Reservoir designs heat pump water heaters that learn household hot-water usage patterns to heat at the most efficient times and store energy as hot water. Its products include ultrasonic flow sensors for leak detection, and a “Max” model with recirculation and mixing valves for instant hot water and freeze protection. The company has installed about 100 units and targets around 1,000 installations by the end of next year; management says that scale would enable neighborhood-level grid relief and participation in utility demand response. Pricing is positioned to be competitive: the Core model sells for $5,000 (installation included) and the Max for $6,500, with Massachusetts rebates (about $1,050) reducing effective customer cost; Reservoir projects typical Boston homeowners could save up to $1,000 per year in energy costs. The company offers a 10-year warranty and has started its own plumbing arm to streamline deployment and sales.

Total raised

$8M

Funding rounds

1

Latest round

Seed

Latest activity

Aug 2026