WaterPlus technology: up to 16 % more hot water available Compliant with top ESWH regulations External temperature setting. Double safety thermostat Robust insulation material (polyurethane). Magnesium anode to fight corrosionHigh quality titanium enameled tank Designed in Italy. Modern shape with “Ariston wave”. User-friendly interface with heating feedback High efficiency with expanded polyurethane insulation Glasslined inner tank. Oversized magnesium anode PRO1 R is a medium capacity wall-mounted electric water heater capable of delivering more hot water, compared to other traditional water heaters. Product tested to the highest quality standard