This is an ideal system for a small footprint and low demand. The water can be used to flush toilets and run a few hoses. This water can be further filtered and treated for use in showers and sinks.
- What is the size of the collection roof?
- How many fixtures will need to operate?
- Does the water need to be potable?
- Will the tank be above or below ground?
- Will the system be susceptible to freezing?
This is a typical example, but other options are available.