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-   -   Sump Pump Design (http://www.diychatroom.com/f7/sump-pump-design-29283/)

handy man88 10-02-2008 08:18 PM

Sump Pump Design
 
I just picked up a sump pump with a vertical float to replace the "perfectly good" 10 year old sump pump with tethered float that I have right now.

The reason why I am replacing the tethered float sump because I also have a backup sump pump in the pit that of course has a float that travels a very small distance before activation.

The existing tethered float sump activates at a very high height of water, almost to the top of the train tile, which means my backup sump's float is very high and almost touching the lid.

Initially, I guesstimated that the tethered float's initiation point is much higher than a vertical float's sump.

Today at Home Depot, it was confirmed when I looked at the technical specs of both designs where it said a tethered float activates at 14" height of water, while a vertical float sump activates at 8" of water.

My question is don't most people want water out of their pit asap, as soon as it reaches the bottom of the drain tile?

What's the real benefit of a tethered design?

For the record, the tethered 1/3 hp sump is about $40 "cheaper" than the vertical float design with the same pumping power. It's made by Flotec.

jamiedolan 10-04-2008 09:33 PM

My question is don't most people want water out of their pit asap, as soon as it reaches the bottom of the drain tile?

Well, yes, and no, most people don't like there pump turning on and off continuously & rapidly - tends to burn em up. Hence the reason you want to let a certain amount of water build up before it pumps it out, the pump runs less often. Plus there is no benefit to getting the water out faster, it's normal for some to be in the bottom.

What's the real benefit of a tethered design?

For the record, the tethered 1/3 hp sump is about $40 "cheaper" than the vertical float design with the same pumping power. It's made by Flotec.

The real benefit. I'd say the only possible benefit is that you save some money on the initial purchase only to later find out that the .09 cent switch in the tethered float isn't even worth a nickel, cause it failed and your basement flooded.

Did I mention I hate the tethered float design? I've seen a number of them fail, in a number of brands. I will never ever use one again.

Some of the Little giant pumps are awesome pumps. Liberty pumps have a good rep. Zoeller are top of the line:

http://www.faucetdepot.com/faucetdep...LAID=216229921

Jamie

handy man88 10-04-2008 10:48 PM

Quote:

Originally Posted by jamiedolan (Post 168380)
My question is don't most people want water out of their pit asap, as soon as it reaches the bottom of the drain tile?

Well, yes, and no, most people don't like there pump turning on and off continuously & rapidly - tends to burn em up. Hence the reason you want to let a certain amount of water build up before it pumps it out, the pump runs less often. Plus there is no benefit to getting the water out faster, it's normal for some to be in the bottom.

What's the real benefit of a tethered design?

For the record, the tethered 1/3 hp sump is about $40 "cheaper" than the vertical float design with the same pumping power. It's made by Flotec.

The real benefit. I'd say the only possible benefit is that you save some money on the initial purchase only to later find out that the .09 cent switch in the tethered float isn't even worth a nickel, cause it failed and your basement flooded.

Did I mention I hate the tethered float design? I've seen a number of them fail, in a number of brands. I will never ever use one again.

Some of the Little giant pumps are awesome pumps. Liberty pumps have a good rep. Zoeller are top of the line:

http://www.faucetdepot.com/faucetdep...LAID=216229921

Jamie

I totally agree that you want the pump to not work more than needed.

Ideally, you want the pump to initiate when the water level reaches the bottom lip of your drain tile.

Most tethered floats though, only kick in when your drain tile is full and the water level reaches the top of the drain tile.

Unfortunately for most, including me though, is that the current tethered design forces me to position my backup pump's emergency float at a height almost touching the top of my pit's lid. The water level at the pit may never reach the lid as water would be squirting through in other areas of the basement.

What I don't want to happen is for both pumps to operate at the same time if the floats are too close to each other and both happen to trigger at the same time.

When you think about it, even though a sump pump with a vertical float operates more than a sump pump with a tethered float, the pump itself isn't running every day for 365 days year even in the wettest climates.

In a moderate climate, it may run 3 times/month.

Vertical float design current activates at 8" of water, while tethered activates at 14". That 's a 6" difference. I think when I install my new vertical float pump, I could position 1.5" brick on the bottom of the pump to sort of shim up the activation height to give me 9.5" instead.


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