No technical info here, but if you are going to be supplying hot water to 3 bathrooms via tankless heaters, you should check with your power company to see if they will add a facilities charge because they have to upgrade the transformer and facilities that serve your new house. Tankless water heaters add a lot of instant demand to a transformer and sometimes need to be replaced with a larger one to handle the load. If natural gas is available, you might want to consider that to fire the water heaters if it is cheaper. Good luck to you and congrats on the new home.
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