are there ecm circs that are stainless and not $2000 for radiant indirect systems

keyote

it seems all the ecm pumps are cast except some seriously expensive wilos or am i not finding them

keyote

I found the stainless alpha grundfos oddly google didnt find it, but still cant find any comparable other brands any opinions if their are other options or is grundfos the way to go

Gordy

Why SS? The only time you need SS Circs is if non barrier pex, or an open system is used. Neither of which is a good design.

keyote

Gordy I used oxygen barrier pex and of course all brass copper fittings and stainless a manifold but I have bought a used TT110 prestige and the TT smart indirect DHW tank which i was going to use at least until I bring all four floors on line. And I thought i saw somewhere in the manual or a label that to protect the outer jacket of the tank or outer tank i think only the inner tank is stainless. Am i misunderstanding.
{currently the three lower floors are still running on an atmospheric dragon and 100 year old asbestos pipes.which i will keep separated until retired }
If I dont need stainless there seem to be comparable ecms like taco is there a consensus is it coke v pepsi

Gordy

You can use a CI circulator. It's when oxygen is constantly introduced via non barrier tubing, or an open type of system there will be corrosion issues to ferrous metals. Save your money.

keyote

thanks Gordy.