[Brillo]

Our plumber installed a Rinnai (natural) gas unit at my mother's house 2.5 years ago, had one installed in our house 1.5 years ago. No problems.

An issue at my mother's is the distance the hot water has to travel from the unit, causing a wait in the kitchen and one bathroom that is the furthest from the unit. The bathroom she uses the most is closest to the unit, so it is not a major problem. It is most noticeable in the winter time. The wait can be over a minute to the furthest faucet, which can drive the cost up I guess.

The layout of our house is different, the unit is more central to all fixtures and the wait is minimal, again longest during the colder months. I read recently where you can put a recirculating pump inline that would solve this. Of course costs would then go up and I'm not sure it would be worth it.

I know of a couple of friends with Takagi units and have had some problems with them.

We take long hot showers and have the dishwasher running, sometimes the clothes washer with a load on hot and have not had any drop in temperature that we could notice.