Eric Aune walks through the radiant floor heating system installed in his Central Minnesota shop, breaking down how PEX tubing embedded in concrete creates a large radiant surface that emits heat energy rather than warming air directly. He covers the key components — a gas-fired condensing boiler, circulator pump, hydraulic separator, and expansion tank — and explains how outdoor reset controls water temperature based on real-time heat load. A propylene glycol-water mix protects the closed-loop system from freezing. Aune also touches on insulation requirements, loop layout, and why he staples tubing directly to foam rather than using panel systems.

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