Eric Aune, a Minnesota master plumber, walks through the Grundfos Alpha Comfort hot water recirculation system — a retrofit solution designed to eliminate the wait for hot water in existing homes. The system pairs a small, energy-efficient ECM pump (installed at the water heater) with a thermostatic crossover valve placed under a sink. Together, they circulate hot water through the supply lines, briefly using the cold line as a return path. The pump includes built-in controls for scheduling, auto-learning usage patterns, and even a dedicated heat pump water heater mode, all manageable through a free app.

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