Boiler system valves DZR rating

Blend9684 · January 11

Seems I ordered ball valves with a low DZR rating from SupplyHouse - "Please Note: This product is susceptible to dezincification and does not hold a high DZR rating. This product should not be used in applications where brass parts may be exposed to hard water (high sulfur or mineral content)."

I was planning on filling the boiler from my well water after the sediment filter but before the softener.

Hardness was 68.4 PPM (moderately hard) when I last tested in 2014. Do I need different valves for hydronic components? I wasn't sure if closed-loop mattered.

hot_rod · January 11

Valves used on the potable water side need to be LL low lead.

Lead or or low DZR brass should be fine on hydronics as it is not seeing a constant renewal of water.

What boiler do you have?

I would check the boiler water quality spec. It should be in the boilers manual. Hard water is generally frowned upon. 68 ppm is under 4 gpg

7- 10 gpg seems to stick in my mind from manufacturers, 171 ppm.

Blend9684 · January 12

Bradford White FTCF199N per the book (they add additional letters/numbers when ordering). Same as the Laars FTCF199N. Floor-standing combi.

I'm not seeing anything in the books regarding water quality. DHW would use softened water but I didn't think ion-exchanged water was good for the boiler side.

Total system volume is only ~42 gallons with 21-gallon buffer tank. Probably straightforward to source elsewhere and just use the well water for makeup and not initial fill (though water might not be that hard).

hot_rod · January 12

odd that the manual talks about glycol but not plain fill water?

I agree with this statement in the manual however, I’m a big proponent of hydronic conditioners. Your water seems fine, just squirt a can of Rhomar, Axiom or Fernox in

Boiler system valves DZR rating

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