20 tube solar panel - high efficiency 47mm Ø double wall evacuated tube solar collector. includes: 20 bottom rail mounted tube cups, 1 tube of heat conducting paste, 2 side rails, 1 bottom rail and 1 set of nuts, bolts and washers for assembly
On a south-facing roof with a short pipe run, this panel is ideal for heating water in our 90 to 150litre twin coil cylinders. On east/west facing roofs, two of these panels would be required (one on either side).
The SFB panel is the best choice for the UK. The panel is considered to be one of the most cost-effective on the market, and performs extremely well in the UK climate. Its slimline design suits UK architecture, and in most cases, it should be considered 'permitted development' - meaning that you do not need to apply for planning permission if you wish to fit these panels to your roof. The SFB panel has a very low heat capacity, containing only 1 - 1.5litres of water inside the manifold. This allows the panel to heat up quickly when the sun starts to shine, and minimises heat losses at night. It is also much lighter than the integrated tank designs (Navitron SFA and SFD panels), making it much more suitable for load-bearing roof timbers. It should provide you with free hot water for at least 6 months of the year and will strongly contribute thereafter.