SOLNAT is a natural circulation solar collector. The collector's design maximizes heat gain and minimizes heat loss. The SOLNAT natural circulation kit offers a compact solution for using the sun's renewable energy to produce domestic hot water in single-family homes. The solar collector's design and optimized internal geometry ensure maximum heat gain and minimize heat loss. The 50 mm thick thermal insulation of the boiler, made from CFC-free, high-density polyurethane foam, ensures hot water even in winter. The tank is protected from electrolysis by a magnesium anode to ensure a long life.