Hot Water-energy free
I just completed a consulting job to design the Plumbing system for a friend who is building a new home in Arizona.
He is building a 4br 3-1/2 bath with walkin shower and soaker tub in the master bath.
The targeted design parameters were:
Instant on hot water at all locations.
Maximum water conservation
Maximum fuel economy for heating the water.
The end result,,100gal of on demand hot water available at all times, recirculation loop for instant on hot water, (which will eliminate the cold water normally wasted as we wait for the hot to arrive at the fixture) and all of the hot water being heated by heat recovery from his AC system while reducing the operating cost of the AC at the same time.
My first prototype of this system was installed in a 3br in Pensacola, Fla 5 years ago. We initially installed that system in May and the following November when the weather cooled off the homeowner called me to say his water heater was not working. Upon examination we discovered that we had never attached a gas line to the water heater, thus the heat recovery system had met 100% of his demand for the entire AC season.