Recycle water from your morning shower
I just came across this Canadian invention that lets you reuse the thermal energy from your shower. The great thing about is that is so simple and it is has no moving parts meaning no energy consumption. The downside is that it has to be build in with your drain. This is on my list for my future house. Check it out at http://www.ecodrain.ca/
The cold water that you usually mix with the hot water gets heated by the used water. This increases the efficiency of the water heater by 25%-40%, says ecodrain.
