So far tankless has exceeded my expectations. My gas tank heater was outside. I'm in Charleston SC, which is mild climate, but we can get some freezing temps in winter and the gas heater used a lot more gas in winter to keep water hot. See picture of bill, like 10x more. Tank was only 5 years old and had black crud built up in cold and hot nipple pipes when I disconnected them. The last one only held up 7 years, so I'm thinking having water heater outside just isn't good. I'm also adding a one bedroom apartment to rent out so going with tankless made more sense than adding another electric in very limited closet space and one outside. Glad I went tankless. It was a lot of work to install one indoors. The last day took 12 hours straight in the crawl space, plus another 4-5 half days to instal vent, run new gas line, and new line for power to a few new closets. I'm glad I made sure everything was done right. I probably used too much solder for my sweats but was so pleased that it all worked perfectly and fired right up. Its now up to code, going to save about $200 a year, and unlimited hot water for me and renters, for at least 2 showers and two other fixtures at the same time. Maintenance looks very easy. I set mine to notify me for maintenance reminders. I'm on city water with moderately soft water. I also feel like this unit is going to hold up. So if mine last over 5 years its worth it, and reviews claim they can last up to 20 or longer. My biggest concern was it breaking with guest and not being able to have it repaired soon but considering all the benefits I'll be more than willing to pay technician to fix it or if its over 8 years just swap it out for a new one. Only issue is HE front loading washer pulses hot water or some hot water cycles, so not ideal, but I realized I had of long run anyway, and always used cold water. A point of use might be good solution if you need sanitary cycle often, although it does have onboard steam function and heater. I also ran 3/4 copper in and out, then to pex manifold with 1/2 pex to each fixture. It gets hot water to all fixtures faster than 3/4 line it replaced. I'm in the process of renovation and doing most of the work myself, and don't claim to be an expert, but so far very pleased I went with tankless. I would also recommend this model, although there could be better options. Like all technology you have to wait for the bugs to get sorted out. There is also variables with installation and up front cost, but my impression is that it will last longer and be very reliable and offer much better performance.