Wash my hands, turn on the hot water, cold water ok. I'll wait...waiting...waiting...waiting...still cold water...1 minute later I just gave up. So I wash my hands with cold water.
Taking a shower is even more of an excruciating experience. First, waiting for the hot water, then getting a blast of cold water during the middle of a hot shower...then back to hot. Turning off the water during the middle of a shower is a bad idea....wait for the hot water again, oh another blast of cold water.
Not impressed with this technology at the moment. Perhaps you have to get into the high-end-very expensive units...I dunno. What you save in energy, you burn a lot in water consumption. I probably used double the amount of water to shower and triple the amount for washing my hands.
Iím armed and Iím drinking. You donít want to listen to advice from me, amigo.