Hot water installer: Hello, can I help you?
Me: Yes, my water-saving shower head doesn't seem to be drawing enough water to trigger our brand new instant hot water service to turn on. This morning I had to fill a bucket in the bath at the same time as having my shower just to get hot water in the shower.
HWI: Yes, that is a common issue. You will need to buy a non-water-saving shower head.
Me: Isn't that ironic, that in order to use an energy efficient hot water system we cannot use a water-saving shower head.
HWI: Fortunately the hot water system is already designed to save water.
Me: (to myself) Not sure how they figure that one.
So we will be taking the non-water-saving head from our ensuite which is currently under renovations (read: all the tiles fell in on me while I was having a shower) and I will be able to have a shower without wasting water in the bathtub. Hooray.