I have sent a photo. The overall box is 44" x 33", made of a plywood bottom and 2 x4 sides. It is painted dull black. I am not sure how long the hoses are, we used two to coil in the box. One of the hoses was green, spray painted black. There are two wood pieces that are attached to keep the hose in place. On top of the box was a clear plexiglass sheet to help heat the hoses. In the upper left corner of the photo you can see the in and out hoses. The in hose was hooked to a sump pump in the pool. The sump pump was placed on the timer at 30 minute on/off. It was running whenever it was warm enough to heat the water. The out hose was connected to a black hose that laid on the ground and returned to the pool for additional heating. The box was was nailed together.
It could be tilted to allow rain water to drain off. It is very portable and we are currently not using it now as the pool water is warm enough.
Hope this helps someone.