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I'm looking to match a DHW indirect tank to a Buderus GB142/30. Based on a manual J, I'm rather confident in the boiler sizing, but am not sure of the tank size I will need. I have 2 adults and 3 kids in the house- though the kids will be adults before too long. The house has 3.5 baths plus all the usual appliances. No whirlpool tubs. No unusual/multiple shower heads. I imagine I will use a Buderus tank, though I'm open to suggestions. Thanks