Evacuated Tubes
This type of solar thermal collector is made up of many thin tubes that carry transfer fluid, which is used to heat the water. These systems, overall, are very efficient but are not so efficient in warmer months because they risk overheating. These are the type of panels that you may have seen on buildings if you’ve been on holiday to Greece, Turkey or Spain as they’re very popular in those countries. However, they aren’t as popular in the UK as they’re not so aesthetically pleasing.