I'm looking at purchasing a 3 bay manual wash. I know this will very drastically by region but the previous owner's P&L(more like a bar napkin ha ha) has his gas/water costs at $350/mo which I know isn't accurate because the gas/water/sewer bill for my house runs in the 300's/mo during the summer when watering the yard. I'm also looking at adding tankless heaters, are tankless worth the costs and what percent would you expect to save by converting. Thanks in advance as I'm a green pea hopefully near future car wash owner!