 
            
Features a metal coil (copper or stainless) inside a tank or boiler
Cold water flows through the coil, heating indirectly by hot fluid—no mixing
Offers on-demand or stored hot water, ideal with boilers, solar, or heat pumps
💧 Fast heating, 🛠️ replaceable coil, and ✅ long-lasting operation
⚠️ Requires periodic descaling for optimal efficiency
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