The smaller tank is only for DHW. The demand for hot water won't change much with weather, especially with the preheat tank.
So with a desuperheater, the heat pump will supply the second stage hot water until the source water gets below the balance point, at which point it switches to the backup boiler.
It's also possible to use colloidal silver to kill bacteria but I don't know enough on how to design a system for that or if it's cost effective.
__________________
To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
|