I just went outside and noticed that my Summit Sum 5 heater is gushing water upwards from the bottom inlet pipe that appears to have some sort of small valve/opening on it. I've only owned this house and pool for about a year, so I'm not terribly familiar with the inner workings of the heater.
Any idea what this is or why this is happening?
Here are a couple pics I grabbed :
Shared album - Robert Krueger - Google Photos