GoKawiilReddit modder vents PC heat outdoors with automated split water-cooling loop
A Reddit user known as Motor_Attention1865 built a PC water cooling system that routes coolant to an external 240mm radiator outside in winter, keeping excess heat from warming their heated-floor room. An Arduino Mega with temperature probes and a Python script controls a three-way valve, opening it to send coolant outdoors only when needed and keeping the coolant above the dew point to avoid condensation. The heavily watercooled PC itself includes a delidded Core Ultra 7 270K Plus, an RTX 4070 Ti Super, and watercooled RAM, alongside internal 120mm and 360mm radiators fed by an EK Kinetic D5 pump.
GoKawiil's interpretation of the reporting above, not reported fact.
The project illustrates how enthusiast PC builders are borrowing concepts from HVAC systems, like mini-split air conditioners, to solve real-world thermal management problems beyond typical case cooling. It suggests growing interest among extreme PC modders in automated, sensor-driven cooling solutions rather than manual adjustments like opening windows. Such DIY builds could inspire more hybrid indoor-outdoor cooling designs, though they remain niche due to their complexity and installation requirements.
- A Reddit modder built an automated system to vent PC heat to an outdoor radiator in winter.
- An Arduino Mega and Python script manage a three-way valve and dew-point-safe coolant temperatures.
- The PC itself features extensive internal watercooling, including a direct-die CPU block and watercooled RAM and GPU.
EKWB EK-Quantum Liquid Cooling Kit — If you're inspired by this kind of extreme watercooling project, a proper custom loop kit is the natural starting point before you get to Arduino-controlled external radiators. EKWB kits give you the pump, reservoir, tubing, and fittings needed to build a serious loop for high-end CPUs and GPUs like the ones in this build. It's a great way to dip into DIY liquid cooling before engineering your own mini-split PC chiller.
See EKWB EK-Quantum Liquid Cooling Kit on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: tomshardware.com — Jhet Borja, 2026-11-11
Published there as: “Modder routes PC water cooling loop to radiator outside to beat the winter heat”
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