New construction, 3770 sq feet, 3 1/5 bath. Plan to put in two WH, one for kitchen and utility and 1/2 bath, the other for the 3 baths. Plan to use two manobloc/pex home run systems. For times when there are no guests, only one couple, does it make sense to add a tie line so that one or the other WHs can be turned off and allow only one to supply the house ??