Our water heater broke in March of 2020. John Gallagher convinced us to spend almost $7,000 to replace that electric one with a state of the art gas heater. He was honest about the pro's and cons and I made an educated decision after discussing with him as well as consulting with several friends. By buying the heater, we removed the ugly heater from our laundry room, giving us more space there. John did the installation that same day and we were pleased with the results.
It did reduce our electric costs but increased our gas costs, and we use a little less water than before because we paid extra for one bathroom to heat up the water within 10 seconds (instead of about 60 seconds). Overall, I'm not sure we saved any money, though.
However, I started smell gas after a while. The gas company always warns you to take this very seriously b/c it could indicate a dangerous leak. (A couple here in Charlotte died a few years ago when they had a gas leak that destroyed their house.). I called John and he returned my call a couple of days later. That was disappointing. He said he didn't know anything about it and that I should call the manufacturer's local rep. Disappointing again. When I did call, the rep said that John should be handling that for me, so I called John back. He said he did some research and found that smelling gas is a known problem with this equipment, but that's it's normal and I shouldn't worry about it. So I called the gas company (which I should have done in the first place). They came within 2 hours and said there was no leak. I think John should have been aware of this issue and should explain it to potential customers. Smelling gas is supposed to be a warning of a dangerous problem, but now I smell it all the time and don't have any sort of warning that there might be a leak.
You can change the temperature and set the times for the quick-heating through the internet, which is really cool. A couple of months ago, Renai, the manufacturer, sent us an email that we needed to update our module, but we couldn't find the controls as described in the email. So we called John and left a message. We waited two days and left another message and he didn't respond again. He still hasn't responded.