Homeowner Assistance


We at Newark Copper Cylinder deal with a wide variety of people such as plumbers, building contractors, housing organisations, architects, system designers and engineers. We endeavour to make our website as information rich and technical as possible as to cater to these specific needs however we understand that to the everyday homeowner this information can be overwhelming, therefore we have created this guide to assist you in finding your unique requirements.


Step 1 – Height and Width Restrictions


To find the optimal size cylinder, we first need to determine the space available. The volume of water available is determined from a unit’s height and diameter however due to recent legislation changes, all units must be sold insulated as to reduce the amount of heat lost from an at temperature tank. As more insulation is required for a larger volume of water, this can cause the overall dimensions of the tank to increase exponentially.


When adjusting for insulation, remember that the insulation applied will double as it is applied on all sides of the cylinder as explained by the image



Step 2 – Cylinder Requirements








Direct –

If a cylinder is on direct it is usually heated by immersion heaters however


















Indirect –

If your heating system uses a gas boiler, then the cylinder will be indirect as it will have to have an internal coil to keep the

potable water and the water through the boiler separate.




















If there is not sufficient space to store a feed and expansion tank in the loft, then a combination tank can alleviate this

issue by offering a built-in expansion tank onto the unit.
























Thermal Store-

A Thermalstore unit is designed to store water at a higher temperature than normal,












Vented –

A vented cylinder is open to the air and therefo


Unvented –

An unvented cylinder is made from a thicker material or from stainless steel allowing it to withstand higher pressures therefore being able to utilise the mains water pressure. This allows for high pressure water for power showers etc. As unvented cylinders operate at higher pressures, it is important that the unit is installed and commissioned by  someone with the appripriate qualifications to do so.


Material –

For vented cylinders, we would recommend copper due to it’s resistance to corrosion and flexibility however as copper is a weaker material than stainless steel then thicker copper must be used resulting in higher costs, therefore we would recommend stainless steel for unvented cylinders.


Step 3 – Extra Requirements

If the cylinder will be used in conjunction with an uncontrolled heat source such as a wood burner, pellet burner, boat engine etc. then the cylinder will need an additional ½” Female connection for a Temperature Relief Valve.


If your system utilises solar panels or a heat pump, these can be used to heat the cylinder on a separate coil made from finned copper tube for a higher surface area. It is important that the water from these sources and the water inside the tank is kept separate as these sources may require system additives which can contaminate the potable water.


If you have the space available, it may be wise to opt for thicker insulation; thicker insulation will result in a lower heat loss and therefore less energy will be wasted resulting in lower energy bills long-term.


Step 4 – Measurement

If you are wishing to replace an old cylinder, we can make a 1:1 replica of the unit however we will need as much information as possible.


Cylinder Size –

If the cylinder is insulated, it can be quite difficult to determine what the size of the unit is under the insulation. The easiest method is to insert a sharp object such as a screwdriver or a knife into the foam and measure its depth, then measure the overall diameter of the unit. Multiply the foam depth by 2 and negate that from the overall diameter, this will leave you with the physical size of the tank.

When measuring the fittings, the easiest method is to measure all fittings from the ground to the fitting centre. Fittings are usually placed within one third of the unit for easy access however this is not always the case, when describing the fitting positions, they are best described using a clock face position such as the coil being at 3 o’clock and the cold feed being at 9 o’clock.


Depending on the space available, it may be necessary for the cylinder to be positioned in a horizontal orientation; this can be specially designed to have a dome on either end and the unit to be sat on a pair of cradles.


Although we manufacture all our units by hand and we try to be as flexible as possible, there are limits to what we can achieve; the tallest unit we can make is around 2300mm and the largest diameter we can do is around 1050mm as this is the maximum size we can fit in the insulation spray booth.


As the tops and bottoms of the unit are domed they have to be spun from sheet metal and there are only certain sizes available with the smallest being 150mm.




























Copyright Newark Copper Cylinder Ltd. 1977-2013 All Rights Reserved


Newark Copper Cylinder Co. Ltd.

Brunel Drive

Northern Road Industrial Estate



NG24 2EG


Tel: 01636 678 437

Fax: 01636 678 964