Cast iron circulator

[Central Boiler 6048]

I've been wondering how many guys are running  cast-iron circulators on a open system with a wood boiler? When I talk to the lady at grundfos she said I needed stainless or Bronze? I told her everybody that I know runs cast-iron. I can't imagine that I would need a stainless if you change your water out every three years thats treated? I've even done the test with steel wool and my water is clean after seven days.

[Dave Shepard]

All mine are cast iron. I don't know anybody who uses anything else. If you have treated your water, then it shouldn't be an issue. Why change your water? If it's been treated, then it's good to go.

[pabst79]

 We usually install cast iron on open systems, there have been certain systems that rust and sludge up depending on water quality , stainless steel or bronze are used for domestic water purposes, most states do not allow raw cast iron in a potable water system, maybe the help at Grunfos was worried about oxygen prematurely wrecking the pump or were just confused, I get confused alot  say_what 

[Central Boiler 6048]

Dave,
Central boiler wants you to change your water every three years. That's where I got changing the water from. Thanks for the help on the cast iron part.

[WmFritz]

Dave,
Central boiler wants you to change your water every three years. That's where I got changing the water from. Thanks for the help on the cast iron part.

They probably want you to buy their boiler treatment too.  :