forward to hearing from you very soon!

Send Us Your Enquiry

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our accreditations


  • Mr & Mrs Chand of Treforest We are very impressed with our new Vaillant 937 boiler, which was installed, by Dave and Colin. From the first visit (by Alex ‘the boss’), CosyWarm carried out the job promptly and professionally. We were particularly impressed with Dave who was willing to listen to us (‘the customer’ as he puts it) and ensure that all our requests are discussed and fulfilled. Dave is an asset to CosyWarm and his exceptional work ethics is highly commendable. We, without any reservation, will recommend CosyWarm to all our friends and family as their professionalism and customer driven commitment is miles ahead of others competitors who have consistently let us down. Thank you very much to Alex, Dave, Kevin and Collin. Submitted By: Chandran

    Mr & Mrs Chand

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