Originally Posted by nealtw
If you have a pressure reducing valve near the shut off valve you can take that down to about 60lbs and I think Joe is right about replacing the pressure release valve on the water tank.
Thanks Neal. Sorry to be dense but do mean replace the TPR valve on the side of the water heater or replace the wilkins valve on the hot water line. I'm thinking you mean the TPR because it should be releasing water with this high pressure problem and it is not. The wilkins valve is doing the release, thankfully. The pipe to the wilkins is warm and I can hear it running and the pipe to the TPR is cold with no running sound.
I do have a pressure reducing valve (cone shaped thing) at the point where water comes into the garage (where the water heater is located). I adjusted it counter clockwise a number of turns and it had very little effect on reducing static pressure. Only went down by 2lbs. Did at least 5 turns so it backed out a distance of 5mm. I'm afraid to back it out any more.