Pressurised & Unvented Hot Water Cylinders

Why Choose Us?

If you are looking for specialist installers of pressurised unvented hot water cylinders in the Cardiff area of South Wales, Cosywarm Heating and Plumbing is the perfect solution. With over 30 years of experience in the industry, we have established a reputation in Cardiff for our expertise and top notch customer service. We are Worcester Bosch group approved installer.

Pressurised & Unvented Hot Water Cylinders

The pressurised unvented hot water cylinder is the modern method of storing hot water and passing it through to your taps and showers at home or office. Its popularity has grown rapidly due to significant improvements in its performance over the older style vented hot water tanks.

Unlike the vented hot water system which utilises a cold water storage tank, the sealed hot water system is fed directly with cold water from the mains. As the system operates at mains pressure, you don’t rely on gravity to move the hot water around the home. This ensures a much better flow rate and guarantees that you can enjoy satisfactory water delivery at the taps and the showers.


Since your unvented hot water system does not require you to maintain a cold water storage tank in the loft as the vented systems do, you will escape the potential freezing challenge the cold water storage tanks present during the long winter months.

What’s more, the unvented hot water system is essentially free from contamination since the system is sealed and there is no water storage cistern. Low operating noise level is an additional advantage as the noise generated during cold water filling of the storage cistern in the vented system is eliminated.

Pressurised unvented hot water cylinders come in a wide range of capacities. Our team of experienced engineers can customise your heating system to meet the needs of your home. They will help you select a pressurised unvented hot water cylinder of a size that will suit your home and lifestyle. Whether you want to install a cylinder that allows you to add solar water heating to your system or you prefer a cylinder you can use with a boiler, our team of experts are up to the task.

Pride In Our Work

Our engineers are highly qualified and fully vetted. They are all gas safe registered and they hold a qualification that complies with extant building regulations. With their excellent standard of workmanship in heating installations, you can be sure that your unvented cylinders are securely installed and that they will be operating at a safe pressure.

We take great pride in the satisfaction of our customers and we can guarantee that we will beat any like for like quotation from British gas/Swalec without compromising the quality of our service. If you are looking for reputable installers of pressurised unvented hot water cylinders in the Cardiff area, contact us for a free quotation and we will be more than happy to provide you with an excellent service.


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