I install 4 or 5 every week. This was a little pricey because there was a long wire/pipe run through the garage and basement to get to the transfer switch. Cost was $22k. We have guys that do all the trenching and site work, and then we sub out the plumbing. All of that is included in the cost. This is also why I love warm winters. Installs are really tough when the ground is frozen!