An Overview about Hot Water Cylinders

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Many of you will agree on the fact that when householders decide on fitting the hot water cylinders into their home, they will also have to pay attention towards buying a cylinder that is vented or unvented. Actually selecting the one or the other is completely dependent up on whether they have direct or indirect system. These terms related to these devices and signifies how the mains water system is supplied – either directly connected to a pressure vessel that is placed inside the device or in an indirectly manner through a cold water storage tank. Majority of households utilise a combination of actually both types for indirect with common/normal heating procedure and an immersion heater used as back up or storage during hot water emergencies.

Actually the unvented devices were not permitted for domestic central heating systems. Only vented ones were allowed, this system has a vent pipe which is subjected to the atmospheric pressure. The mains liquid is directed to and stored in a big storage tank which is generally located in the loft and from there the liquid is fed to all the appliances inside your house. The appliances that require the hot liquid are served indirectly through the storage tank to these devices where it is heated by a heat exchanger. When the liquid supply is gravity fed and has low pressure then it is sometimes important to have a pump installed in order to maintain a strong liquid flow for both heating process as well as hot liquid usage.

These unvented devices work directly from the main liquid source. The liquid is boiled by an immersion heater instead of using a heat exchanger. And when the pressure comes directly from the mains liquid source the flow is actually much stronger. These systems are usually fitted with various safety triggers in order to help in minimizing the high pressure and expansion of the liquid. And here, one can locate the tank in the loft for venting and supply the central infrared heating as there is no requirement for a cold liquid storage tank.

Pro's and Con's of vented Systems:

One of the biggest advantages of these vented systems over the unvented variety is that they are very much convenient to install and maintain, lowering the price and the time required for servicing the system is also less.

And one of the biggest disadvantages with vented systems is that you will require more space in your house as you will require a cold storage tank for this.

Pro's and Con's of unvented systems:

The unvented devices produce hot water at mains pressure so there is no need to have cold storage tank and the extra pipe work is also not required to link it all up.


And one the biggest drawbacks of unvented systems are that you are limited to select your showers because some of the power showers and mixers cannot be used with these kinds of systems. They systems will also need a specialist in order to install the system properly thus making this method of hot water cylinders an expensive option.

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Dara Conor has 4 articles online

The article is written by Dara Conor who is known internet marketer and specialized in Garage Equipment, Air Tools, Air Compressors, Infrared Heating, Warehouse Heating and more.

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An Overview about Hot Water Cylinders

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An Overview about Hot Water Cylinders

This article was published on 2013/06/25