Just ranting. Lost heat on Sunday night with our 25 year old Weil-Mclean NG boiler. Woke up to 61 in the house. Pilot ok, spark ok, vent dampner works properly. Turn the valve off, lose pilot, turn it back on, immediate pilot. Pilot is baking the flame sensor. OK NBD, ordered the flame sensor to start, its dated 1991 so why not, 150$ and overnight shipping. Swapped it out, no change. OK time to get the guy here. He takes a look and confirms its the gas valve....which is NLA. I called the supply house that I got the flame sensor from. I gave them the part number and they had only one updated option. Ordered it, got it on thursday and took a look. 3/4" in and out, mine is 1/2". My burner is 110k btu, this valve is rated at 250k lowest, up to 440. So of course that wont work safely, and now Im stuck replacing the whole unit on an emergency call for Saturday, with the highs looking to be 30 all next week, forcing my hand to a unit thats locally in stock. Peerless wouldnt be in until tuesday earliest, so we went with a Williamson to get the ball rolling. Frustrating when a "simple" 500$ fix turns into $5k. There were Honeywell update kits that would have been in mid week, however I dont know if the heating guys have had any experience updating these units, and it would be another week down with space heaters. /endrant.