AquaSave

AquaSave turns a water-saving device into a DePIN node. The AquaBank unit sits in the hot-water pipe run and keeps already-heated water circulating, cutting boiler cycling and the direct discharge of cold pipe water; by project estimates it saves households and businesses about 24% on water and electricity bills. Installation needs no pipe rework, and after fitting, flow anomalies also surface leaks. The same hardware has sold for roughly a decade in a non-blockchain version from AquaReturn, onto which AquaSave added data signing and a reward layer.

Water temperature, flow and usage curves are signed locally and written on-chain, with users earning tokens for data contribution while utilities, water companies and building operators get verifiable consumption profiles. The project won the climate track at the 2024 Solana Renaissance hackathon and later moved from Solana to peaq, where devices and users each hold a self-sovereign identity. A pilot with Spain's Balearic Islands deployed 240 units, and German pump maker Wilo handles distribution across several countries.