Just a thought, ionics recently brought out a new brush for hot water, which doesn't curl up. They also stock a different thermo hose. It is full size though. I would wait and see if your current hose stands up to it.
I recently bought an addis yard brush, same as normal house brush but a bit too stiff. At 4 quid it might be worth trying if it softens up with the hot as its very light.