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:
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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.
With the planned building of millions of new homes across the UK well underway, many are also expecting a rise in new buyers over the next few years as Britain enjoys a well-needed construction boom.
With this in mind, OFTEC - the group responsible for maintaining standards across the domestic oil heating and cooking industry, is offering some practical advice to those first-time buyers who may soon begin their search for the perfect home. This advice isn't just aimed at buyers of brand new homes either - it's especially geared toward those who may take on an existing home and not know what to look for in terms of their heating/hot water systems. Heating problems may be difficult to spot with the naked eye, especially to someone who hasn't done a plumbing training course or extensive gas training, but OFTEC offer these handy bits of advice to make sure you can walk into your new home with both buyer's satisfaction and peace of mind.
Be sure to check the boiler
Has it has had any problems in the past? When was the last time it was serviced? Boilers should be serviced annually for a number of reasons, mainly to make sure that is running efficiently and more importantly safely. If you are really unsure, it might be worth asking the current homeowner if you can have it looked at beforehand by a professional gas engineer.
Check the Energy Performance Certificate (EPC)
These give potential buyers valuable information about the property's typical energy usage and costs. An EPC grades the property’s energy efficiency from A to G and contains two particularly important areas - current features and recommendations for improving the home. The current features section lists the most significant energy-related features of the property and gives them a star rating based on cost. The recommendations give more information about each energy efficiency measure recommended and explains in general terms how it would improve the energy efficiency of the home.
How much do you know about the hot water system?
How is it heated? It might be worth checking the water pressure to make sure it is all up to scratch.
Know the warning signs
Occurances such as stained/smoke damaged areas around the boiler and flue are not to be ignored and should be treated VERY seriously. If any properties you view have these, make sure that a registered gas safe engineer doesn't just look at them for your safety - but also for the safety of the current homeowners. Other telltale signs of bad maintenance include leaks and staining on carpets near radiators.
Getting the house properly checked
OFTEC recommend getting valuations, an RICS homebuyer’s report or even a full structural survey. The valuation carried out by a mortgage company is not a survey, and will not inform you if there are any defects that materially affect the property’s value.
However the most important thing OFTEC recommend is trusting your instinct. if you think there is something wrong with the property, then don't just discard those feelings. However if you get a good feeling this may be the house for you - minor problems can easily fixed by competent tradespeople, but be sure to make sure the costs aren't racking up before you've even moved in!