Simple cost and payback calculator
Use tariff details carefully
Some utilities charge water and sewer together; others do not reduce sewer charges when rainwater replaces mains water. Fixed charges usually remain.
Simple payback is incomplete
The model excludes financing, pump electricity, major repairs, inflation, changing tariffs, property value, environmental benefits and stormwater fees or credits.
Planning estimate only: Verify local rainfall, product ratings, structural support, overflow, plumbing, water-quality and permit requirements.