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OSO Solarcyl cylinder [Enlarge] [More photos]

OSO Solarcyl Selection & sizing guide including orientation
The capacity of the cylinder on a solar installation must be based not just on the size of the cylinder but also on the amount of hot water required from the cylinder when the solar gain is very low.
 
It is generally recognised that fitting a larger capacity cylinder than would normally be the case in a conventional hot water system will, over the course of a year, increase the solar efficiency of the cylinder. A large cylinder that heats up fully during a day with high solar radiation, may well, dependant upon individual hot water demands, provide hot water well into the following day without alternative energy sources being deployed.
 
Bubble top or Fully flooded: The Solarcyl is supplied as standard as a bubble top (BT* with internal air gap expansion) unvented cylinder, meaning that no separate expansion vessel is required and space savings can be made. However in most installations, Oso recommend that Solarcyls are fitted as fully flooded cylinders (FF** separate expansion vessel required).
 
Fully flooded units offer a superior hot water performance when solar gain is low. As a general rule, OSO would recommend that Solarcyls are fitted using the fully flooded option as a greater amount of usable hot water from the upper heating coil is available. The installation of any unvented hot water storage system must comply with the current building regulations and approved document G3. The system must also be installed in accordance with the water regulations giving due care and attention to the design requirements of BS6700:2006 and BS EN 806-1:2000. Consideration should also be given to whether a direct cylinder is connected to an off-peak tariff, if so, the larger of the two capacities should be considered.