Question
I read about a passive recirculating system using a purpose-built valve for a second-story bath. Will this work on a single story?
I'm trying to create a seed-germination heat bench close to my water heater using hot water. I could use small copper coils or another material I saw used in a commercial greenhouse. What is the simplest and most energy efficient way to circulate hot water though my system to create a constant temperature at the benchtop? I read about a passive recirculating system using a purpose built valve for a second-story bath. Will this work on a single story?
Answer
I know firsthand that earlier versions of passive loops didn't work all that well on a single story, but I am not familiar with current models. Now I use an on-demand circulation pump. That is the most energy-efficient way I have found to circulate domestic hot water, because you only use it when you need it. If you need it constant, then of course, this doesn't work for you. You probably will need to use a standard hot water recirculating pump on a thermostat. If you can do it, however, the most efficient germinating bed I've found is fresh manure laid below the beds.
