As we've previously mentioned, Access Training have made a few changes to the way we run the Unvented Cylinders plumbing course recently. With the new City & Guilds syllabus our course follows, students are now required physically commission and maintain a cylinder in order to achieve the qualification. This is important as it will make sure candidates are physically familiar with unvented cylinders rather than just having a theoretical knowledge of how to handle them. Knowing in theory is all well and good, but this is one area inparticularly that can go wrong without the right skills and know-how.

An Unvented Cylinder is a hot water storage system that relies on storage cylinders fed directly from cold water mains and do not incorporate a vent pipe to relieve excess build-up pressure to atmosphere. The pressure for the hot water system is then derived from the mains pressure supply rather than a cold water storage tank. The advantages of using such a system include:

  • Balanced pressure in both hot and cold taps for showers
  • Higher water pressures available for hot taps
  • No storage cistern, eliminating any risk of contamination
  • Can be fitted anywhere in the house, making them suitable for one-storey dwellings
  • Quicker to install with less pipework and no cold storage tanks needed in the loft
  • Can possibly be used with smaller diameter pipework
  • Gives architects and service designers greater flexibility of design

Unvented cylinders are also the only systems currently used with renewable energy supplies such as ground & air heat pumps and underfloor heating, due to their nature of being almost 100% energy efficient. This makes them even more of an important thing as households strive to become greener and save energy (as well as money!).

However despite these numerous advantages installers should still show great caution and care when dealing with unvented cylinders, as failing to properly install them is extremely dangerous. Unvented hot water systems usually operate above atmospheric pressure and unless the right measures are taken to prevent overheating, the results can be quite explosive to say the least. Just have a look at this video of what can happen if adequate checks and protection haven't been made:

VIEW ON YOUTUBE

But don't let this video put you off them. As long as they are installed correctly with all of the proper safety precautions in place unvented cylinders are perfectly safe. All plumbers handling unvented cylinders are required to be qualified in accordance with Part G of the Building Regulations, which can be achieved through the Access Training Academies Unvented Hot Water Cylinders course.

For more information on our Unvented course or our wider range of intensive plumbing courses, please take a look at the plumbing section linked on the left hand side of the page. Alternatively, you can speak to our course advice team to have any questions you may have answered personally - simply call 0800 345 7492 or fill in the information form provided on this website.