Quote Originally Posted by r.bartlett View Post
This is how splits come from the factory, both pipes in the same lagging..

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That (very) small run is going to do very little damage to the efficiency of the system; 8 metres, on the other hand, is going to have a big effect on the efficiency of the system. For any installer to install a system and insulate both lines together shows a complete lack of knowledge of how the system actually works... I'm guessing the installer of that 8m pipe run system is a plumber.