The FERNOX FI Sigma Filter Set Cleaner and Inhibitor is a 500ml solution designed for indoor use with a 240V power source. Specifically formulated for hydronic (hot water) heating systems, this boiler cleaner is ideal for maintaining the efficiency of storage tank water heaters. With an energy efficiency rating of A and a first-hour recovery rate of 204 litres per hour, this product effectively removes limescale build-up and protects against corrosion, ensuring optimal performance from your heating system.
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