Steal this idea... please!

First some definitions:

Freshwater (also called potable or drinking water) Water that comes out of your taps at home.

Graywater (also called sullage) Non-industrial waste-water generated from domestic processes such as dish washing, laundry and bathing.

Blackwater (also called sewage) Water that is flushed down the toilet containing, well, you know what it contains.

Here's the deal.  Unless you have one of these nifty instant-on natural gas-powered hot water heaters installed on every tap in your home, every single time you turn on the water to do dishes, wash your face or take a shower/bath, you end up letting the water run for anywhere from a few seconds to a minute or more, until it reaches the desired temperature.

Think about that for a moment.  Imagine the staggering amount of perfectly clean drinking-quality water that is wasted down the drain as graywater (but which doesn't contain any of the soaps, food particles or other chemical contaminants that make untreated graywater unusable), while you stand there with your finger in the too-cold or too-warm water stream.  Worse yet, most graywater ends up joining blackwater in the house sewage lines and is, therefore, completely lost even for municipal re-use.

So here's my idea (actually a two-part idea):

1. In existing homes, a valve could be retrofitted near all sinks and tubs/showers that would allow those wasted seconds/minutes of water (when you are waiting for the temperature to warm up/cool down) to be channeled into a central holding tank somewhere in the house.  Once the water reaches the desired temperature the user would turn the valve, sending all subsequent water into the house sewer outlet line.  This holding tank that received the first few seconds, or minutes, of perfectly usable water would then become the sole source for refilling the house's toilet tanks after each flush. In the rare event that this holding tank ran low, an automatic level sensor or float switch could top it off from the house's freshwater supply.

2. In new construction homes, the above should be installed as a standard (required) part of the plumbing system, but with a larger storage tank and more extensive piping that would allow this wasted (but not waste) water to also be used for lawn/garden irrigation and water-intensive outdoor tasks such as car-washing.

Not only would these systems dramatically reduce water wastage (through diversion and instant reclamation of clean water), but it would allow toilets and irrigation systems (two major water consumers in the typical home) to be operated with 0 impact on the household water bill.

This also means that homes using this system could apply for and receive blanket exemptions from municipalities in areas where car washing and lawn-watering are severely limited, or even banned, during seasonal droughts.

So go ahead, steal my idea.  Please!  I don't want a dime.

Just let me know when a commercial system goes on sale so I can have it installed it in my home.