This image shows how the new and existing pipes will act in crawlspace and around the floor joists. Looking at the parallel pipes; the newer one is on the left side. It will lead through the floor into the laundy room and is shown tying into the Hot Water Tank on the 3rd image.

This is the homes existing Hot Water Tank prior to the system being added.

This is the homes existing hot water tank, after the system was added. Notice the copper tubing on the right side (coming from the crawlspace shown in the 1st image), this tube will tie the pre heated hot water into the Hot Water Tank.