304 Stainless Steel Filter Element Made of 304 stainless steel, this filter element provides durable, longlasting filtration for your heater system and resists rust. Heater Prefilter Specifically designed for heater systems, this prefilter removes sediment, rust, and other impurities. By capturing these particles, it protects the heater and extends its lifespan, helping maintain performance. For Heater System Tailored to fit heater systems, this filter ensures compatibility and reliable operation. It efficiently filters impurities, delivering clean and safe water to your heater system. Use scenarios Residential hot water heater maintenance: install to reduce sediment buildup and protect the heater from particulate contamination. Commercial boiler or radiant heating system: use as a prefilter to maintain efficiency and extend equipment life by removing debris. Spa, pool, or outdoor heater filtration: fits heater setups to ensure clean water input and protect sensitive heating equipment.