Heating - Variable Speed Pump

If the pump is for potable water then buy the stainless steel version because potable water is oxygenated. Only in the case of a closed radiant heating system with oxygen barrier PEX is it ok to use the cast iron version.

Stainless version

Taco Variable Speed Stainless Pump 008

008 Variable Speed Delta-T Stainless Steel Circulator Pump, 1/25 HP

http://www.supplyhouse.com/Taco-008-VDTSF6-1-008-Variable-Speed-Delta-T-Stainless-Steel-Circulator-Pump-1-25-HP $251.25

Cast iron version

008 Variable Speed Delta-T Cast Iron Circulator Pump, 1/25 HP

http://www.supplyhouse.com/Taco-008-VDTF6-2-008-Variable-Speed-Delta-T-Cast-Iron-Circulator-Pump-1-25-HP $167.15

Detailed info

http://s3.supplyhouse.com/product_files/008-VDTF6-2-install.pdf

Pump Flanges (Stainless)

Pump Flange Stainless

http://www.supplyhouse.com/Taco-110-251SF-3-4-Taco-Stainless-Steel-Freedom-Flange-Pair $27.78

Pump Flanges (Iron)

Taco Freedom Flange Iron

http://www.supplyhouse.com/Taco-110-251F-3-4-Taco-Iron-Freedom-Flange-Pair-1973000-p $9.19