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I know they are a lot more. Get a Takagi. they are well made and all are made in Japan. I talk with a rep and he claims that the Renni uses some Chinese made parts. I am sure they are good and up to standard. I have not heard one bad thing about Renni yet. I spend a whole day taking a class learning about their tankless heaters in Irvine. I have had my plumber do the install while I spec out what it needs. I have one of their largest unit at my house and are absolute happpy with it. I have a large tube with jets and and have run it with my muti head shower at the same time and have no problem with hot water. We are certify Renni installers too (no big deal, they spend a day telling you how and what they want you to do with their heaters), but my plumber has only installed something like 4 for our clients so far. I am thinking, why not install the best for my clients. Get them the porsche and not the Miata.
You might think about having 2 small units for your home, if not, you might want to run a recir. pump and a temp switch to stop the pump when necessary. Do not forget the expandsion tank.
I have not read through all the post, just came back from Alaska. Fire away if you have more questions.
Jeff
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