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[Sloppy_Snood]

I would agree with Jwood, SS Alpha is about the $$ as a 3 speed SS Grundfos -> Alpha might even be cheaper. and with the auto-Adapt you should not be overpumping system.  In regards to manifold, any Brass or stainless steel should work, I think there are even a few plastic manifolds out there (would check temperature rating before I installed a plastic manifold)

Sloppy_Snood, sorry forgot to read initial post, but to my credit you only asked about SS pumps/manifolds did not clearly state OPEN System

No blood, no foul.  I'm not crying on this.  You are indeed correct sir.  I'm just doing stainless circs, manifolds, etc., as much as I can to keep corossion sources to a minimum (but admittedly, my "backup pumps" will probably be carbon steel until I can save my non-Obama-snatched pennies up to afford 304 stainless backup pumps). 

In the not-so-esteemed words of my non-high school graduate buddy Jason, "It's All Good Dawg!"

[Jwood]

Stainless pump in my opinion are definitely the way to go! What's a couple hundred extra bucks between a couple pumps, when we are spending the money on doing it the best way for the system and longevity. I say its well worth the money!

[Chicken farmer]

Aren't the vast majority of OWB installations considered an "open" system? It was my understanding that the system had to be pressurized to be a closed system. Forgive my ignorance. I've just not seen open vs. closed conversation regarding OWB installations. Most of the time it is regarding indoor gasser systems. I just ordered a Ridgewood stop so now I'm reading up on systems.

Thanks!!

Farmer

[slimjim]

You are right Farmer, the majority are open to the atmosphere and it is for safety!

[LittleJohn]

Plus once you go closed loop there are some other safety features that are required, mainly an expansion tank and a pressure relief valve.

The pressure relief valve woudl be similar to the one found on all hot water heaters, accept its usually set around 35 psi; not 100-150psi like a hot water heater
The expansion tank for you average OWB would be HUGE, cause it has to absorb the expansion of 100's of gallons of water.