{"product_id":"antminer-s21-hydro-miner-water-cooling-heatsink","title":"Antminer S21 Hydro Miner Water Cooling Heatsink Kit","description":"\u003ch2\u003eAntminer S21 Hydro Miner Water Cooling Heatsink Plate – Upgrade Miner Efficiency\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAntminer S21 Hydro Water Cooling Heatsink Plate\u003c\/strong\u003e is the \u003cstrong\u003ecold plate that bonds directly to the BM1370 ASIC chips\u003c\/strong\u003e on an S21 Hydro hashboard and transfers heat into the coolant loop. It replaces the original S21 Hydro plate when the OEM unit develops a leak, the gasket fails, the threaded fittings strip, or the bonded interface separates from the chips after a thermal event. With a fresh, properly seated cooling plate the miner returns to its rated \u003cstrong\u003e335 TH\/s\u003c\/strong\u003e hashrate at the expected coolant return temperature, instead of throttling or shutting down on chip-overtemp errors.\u003c\/p\u003e\n\u003ch3\u003eWhy the Cooling Plate Matters\u003c\/h3\u003e\n\u003cp\u003eThe S21 Hydro design relies on the cooling plate to keep BM1370 junction temperatures inside Bitmain's spec window across the whole hashboard. Even a small degradation of the thermal interface — a hairline crack, dried-out paste, partial delamination — raises the temperature gradient between chip and coolant by a few degrees, which trips the miner's thermal-protection logic and either underclocks the board or shuts it down. Operators running S21 Hydro fleets see this most often after a coolant-leak repair (the plate was disturbed) or after a long run without a coolant flush.\u003c\/p\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003ePower off the miner, isolate from mains, and drain or isolate the coolant loop on the affected hashboard. Remove the old cooling plate by undoing the threaded fittings and the chip-side fasteners — collect any residual coolant. Clean both the chip array and the new plate's mating surface with isopropyl alcohol, apply a thin even layer of high-conductivity thermal compound, and reseat the new plate using fresh gaskets. Torque the fittings to spec, refill \/ pressure-test the loop for leaks before powering up the miner, and verify hashboard temperatures sit in the OEM range under full load.\u003c\/p\u003e\n\u003ch4\u003eAntminer S21 Hydro Cooling Plate Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCompatible Miner\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eAntminer S21 Hydro (BM1370 hashboards)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eFunction\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCold-plate heat exchanger between ASIC chips and coolant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eHigh-conductivity copper \/ aluminium plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eFittings\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eThreaded coolant inlet \/ outlet, S21 Hydro spec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eRecommended TIM\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eHigh-conductivity thermal paste \/ gel (8-10W\/m·K)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eUse Case\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eReplacement after leak \/ damage \/ thermal degradation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003ePressure Test\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eRequired before re-energising hashboard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eRelated Hydro Cooling Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/antminer-s21-t21-water-cooling-plate-asic-hydro-heatsink\"\u003eAntminer S21 \/ T21 Water Cooling Plate\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/lianli-12kw-water-cooling-kit-hydro-asic-whatsminer-antminer-cryptominer\"\u003eLian Li 12KW Water Cooling Kit – Hydro ASIC\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/dowsil-8w-blue-thermal-gel-1kg-asic-miner-hashboards\"\u003eDOWSIL TC-3080 8W\/mK Blue Thermal Gel (1kg)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/antminer-hydro-psu-cable-power-bitmain-apw11-power-supply\"\u003eAntminer Hydro PSU Cable – APW11 \/ S21 Hydro\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRefurbishing S21 Hydro hashboards in volume? \u003ca href=\"mailto:contact@lys-sz.com\"\u003eContact us at contact@lys-sz.com\u003c\/a\u003e for fleet-quantity pricing. Worldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":43463224590515,"sku":null,"price":154.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/Antminer-S21-T21-Water-Cooling-Plate-ASIC-Hydro-Heatsink-Mining-Performance_2_79ebe8d8-42e6-4c99-92e2-d633cbfe8122.webp?v=1745886793","url":"https:\/\/lys-sz.com\/products\/antminer-s21-hydro-miner-water-cooling-heatsink","provider":"LYS Shenzhen","version":"1.0","type":"link"}