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Vash,
I say one word. Takagi. Stay away from the Bosh units. Noritez (sp) is my next choice.
Tell me what you are doing. How many baths? body jets, tubs muti shower heads? How long is the run from the heater to the bath. If its too long you will wait for a long time for hot water, so you will need a recirc. pump and additional piping. and get a thermo switch so the pump will turn on and off when it senses a certain temp. don't let the plumming guys sell you a pump that has a timer temp switch in one unit. That **** doesn't work. Ask me how I know. Also offdifferent units require different size gas line and some may need greater pressure. If you mount it outside, then all is fine. If its inside, you need specific SS vent lines.
I have a Takagi TM1 commerical unit at my house and all my client's as well. I think they are the best money can buy. Tech service is great. You need to find a good plummer who know what each specific heater needs and be very specific on that if not it will not function property. Plummers do not like to read. That's my job. Good luck.
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