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Post date: Dec 19, 2014 10:20:57 PM
Most of us don't think about plumbing in the garage. But with the rainwater storage in the garage, plus the water softener and tankless water heater (one of two — the other is for the bathroom), I thought I would see just how complicated it might become.
What I show (at left) is the garage floor plan. [You can double-click the drawing to enlarge it.]
The door at the upper right (northeast) goes into the house via the mud room. At the bottom (south) are two water tanks, each 310 gallons, which flank the window. Rainwater comes from the middle of the roof via a 3" diameter pipe in the ceiling that originates (off screen) above the wall between the kitchen and the living room.
The first gallon or so of rainwater contains bird droppings and dust, so it is diverted into the sewer. The rest of the water flows into the top of the tanks.
Also on the wall between the garage and the kitchen are the water softener and the tankless water heater (labeled "WH") - which needs a vent to the outdoors through the wall.
The water storage tanks each need a 2" overflow and a way to deliver the stored water to the garden drip irrigation system.
Much of this is more clearly shown by looking at elevation drawings of the walls, as shown above.
The upper left of this drawing shows the East wall, the one that adjoins the house living space, in particular, the kitchen. The mud room in behind the pink door on the left, with the garage door opener overhead.
Rainwater enters the garage through a 3" pipe from the roof drain, flows through the "First Flush" diverter, and into the tanks on the right (south). There is also a city water supply, in case the tank runs dry.
Adjacent to the tank is the water heater and the water softener, with a drain between them. The salt water from recharging the water softener, as well as the dirty rain water diverted from the roof, goes into this sewer, which goes into the wall to join the sewer main under the kitchen sink.
Between the two tanks, best seen in the South elevation, are the inlet for the second tank (right), the 2" overflow pipes, and the 1" drain from the tanks to the irrigation system, exiting through the south wall.
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