What Are They

The Joule range of copper solar cylinders are a result of 12 months continous research and development. The cylinders differ from standard cylinders because of their unique solar coil. This coil has been designed to optimise the gain you will recieve from your solar system. The insulation has been applied to ensure that the cylinder holds it heat longer giving more hot water from the solar system. The important difference between a solar cylinder and a standard multi coil cylinder is the solar coil is located below all other coils giving the cylinder its dedicated solar volume storage. The Joule cylinder's solar coil exact location is a result of months of testing to determine the correct solar storage for each different size cylinder. As northern europe has little solar gain during winter months the solar cylinder must allow for sufficient hot water when relying on your home heating boielr or electrical immersion. It is with all these advantages it is no wodner that the Joule Vented Copper Solar Cylinder is an ideal match to what ever solar package you have. The other great advantage about sourcing your high efficiency solar cylinder from Joule is we will make the cylinder to your exact specification if required. Just contact us with your requirements and we will be happy to advise.

Available Sizes




When & Where Should They Be Used
Our twin coil and triple coil solar cylinders are specifically designed to work in conjunction with the domestic heating system. Our solar cylinders are manufactured with either twin or triple independent coils. One or two coils are designed to transfer heat from an independent heating source, (eg. transferring heat from a central heating boiler or solid fuel boiler to the water in the solar cylinder) and the solar coil, which is manufactured from high efficiency finned tube with a large surface area, to transfer heat from the solar panels into the solar hot water cylinder.

The boiler coil which (if fitted) is manufactured to BS 1566, can also be supplied as high recovery to reduce boiler cycling. Cylinder connection sizes can be specified as 22mm or 28mm compression. The high efficiency solar coil is fitted with 15mm or 22mm compression and with all connections protruding beyond the insulation. This makes our twin or triple coil solar cylinder one of the most efficient manufactured in Ireland.

The cylinders are available in three grades - Grade 1, Grade 2, & Grade 3, with grade 3 generally being selected for normal domestic use. Grades 1 & 2 are made from heavier material and are most often used where there is a greater working head of water or where improved durability is required.

Alternative heights and diameters are also available in our range of solar cylinders where space and water volumes are at a premium. In general, solar cylinders are sized to suit the number of house holders and the solar thermal panel surface area.


Engineering Specification
The copper solar cylinder must be manufactured with a high recovery solar coil located below the level of the alternative heating coils and elements. The cylinder must be insulated with 50mm factory applied green foam insulation. The cylinder must have 28mm high gain solar coil. All other additional heat source coils must be manufactured using 28mm coil also. The feed and expansionmust be 28mm female. An immersion must be fitted on the dome with an dual element no shorter than 24". The coils must be terminated using 28mm male bosses. The bosses must be extra long no shorter than 150mm to allow easy connection through thicker insulation. The cylinder must be include 2 no. PT1000 solar stat pockets. These stat pockets should be no greater than 10mm in diameter. One should be located at the top of the cylinder at top of sheet but below the dome. The second PT1000 stat pocket must be located 2/3 up from the bottom connection of solar coil to the top connection of the solar coil. The cylinder should include 1 no. 1/2" stat pocket located 2/3 up from the bottom connection of the boiler coil to the top connection of the boiler coil. The cylinder shall come complete with individual serial number and barcode printed on label. It should also come with commissioning certificate which shall be completed by installer after installation.