Designed for low to medium flow point-of-use applications, the compact Mini™ series of tankless water heaters by Stiebel Eltron (6.5” tall x 7.5” wide x 3.25” deep) only weighs 3.5 lbs. and can fit in almost anywhere. There are three models in the series, the Mini 3, 4 and 6, which can provide 3 kW, 4 kW and 6 kW of power, respectively. The rugged, reliable Mini body is made of fiberglass-reinforced high-temperature plastic, and the housing consists of durable polycarbonate plastic.