Evacuated Tube solar collectors are on average around 30% more efficient than flat plate solar thermal panels. This allows them to produce the same amount of hot water with a system that takes up less space, Ideal for homes that don’t have a large area of flat roof space.
A potential downside of using evacuated tubes is the larger amount of glass means that they can potentially be more vulnerable to damage.
Flat Plate solar thermal panels also tend to cost less, and their studier design makes them less likely to be damaged than evacuated tubes. The reduced efficiency can be made up for by installing more solar thermal panels if you have the roof space available.
Overall, evacuated tube solar collectors have become more popular due to their superior efficiency in retaining heat, an important benefit in lower temperatures which makes them ideal for the Irish climate.