In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
When I first had my house built, the plumber hooked up 2 rannai-85 heaters side by side operating in the same line. In essence both heaters are heating the house when only 1 faucet is on. From day one, it has taken forever for the water to get hot(im talking several minutes) and even after it gets hot, it randomly gets cold. no matter what i set the controller at it does this. Would taking out 1 heater help alleviate this or are the units too big? The water pressure seems fine and all faucets really spew out the water. when I shower it works fine when I run the shower and sink together. Is one rannai countering out the other or what im so confused. ive had several plumbers out and they havent a clue honestly. this is a pic of the setup. please help.