Grundfos Pump install location right?

[johnjh2o]

I don't see why it wouldn't work but I'm not an electrician. I wouldn't put to much faith in anything I say if it isn't round and have water flowing through it.

John

[LiQuId]

Doing that might interupt the Quantum flux capacitor in the pump causeing thermal deterioration in the matrix inhibitors..

[charless917]

Oh no not the Quantum flux capacitor

[zkirtlink]

you could install an outlet timer but it will throw off the time on the pump timer just keep it in the on possition. there is nothing wrong with the system you have going your pumping into the inlet side of the second heater. prefered actually it will help even out the load on the two heaters the second one will heat any return water that comes back cold where it is used to the first heater doing most of the work. yes insulater all hot lines that are accessable since they are all going to disipate heat and esspecially the main hot line and return for they both make it a full loop. the pump mounted directly on the hot side of the water heater that you are talking about is a comfort system the pump runs fairly low pressure. and there is a valve set that you install under the sink at the far end or multiple sinks if you have a spread out layout, they allow the cold water in the hot line to be pumped back into the cold water supply untill the hot water reaches the valve and it closes nice system if you you want a recerc. system but running the line is to pricey.

[johnjh2o]

Originally Posted by zkirtlink

you could install an outlet timer but it will throw off the time on the pump timer just keep it in the on possition. there is nothing wrong with the system you have going your pumping into the inlet side of the second heater. prefered actually it will help even out the load on the two heaters the second one will heat any return water that comes back cold where it is used to the first heater doing most of the work. yes insulater all hot lines that are accessable since they are all going to disipate heat and esspecially the main hot line and return for they both make it a full loop. the pump mounted directly on the hot side of the water heater that you are talking about is a comfort system the pump runs fairly low pressure. and there is a valve set that you install under the sink at the far end or multiple sinks if you have a spread out layout, they allow the cold water in the hot line to be pumped back into the cold water supply untill the hot water reaches the valve and it closes nice system if you you want a recerc. system but running the line is to pricey.

He has a designated return line he is not using the cold water line as his return.

John

[charless917]

Thanks for the replies. So far i have been told that i should run the return loop from the inlet on the first heater, or from the drain valve on the first heater, or leave it alone and have it coming into the inlet on the 2nd heater. Of course I like the sounds of not changing it but at this point it doesn't matter what I do. I have parts to do any one of those. Can I get one more vote on which setup is best? Also if I leave it alone and have the return loop going into the inlet of the 2nd heater would it be wise to put a check valve in on the output of the first heater. I would think that the water coming back from the return loop on a 1/2" line wouldn't have enough force to enter the first heater with the output being a 1" line but I thought cold water was "heavier" than hot and the return line is only about 20" from the outlet of the first heater. Just something I wasnt sure about.

And yes this is a dedicated return loop. All plumbing and heaters are 2 years old. The first 75 gallon heater is a much more expensive and higher quality heater than the 2nd heater if that makes a difference.

[zkirtlink]

I realize that john he mentioned he had seen the pumps mounted on the hot side outlet of a water heater I was justed giving some insight on what those systems were all about.

[zkirtlink]

I vote to leave it alone. If there was anything that you should do for this system I would say to plumb these water heaters in parallel wrather than in series. right now one is the slave to the other. it will work fine but the first unit will go out a lot sooner than the other.

[johnjh2o]

Originally Posted by zkirtlink

I realize that john he mentioned he had seen the pumps mounted on the hot side outlet of a water heater I was justed giving some insight on what those systems were all about.

Where did I say I have seen pumps on the hot side of a system with a designated return? And on the subject of pumps. They are not pumps they are circulators. They have a very small motor and all the do is create a very slight difference in pressure between the the supply and return side of the system. I have installed many of these systems with and without circulators. The best system you can have is a gravity system. It has no mechanical parts other then the check valve at the BOTTOM of the heater on the return line. The reason the return should be connected to the bottom of the heater is the water coming back from the return is colder then the water in the heater. You don't want that colder water coming into the top of the heater were it could go out into the system before being heated.

John

[zkirtlink]

the guy who is asking the questions said that he had seen the pump mounted on the top of the water heater on the hot side. currently it comes into the outlet side of the first heater and into the inlet side of the second heater through the dip tube to the bottom of the second heater. Less work involved with keeping it the way it is. Also for a home owner that is not a plumber when it comes down to a leaking water heater it will be much easier to just disconnect the top of the water heater, than to removing and replumbing the pump and return line, to the bottom.