I had one of those for a couple years. I replaced it with a yolink garage door controller as I was trying to get everything into one ecosystem. Pretty happy with it so far.

Isn’t there a flow switch? Mine has a Flow Switch as a safety feature that came with the cell. While I understand what you are trying to do, it is not safe for you or the equipment. If the cell has been on any significant amount of time with no flow, you have likely damaged it. See this Article