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Radiator shut off valve and boiler sight glass
Just moved into a house and am getting familiar with my gas-fired steam boiler. Couple of questions:
1. I've been trying to save on the gas bill by shutting off all the radiators upstairs during the day. In the back bedroom (which we never go in anyway) there's a radiator that seems to fill with steam even when the shut off valve is turned all the way clockwise (see picture). It's also unique in the house in that you can only turn it about 3/4 of a turn. The rest of the valves in the house need several full turns to fully open or close. What's the deal with this valve? I don't feel like heating a room that we never go in.
2. The boiler sight glass is filled up to 1/2 with water. About a 1/4 of the way up the sight glass is filled with rust colored water (see other picture). A few times I've drained the boiler to just below the bottom of the sight glass and filled it back up with fresh water, but the dirty water returns. Is this something I should even bother with? I have a probe type low water cutoff.
Thanks in advance.