What circulators to use?

[jrod770]

I'm getting ready to start installation on an outdoor gasser. It will sit about 50' from house and be supplied by 2 1" al pex lines, insulated of course. I attached a diagram to show what the set up will be in the basement. Al pex will enter into the house to a manifold, from there it will feed a flat plate for domestic hot water and a water to air heat exchanger above the propane forced air furnace. There are currently 2 water heaters in basement, 1 80 gallon electric and 1 propane power vent. The propane power vent is currently shut off and currently using the electric. They are both set up right now how you see them, with circ lines returning back into the bottom of each tank. I will have 3 circs on my set up, 1 from manifold to water to air hx, 1 from manifold to flat plate, and 1 that circulates hot water through out the house. I have some long runs and the wifey hates waiting for hot water to get there. My question is, How does my schematic look and what pumps would you put in for all 3 locations?
Thanks for your input.

 

[velvetfoot]

I'll chime in, though I'm no expert. I use b&g ecocirc ecm pumps for my heating hot water, but they also make a model for potable water, with a timer. I'm sure there are others, but this is pretty low power. I'm not sure circulating dhw is a big money saver though.
http://bellgossett.com/pumps-circul...rs/ecocirc-e3-domestic-hot-water-circulators/

 

[jrod770]

Yes, I was thinking about one of the B & G ecocirc's for the potable side of the flat plate. I currently have a small Laing on that circulating loop and it struggles to do the job. The one I have is old and has no adjustable flow rate.

 

[jrod770]

Should I be thinking about an Alpha or Bumblebee to feed the water to air heat exchanger? What about a second for the flat plate?

 

[maple1]

Yes, I was thinking about one of the B & G ecocirc's for the potable side of the flat plate. I currently have a small Laing on that circulating loop and it struggles to do the job. The one I have is old and has no adjustable flow rate.

I've got one of the little ones for my dhw side. 'E3cocirc'?. Works great.

 

[mike van]

My thought would be is the 1" pex big enough?

 

[jrod770]

It's 1" al pex, so ID is just a hair over 1" and it is only going 50-60' one direction.

 

[Whitepine2]

My thought would be is the 1" pex big enough?

I would go at least 1 1/4" only do it ounce and do it right it's a pita to redo it.