Deep heating is a deep mystery

Adwizard

Well-known member
Oct 30, 2021
75
Cape Coral, FL
Pool Size
12000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Turbo Cell (T-CELL-5)
When our pool was built in 2014, the original owner installed a "deep heating" system. Basically, as best I can tell, it's two returns at the bottom of the pool. One in the shallow end, the other in the deep end. When the pool pump turns on, it circulates the water through the bottom jets of the pool floor. The deep jets supposedly circulate heated water more efficiently by sending the warm water up from the bottom of the pool. Now on to my problem. When I turn on the deep heating jets, only the one in the shallow end works. To get the other one to work, I have to close and open the deep heat valve several times over (to create a burst of water pressure) and then I'll notice the deep end will start to work. Usually, you will see small bubbles of air that proceeds the moment when water comes out. This morning when I opened and closed the valve several times to get things moving, quite a few large bubbles came out from the shallow end. Now both deep heating jets are working fine. I show no leaks in my pool. The water level is constant. I keep thinking it's trapped air. It might run fine for a few days without a problem but when the pool guy comes and turns off my pool motor to wash the filter, lets say, and restarts it, my problem usually starts all over again. Nothing will come out of the deep end. Only the shallow end works. So I have to close and open the valve several times again to get it circulating properly. No problems whatsoever with the sidewall return jets. My pool guy thought maybe there's an obstruction. But hed need to see the scematics of the piping underground. But if an obstruction, how come I can keep getting it to work again? No debris is coming out of either deep heating return. Turning the valve off and on over and over once a week isnt a good solution. If trapped air, where is this air coming from? A head scratcher for me. Any ideas? Thanks.
 
What does these bottom jets look like? Are they full open like the side wall returns? Are they spring loaded caps that need to be pushed open with water flow/pressure? Are they small diameter jets like would be in a spa jet?
Debris would be my first guess if it is spring loaded or a small diameter jet.
Have you tried to remove the jet from the bottom?
 
What does these bottom jets look like? Are they full open like the side wall returns? Are they spring loaded caps that need to be pushed open with water flow/pressure? Are they small diameter jets like would be in a spa jet?
Debris would be my first guess if it is spring loaded or a small diameter jet.
Have you tried to remove the jet from the bottom?
As far as I know, they are not spring loaded jets. You don't open or close them. They are always "open". However, I have never removed the jets and poked my fingers in there to probe or ran a snake through anything. That might be my next step. Maybe I'll run into something that is blocking it. Thanks.
 
As far as I know, they are not spring loaded jets. You don't open or close them. They are always "open". However, I have never removed the jets and poked my fingers in there to probe or ran a snake through anything. That might be my next step. Maybe I'll run into something that is blocking it. Thanks.
It may just be that the back pressure from the deep end jet forces most of the water to the shallow end jet.
 
The “Deep Heating” is mostly a gimmick that stirs the heated water around the pool a bit.

Your plumbing probably has a bend that is trapping a big air bubble when your pump is turned off. Then you need to clear the air bubble before water can flow again to the deep return.

Not much you can do about it now. You know what to do if you want to get that deep return flowing. Your pool will operate fine without it flowing.
 
When our pool was built in 2014, the original owner installed a "deep heating" system. Basically, as best I can tell, it's two returns at the bottom of the pool. One in the shallow end, the other in the deep end. When the pool pump turns on, it circulates the water through the bottom jets of the pool floor. The deep jets supposedly circulate heated water more efficiently by sending the warm water up from the bottom of the pool. Now on to my problem. When I turn on the deep heating jets, only the one in the shallow end works. To get the other one to work, I have to close and open the deep heat valve several times over (to create a burst of water pressure) and then I'll notice the deep end will start to work. Usually, you will see small bubbles of air that proceeds the moment when water comes out. This morning when I opened and closed the valve several times to get things moving, quite a few large bubbles came out from the shallow end. Now both deep heating jets are working fine. I show no leaks in my pool. The water level is constant. I keep thinking it's trapped air. It might run fine for a few days without a problem but when the pool guy comes and turns off my pool motor to wash the filter, lets say, and restarts it, my problem usually starts all over again. Nothing will come out of the deep end. Only the shallow end works. So I have to close and open the valve several times again to get it circulating properly. No problems whatsoever with the sidewall return jets. My pool guy thought maybe there's an obstruction. But hed need to see the scematics of the piping underground. But if an obstruction, how come I can keep getting it to work again? No debris is coming out of either deep heating return. Turning the valve off and on over and over once a week isnt a good solution. If trapped air, where is this air coming from? A head scratcher for me. Any ideas? Thanks.
Probably there is return at the deep end that isn't very apparent.
It has never been shown that having "deep heat" returns make any significant difference in heating a residential pool, especially one with good circulation. If you have adjustable "eyballs" at the return fittings, facing them slightly down while heating will accomplish the same thing, and if there are more than two, allow for better water circulation
It can be frustrating to have something that doesn't appear to be working, but this item is one that shouldn't cause a lot of concern.
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.