Indirect heating tank

Two questions. My tank is about 7 feet away from boiler. Would it be much of a cost saving measure to move it right next to the boiler with say 2 feet of pipe. Seems like a lot of heat loss when the guys could have put it right next to the boiler. Next question is what should my DHW temp be set to. Right now it heats to 180 degrees in the summer. I am single and take two showers a day. I live in a 3000sqf house so tank is pretty big. Can I turn my boiler water temp down. Seems like a waist to heat to 180 all day.

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