Alex made a reply to someone on another forum with a very detailed explanation as to why their minibore hose didn't handle hot as well as cold.
He said that they have never recommended standard Minibore or Microbore for Hot Water Systems. Whilst some clients can 'get away' with using it, a lot depends on the temperature used. Many Hot Water users regularly have 70°going into the reel which then increases the strain that standard hose is under -The initial purge of water on some systems can even be up to 90°. On the other hand some users only use about 30-40° which has a dramatically different effect on the hose.
Alex also says that their Microbore is actually tougher than the new slimline Minibore, but they stilll do not recommend it with hot water.
I have recently replaced my old hose bought from Cleantech 5 years ago with some from Gardiners.
The cleantech hose was very much stiffer than this new hose from Gardiners.
With the original hose there was usually a delay when my Varistream activated the pump after the tap was opened. Now the hose, being a little more flexible swells a bit with the pressure, and so I no longer get that delay as the hose acts as a reservoir.
At first I wasn't too sure, but now I find the hose great for cold water.
From the other posts on the subject of late, I think the majority of hot water users use microbore.
Spruce
original post edited later