Hot water recirculator

Shrute

Can you people stop fighting?

Are there any real professionals here?

Scuba_Dave

I suggest the professionals stop the name calling & arguing
If you can't then find another site

Discussion is OK
At least 2 people have already been warned about the consequences of violating the Posting Rules

My Non-Pro understanding: Heated air rises, cooler air sinks
Hot water rises, cooler water sinks
But if the run is too great VS the rise then the effect may not be that great

SULTINI

That's a real good question plummen.

Shrute Maybe a pro will answer your question for you if you don't like the answers already provided by some Pro's.

I hope to hear from other people then we'll all learn something.

We can all do what post #16 states.

Shrute

My curiosity is about the circulation system that works by connecting under the sink and pumping the hot water back thru the cold water pipe.

If anyone has any professional opinion on that system I am all ears.

However, if people want to argue like children over completely different systems, I simply ask that you do so somewhere else.

nap

once the dust settles



there is such thing as a gravity or thermal powered hot water recirc system. Some of the guys may be more familiar with it when they think about it in terms of hydronic heating systems as it has been used in such systems for a long time.


there are also pump driven recirculating systems.


there are design basics that must be followed for a gravity feed system to work well. I lack the knowledge and training to be able to provide those requirements.

From what I understand plummens picture would not work very well, if at all due to the very limited high point and it's location.. The natural flow due to the thermal differences may not be great enough to cause circulation but again, I really could not say for sure. From what I have been reading is the end of the loop needs to be the highest point of the hot water run.

plummen

that was just a picture i found to give a general idea of how system is tied together,id prefer to find a picture of a system with the heater mounted lower but thats all i could find.
Ill be happy to take a picture of a sytem without a pump next time im working on one to illustrate how it actually works.it doesnt work in all conditions but it is possible in many cases

Scuba_Dave

Shrute I am sorry for the problems that have occured on this thread
We do have some good people who are here to help out
I can assure you you will not be receiving another PM like you just did

Thread re-opened

SuperPlumberGuy

Google "gravity hot water loop" If piped correctly it will work because it has to.
The laws of physics win every time.

Shrute

Ya know what, nevermind...

SuperPlumberGuy

Sorry for going off topic ....To answer your original question, the undersink units you are asking about do work and depending on how the plumbing under your sink is set up they are usually very simple to install plumbing wise. The drawbacks are sometimes having to wait for cold water and depending on your situation it can sometimes be a hassle getting power to the unit......Good Luck

madone_de_mia

This thread came up in my search term "hot water circulation". I know this thread is old, but my search was not - and I have to say that it answered the "no-pump" question I had.

I also wanted to add something that surprisingly no one mentioned, as well as a working example that can be found in just about every kitchen in America as a testament that it really does work well.

I will add it in the form of a question, and see if anyone knows the answer...



Which common appliance found in most US kitchens that uses the very same system as described by plummen in this thread?

TheEplumber

I started to read this thread but I gave up. This thread looks too dangerous. So I have no idea what plummen's system is.

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madone_de_mia

My apologies, I didn't think of it that way, but now that you mention it...

The answer is a drip coffee maker.

The rest is a give...

I am going back to designing my wood fired water heater and circulation system now fully understood.


Peace.