A modified Shanhuchong Y-160 aquarium chiller replaces its limited temperature controller with a Wi‑Fi Elitech ECS-974T. The upgrade adds twin probes to monitor the chilled water tank directly, and it enables remote monitoring and control through Home Assistan
A thriving aquarium doesn’t forgive guesswork. Salinity and temperature have to land in the narrow zone each species needs, and for tanks that rely on cooler water, a chiller becomes non-negotiable.
One hobbyist recently decided that the standard approach wasn’t precise enough—and rewired an aquarium-focused chiller to prove it. The target was a generic Shanhuchong Y-160 chiller. After a brief teardown. it turned out to be built around an STC-1000 style controller. a setup the modifier describes as coming with a practical limitation: it monitors only one temperature probe. tracking the temperature of the heat exchanger rather than the chilled water tank.
That difference matters when the real goal is stable conditions in the tank. So the controller was swapped out. The replacement was a Wi‑Fi-equipped Elitech ECS-974T, bought for $50 off AliExpress. It fits the same 71 x 29 mm form factor, keeping the transplant straightforward.
From there. the job moved into “creative rewiring.” The project uses the existing wiring layout as a guide. adds a new configuration. and then installs the twin temperature probes that come with the ECS-974T. With both probes in place. the controller can monitor not just the heat exchanger temperature. but also the chilled water tank—adding redundancy that the hobbyist says feels especially valuable after spending “thousands of clams” on a fancy aquarium and its inhabitants.
The Wi‑Fi piece is where the upgrade starts to feel less like tinkering and more like daily convenience. Remote monitoring and control are possible. and the modifier pushed a Home Assistant configuration update in a PR that has since been merged. The author also credits Elitech for documentation that was “pretty good. ” saying it helped create the Home Assistant configuration file—something they describe as rare with many similar controllers.
In one small hardware change, the aquarium now has a controller that watches the water it actually cares about, not just the part it happens to pass through. And with Wi‑Fi access and a working Home Assistant setup, it’s also easier to keep that temperature stable without standing over the tank.
aquarium chiller Elitech ECS-974T Shanhuchong Y-160 STC-1000 Home Assistant Wi-Fi temperature controller AliExpress temperature probes IoT DIY electronics