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Author Topic: Pressurized vs. Non Pressurized  (Read 7828 times)

Cabo

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Re: Pressurized vs. Non Pressurized
« Reply #15 on: March 25, 2014, 05:03:42 PM »
If you were going to use a Grundfos 15-58 on the OWB side would you replace it with a 15-55 stainless model.  I see that it goes from 1/25 hp to 1/12 hp but don't see a 15-58 in stainless.  Also, would there be any advantage to go to a 230V model?  Assuming it would draw less amps but they don't give any amp specs on the 115V model.  Maybe i'm looking in the wrong place.
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LittleJohn

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Re: Pressurized vs. Non Pressurized
« Reply #16 on: March 28, 2014, 08:24:27 AM »
I would compare pump curves and see if the 2 pumps are comparible - but since you will be running SS I will refer to my earlier state since the $$$ between a 3 speed 15-55 and an Alpha is so small; I would run an ALPHA
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Cabo

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Re: Pressurized vs. Non Pressurized
« Reply #17 on: April 14, 2014, 04:58:05 PM »
Just an update on the original post.  Like you guys said, the pump ended up going.  Less then a year it lasted using it in an open system.  I think the pump already had some use on it before the switch but still.  I asked if it was replaced with a SS and it wasn't.  Do it once and do it right.
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TheBoiler

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Re: ProFab has some issues!
« Reply #18 on: April 14, 2014, 05:37:38 PM »
I grew with radiator systems, open, using Oil or Gas as a fuel source, they were the norm. Would need a header tank.

The problem that has been mentioned is one of water quality. I am not sure how that differs with a pressurized system, needs a header tank.

Where I grew up it was a hard water area, standard service for a plumber to flush them out as the pipes and radiators clogged up, I think you could rent the equipment.

Pumps were not exotic, obviously they would go, more so if you had not kept up on water treatment.

As an aside even if you have a Pressurised system disconnected from an OWB with a heat exchanger, there is still a pump in the boiler pumping the water around.
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Sprinter

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Re: Pressurized vs. Non Pressurized
« Reply #19 on: April 14, 2014, 06:44:55 PM »
What do you mean you asked if it was replaced witha SS model. Did you have someone repair it for you?
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Cabo

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Re: Pressurized vs. Non Pressurized
« Reply #20 on: April 14, 2014, 07:29:21 PM »
I asked if when the pump was replaced if they used a stainless steel or brass instead of a cast iron.  I know the owner replaced it himself.  As I recall it is recommended not to use a cast iron pump in an open system due to the warranty.
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Sprinter

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Re: Pressurized vs. Non Pressurized
« Reply #21 on: April 14, 2014, 09:27:44 PM »
I get it now, yeah cast iron + open= no warranty
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