220V 1P 3KW PFA Inline Heater & 10" PFA Filter Housing Overview PFA in-line heater are desinged for hydrofluoric acid (HF), potassium hydroxide (KOH), and other chemistry compatible with PFA. These PFA heaters push widely accepted high-purity materials to operating extremes while maximizing performance and reliability. We has once again taken heating of high-purity liquids to a new level of performance and reliability. We has once again taken heating of high purity liquids to