content: I bought online and installed it myself using compression fittings - very easy to do. Total cost $650, total time about 1/2 a day. I live in northern VA (it's very important to know ground water temperature with smaller units) and can get 2 showers+ in the summer. In the winter 1 shower + 1 faucet. There is a little fluctuation in temperature in the winter, but I think this can be corrected with the hot water valve now that I know what's going on. Electric is actually cheaper than gas in our area, so this was a good choice. Monthly savings appear to be about 19 percent. Made one service call and got a quick answer.