Flushing Water Heater (2)

Earlier today, I flushed our water heater. It was the second time I did the flushing based on the instructions I wrote for myself last year. Everything went well, except when I opened the valve at the bottom of the tank to drain the water. All I had to do was turning the big plastic knob to the left to open up the line, but I couldn’t remember. I tried to force it. Luckily I didn’t break it yet. It would have been a nightmare if that valve broke. I wanted to keep a note here so I can remember next year.