I've been thinking about running a pipe from the basement up to the peak of my A frame to preheat water before it enters the water heater. Instead of having to heat up 40-45 degree well water it would be 70-80 degree water since the loft is usually 75-85 degrees. I figure a 1 inch pipe up, along the peak, and back down should hold around 5 gallons or so. Maybe go up to a 2 inch pipe along the peak to hold more water. What do you think?