[rfuerst911sc]

How long they last has variables , like grit/sand in the water . Also lightning strikes . Just two examples . Rough guess is 15 - 20 years .

I would call a pro and get it done . You ever pulled 200 ' of pipe vertically ? Enough said . They will warranty their pump and install .

Be there when they do the work . You will learn exactly how deep it is and any other info the dude tells you . If your pump is still good you can replace the siphon valve and keep it as a spare .