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[hpowers]

have a wilo, both have failed this year, even though warrantied its concerning
 what ya'all recomend

[Wood Nutt]

My run is closer to 225' and I use a Grunfos 26-99.  Taco has a pump that is close to the same size but I don't recall what model it is.   My stove is higher than or almost level with my HX, which is in my basement, so don't have much head (change in elevation) to deal with, but what ever pump you decide on, look at the pump's rating curve and pick one that your conditions are at least in the middle of the acceptable limits for the pump.  If you run it at its upper limit all of the time, you are likely asking for more problems.  Your pipe size will dictate some of this too, the smaller the pipe, the more flow loss you get from friction (water moving against the sides of the pipe). 

[LittleJohn]

I personally went with a Stainless Steel Grundfos Alpha, cause it has the auto-adapt feature and a readout of GPM and instantaneous power draw.  Also wasn't that much more that a SS three speed from Grundfos.

[Sprinter]

Taco or grundfos are very safe and reliable pumps. Even the wills are decent. Running a pump at max in proper conditions is fine, that's what they were meant for. Is debris, lack of flow and long down time that hurts them the most. It doesn't take much rust to form around the impeller to lock it up, and exactly why some controllers cycle pumps during shoulder months.
Calculating total equivalent length of pipe will give you head. Head is not elevation when it comes to pumps. That's why they are technically called circulators. What goes up must come down, equal displacement of fluid. Circulators create a high and low pressure on either side of the impeller and the fluid follows the laws of physics to balance the pressure by movement.
This is exactly why the delta T and delta P pumps are gaining popularity, it takes the guess work or calculating out of the equation for the lazy plumber.
Too much pump erodes metal components, kills efficiency and creates noise. The system or HE has a specific design delta T and GPM flow to meets its performance. Before anyone can help you, a lot more info is needed to calc. Brand wise , taco or grundfos is all I would recommend, and in and open loop system bronze or stainless takes the corrosion factor out.

[Wood Nutt]

Here is an explanation of pump fundamentals and describes head and the pressure differential Sprinter talked about.  You know or can get the specifics of your application, so hopefully this helps figure out the best pump for you.  Good luck!

http://www.pumpfundamentals.com/what%20is%20head.pdf

[Sprinter]

Nice article, but that adds to the confusion. Those are static head applications, like sump pumps, ejectors and irrigation examples where the fluid does not return or not in a loop. Closed or not.

If someone has some time, goto and register at Taco flo pro university, then goto anatomy of a circulator. Video and all the others are worth paying for, but they are free.

http://m.youtube.com/watch?v=Xja1viotVvk

I couldn't link the actual taco site video,and only found this one on utube. The "creating flow" part 2 video I haven't found on utube yet. Also watch the one on how to read and select from a curve chart

[victor6deep]

Armstrong E9 and be done with it and the competition.

[dukethebeagle]

i got a taco 009-f5.would probably part with it.not alot of use.