The tripping breaker is a clue. The bottom element is probably broken and the non switched side is grounded, causing the temp to rise above the set point.
Also the age of the valve, once it opened it didn't fully seal back.
Chances are the bottom of the tank is filled with sand and sediment. Changing the element will be a temporary fix unless the sediment can be removed, more work than a 10 year old heater is worth.
Might also check the charge in the tank bladder, especially if the pump is rapid cycling. If the bladder is bad the expanding hot water will be up against the check valve in the well, with no place to go.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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