This is a new idea to be included in the A+House. It´s just about saving energy. The main idea, is that if we preheat water before it enters into the boiler, we save energy. With this concept I have developed some ideas:

1.- Place a tank inside the house, that will supply the boiler. Normally cold water enters the house below 59ºF. Inside the house, normal temperature is about, 71ºF. If we place this tank inside the house, water will reach 71ºF temperature, what mean that the boiler will work less, saving energy.

2.- A smart drain, conected to two different draining tubes.

When the water in the shower is hot, the smart drain will connect the tube that will preheat the tank I said before. In this way we will use the termic energy included in the water. Once the water has passed the tank, it will pass a filter and ther fill another tank for gardening or cleanning use.

When the water is cold, the smart drain connects with the filter that fills the tank for further use (gardening or cleaning)

This drain will work automatically, by a termic sensor that will make it turn a device, in order to connect to one or another drainning tube.