negative pressure

I am planning to install a 50 gallon Rheem HPWH(in garage main level) in series with a basic 50 gallon Rheem 4500 watt electric unit(in basement one level down). The reasoning for this is to increase total amount of available hot water for the few times a year we run out of hot water and to save...

I purchased a home from 1958 a few years ago and it underwent a major renovation (all new windows and doors, main level ceiling torn down and reinsulated). The house is a split level with two fireplaces, one upstairs and one downstairs, with separate flues. The first time I lit the upstairs...