Hi Michael, no need to change your fixings or hose. I used mine for a few years now and only when quite hot does it start to test the integrity of your couplings. Even then the normal microbore (yellow Gardiner hose for me) and pole hose is ok.
If your just taking the chill off , no problem at all. Ive had mine at 48 degrees and all was ok, the pipe just got a bit more 'stretchy'.