Hydronic piping

RMA

adding a zone to my basement off a navien combo. I piped the first floor circuit style similar to a radiant system.

Instead of piping a continuous loop and dealing with trapped air, I’m considering the circuit style or a mono flow style. 3/4 main in basement ceiling dropping to baseboard in basement.

just wondering what thoughts are out there.

Also pumping away!!!

Thanks,

Rick

4GenPlumber

Dont mono flow a basement zone that drops below the main. The pressure differential doesnt always work when they are dropped. Just pipe them in a series and long as you are pumping away with a decent air eliminator you will be fine.

RMA

even if I use two mono flow tees wide spread at each piece of baseboard?

EdTheHeaterMan

Have you used the proper design criteria from the manufacturer to select the proper fittings and pump to make this work. You don't just put them in and hope it works. Here are the original and current design guides https://heatinghelp.com/assets/documents/57.pdf and B&G Monoflo Design guide

You are better off with a series loop on baseboard as long as you have less than 65 feet of radiator fin on that loop. Also try to keep the total pipe length below 200ft. Up and down and up and down several times with all those elbows will add significant equivalent length to the loop. That may send you into the bigger pump size in order to get the water to move properly.  

kcopp

You think a series loop on baseboard has air issues… do a monoflow set up and you will have air issues in spades.

Add a proper purge set up w an air separator and you will be fine.

hot_rod

how many fin tubes are you considering?

1/2” pex with a manifold system is an easy retrofit and gives you unlimited zoning potential. In some cases 3/8 tube is adequate