How many Solar Thermal panels are needed?
Even a small number of solar vacuum tubes will make a difference to your hot water heating requirements, regardless of cylinder size or demand. For small households, a single 20tube south facing panel should be sufficient. For larger households, a 30tube panel is a better option. For swimming pools, you should use 25-30% of the pools surface area (eg 4 panels for a 10x4m pool).
