Help & Advice for Specifers

I have a project in which I intend to use a hot water storage cylinder heated by an immersion heater. Do your cylinders come with an immersion heater already fitted or does this have to be bought and installed separately?

Our advanced product ranges are supplied with the appropriate type of immersion heater. We do not supply immersion heaters with standard domestic vented cylinders. Please contact us for further information on immersion heater options and their effect on heat up time for the end user.

Building Control is asking for the standing heat losses for the cylinder I’m installing. Can you provide that?

Yes, contact us directly with the capacity, model and specification of your cylinder and we’ll provide you with the standing heat loss per day specific to the cylinder being installed.

We need to provide an eco-homes assessment and need to know if your products are insulated using zero depletion potential (ODP) and have a global warming potential (GWP) of less than 5?

All our insulating products are ODP and they have a GWP index of less than 5.

I look after a large block of flats where your cylinders are installed. Under the insurance recommendations each resident needs to have these serviced, do you have any recommendations as to where we can get this arranged?

Building Regulations require that unvented (mains pressure) cylinders be fitted by a ‘competent’ person i.e. someone who holds a recognised certificate in the installation and maintenance of unvented (mains pressure) cylinders. Aside from the effect on the warranty, installation by a non-competent person can lead to problems with the safe and efficient running of the cylinder. It is also a requirement that the cylinder be serviced annually.

What grade of cylinder do I need?

Copper Industries manufacture our copper cylinders in the 3 grades described in BS 1566; Grade 1, Grade 2 and Grade 3. The cylinders are graded depending on the thickness of material used to cope with different operating conditions. Grade 3 cylinders are made from 0.7 – 1.2 mm thick copper and are designed to cope with a maximum working head of 10 metres.

Copper Industries only recommend this grade of cylinder operating within the stated parameters and connected to a reservoir or similar high quality water supply. Grade 2 cylinders are slightly thicker (0.9 – 1.4 mm) and are designed to work with a maximum working head of 15 metres. A Grade 2 cylinder would be recommended for most vented installations.

Finally, Grade 1 cylinders have the highest material thickness (1.2 – 2.0 mm) and are designed to work with pressurized systems which have a maximum working head of up to and including 25 metres. Sacrificial anodes are also available for hard water areas.

CAUTION: not all cylinder manufacturers classify their cylinders in the same way. If in doubt contact us directly.

What is the difference between a vented and unvented cylinder?

A vented cylinder is serviced from a feed and expansion (F&E) tank typically sited in the roof space above the cylinder. As water is drawn from the cylinder it is replaced by water from the F&E tank. When the water in the cylinder is heated it expands and this expansion is taken up and into the F&E tank.

An unvented cylinder is typically fed from the cold mains. On unvented cylinders the dynamics of expansion and contraction of the water as it heats and cools are controlled by an expansion vessel fitted to the cylinder. Unvented cylinders are designed to work with hot water under pressure and are subject to Building Regulations governing the installation and maintenance of the cylinder.

Can I install an unvented cylinder in an apartment?

Technically yes but it is not always practical and depends on the incoming mains water pressure available in each case. If the mains water pressure is low we would recommend one of the cylinders from our combination unit range.

What is the difference between a thermal store and other cylinders?

The traditional hot water cylinder, the type most of us are familiar with, uses an energy source to heat the water in the cylinder which is drawn off to feed the hot water taps and appliances.

In a Thermal store the body of water in the cylinder is heated in a similar fashion but instead of the store water being used, cold water from the mains supply is passed through a coil inside the cylinder. Heat from the store is transferred to the water as passes through the coil. The water from the coil is then cooled to a safe useable temperature by blending with cold water before being supplied to the hot water taps and appliances in the system.

The principle advantage of a Thermal store is the provision of hot water at mains pressure without using a mains pressure cylinder to a maximum of 3 bar.

Thermal stores are increasingly the cylinder of choice in flats and small apartments or installations where multiple heat sources are used. For more information on the MaxiPod please visit our MaxiPod page [Link] and watch the animations.