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For this solution, we are using a Sonoff SV controller. This is a nice controller since it has everything we need to control the heater's remote relays. Additionally, we can power it from the heater itself since it accepts 5-24 volts input and the heater will supply us with 10v. We are going to use the Sonoff SV in isolation mode by removing the two resisters that would normally supply the power to the controller using the input voltage.



Firmware

Flashing

filefcs.v3.5.sv-poolheater.bin

FirmwareRelease DateDownload
v3.35view2022-05-12

name
height250


Once the flashing is complete, it will reboot.  You will need to look for pool-heater, in your list of available WIFI networks.

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