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[Bondo]

I agree -> KISS, is the way to go

As long as you have a back up pump available, i.e. on the shelf you should be fine.  BTW, why travel when its -40 c/f that is too cold to be outside

Definitely too cold to change a pump.......
Fingers would fall off.!!

Ayuh,....    Is the plumbin' in the house, as low, or lower than the bottom of the boiler,..??

You can put yer pumps Inside, 'n not have any on the boiler,...

Warm hands changin' it,...     

[RSI]

You can put a 2nd pump in series for a backup and it doesn't cause that much restriction. Water flows through fine when it is off.
You could put a strap on aquastat on it so it only runs when the water line cools. If you put it on the return line it could even be set to come on if you have big temperature drop under load.

[slimjim]

Good answer RSI, I was thinking the same thing!

[kommandokenny]

Thanks guys.

My next concern would be if one of the inline pumps seizes would it restrict the flow enough to make the whole excercise not worth doing.
Gotta look at the pump internals.

Bondo, I like the idea of the pump on the back of the boiler.
And I still want a backup pump in the basement.

Only thing stopping me is flow issue from seized impeller??
Gonna look for schematic.of taco 011

kk

[mlappin]

Unless todays pumps are not what they used to be, I think you're getting worried over something that could never happen.

15 years on my original Grundfos. But like I said, maybe even Grundfos is not as good as they were?

[RSI]

Water quality can make a big difference on how long a pump lasts. Some go out way sooner than that.

Water will still flow through the pump ok even if it was frozen up. Something with the type impeller like Grundfos uses would be better for the pump that is not normally running. The type of impeller that Taco uses will probably cause more restriction. 1st pic is Taco, 2nd is grundfos.
 

[kommandokenny]

Thanks,, that's what I wanted to hear.
If the impeller is seized stiff, water can still be pulled through by a second pump down line.
I'm probably gonna do it.
It's like having an extra pump on the shelf.
Who doesn't recommend that??
It's already hooked up,,, and ready to roll.
Thanks rsi

[Bondo]

Thanks,, that's what I wanted to hear.
If the impeller is seized stiff, water can still be pulled through by a second pump down line.
I'm probably gonna do it.
It's like having an extra pump on the shelf.
Who doesn't recommend that??
It's already hooked up,,, and ready to roll.
Thanks rsi

Ayuh,....    The only thing I'll add is,....    Over the last few years, since I discovered 'em,....

I've switched out my pump flanges to the ones with the built-in ball-valve,....

Changin' a pump is a breeze, with maybe a cup of lost water,...

No more system drainin', just to swap an entire pump,....

[kommandokenny]

No draining to replace the cartridge. [at the boiler anyway]


https://www.youtube.com/watch?v=E0X8m0BGZ1g

[woodbutcher]

When I installed my owb 15 years ago, the dealer told me to put the pump in the basement. He said that if it goes out it won't be when the temp is in the 30's. I did and never regretted it. I did have a Y strainer in the line before the pump and the cartage went out almost once a year. Dealer told me to remove it and keep the pump running year around. Since I did this, the pump has never died in the last 4 years running non stop with no filter. 

[kommandokenny]

The restriction by the strainer burned out the pump???
This is interesting...

[RSI]

Most likely it did. These pumps can not have negative pressure on the inlet if you want them to last very long. That it the reason it is usually better to put at the back of the stove. In the house works ok as long as water flows to it without it needing to suck.

[kommandokenny]

Once again, thanks for that .
So leave taco 011 on the back of the stove and could I put a smaller gpm,,  less restrictive,, Grundfos in the basement unplugged and ready?
[Suggestion for second pump]
It ciculates fine now,, so just for backup?

kk

[RSI]

It depends on what you have in your system. A Grundfos 15-58 should work fine but if you want it to be able to run for a fairly long time till you would get around to swapping the other, you may want to just go with a 26-99 since they can be found cheap right now.

[kommandokenny]

Martin says they last 15 years ........
even I would get it changed by then