Or, Alice's Adventures in Salvageland
We picked up a recycled RV water tank that we'll use for our grey water tank. We found it at a great surplus place here in Phoenix. Arizona RV Salvage. You should definitely check them out if you're building your own tiny house, they have a huge lot and several buildings packed with salvaged recreational vehicles and parts from those already disassembled. They gave us a great deal on a bunch of essential tiny house bits! We got the grey water tank, a NEW 3 gallon per minute 115V water pump, a valve for the grey water drain, and a nifty electronic display that will show us our water tank levels.
The opening in our floor in between two of the steel cross struts is 72" long x 30.5" wide x 10" high. Our goal was to find a tank that would fit in there that was our target size of greater than 40 gallons. This one is 62” long x 23” wide x 9” high and holds about 50 gallons. This is a great fit in the floor opening and allows room on the sides and ends for fittings and insulation.