Water keeps shooting out of my sight glass

I installed a sight glass on my HLT and it keeps getting air bubbles in it which can't rise fast enough and every few seconds about a tbs of water squirts out the top! I drilled the hole for it as low as I could so I could measure small amounts of water, and I'm thinking that's why. The water is nowhere near boiling yet, it started happening about 30 seconds after I lit the burner. Is this common, and is there an easy solution that I'm missing? This is annoying.

Well, offsetting the pot so that the sight glass is a little further from the burner seems to have it under control. Still impossible to get a good reading while the heat is on, but that's ok since I fill it then heat it.

Fairly common with my setup. The elbow seems to retain more heat than the keg, causing higher temps in that area. Stirring seems to help a bit. No big deal because less than a quart is lost through out the heating cycle.

You might be able to insert a needle/wire down the top of the sight glass. the needle should pop the bubbles and prevent them from bubbling out.
Maybe try a paper clip to test the idea.

Create a deflector under the elbow with a cm or 2 of space. That oughta keep the heat away......

Tin foil is a quick solution....whatever permanent solution you choose can mimick the tin foil.

Try a 1/4" X 1/2"-3/4" long SS bolt in the top of the tube, the threads slow the bubble long enough to seperate without liquid shooting out the top.

A deflector was my plan until I decided the loss was minimal.

I have a needle valve on the top of mine.

I had the exact problem but it was from boil bubbles easily entering from inside. The fix was putting a short nipple on the inside to make the bubbles have a harder time getting into the fitting. Not a single problem now. Of course, a small heat shield is a decent idea too if you think the bubbles are forming inside the tube itself.