Building A Single Zone Combi Boiler System

[@NoNo-iz8hd]

Outstanding work!

[@alonbalon12]

Hi Jay, I love your work ! Can you skip the additional external circulator on a single zone and just run as one loop with the internal circulator instead of the primary/secondary set up ?

[@JimSperanza]

Yes you can as long as you meet the minimum flow rate of the boiler..

[@LY-up3qr]

had exactly the same question. thanks.

[@jasondematos9314]

where do you get these components from like the valve kits and air separator

[@joecypress11]

Hi Jay I was a plumber for 42 years and have installed tons of tankless gas heaters but being from South Florida, I know nothing about radiant. I retired and moved to the mountains of NC and want to do radiant on my house. My first of many questions is, in these combi-boilers, do the domestic and heat water mix within the boiler?

[@JimSperanza]

No there are separate connections. Email me at [e-mail] and I can help you out.

[@karlcorre]

Hey Jim I’m looking to build a 3 zone:1st floor, 2nd floor and basement with a Rheem 199,000 BTU boiler. If you don’t mind can you please give us a list of all the parts you’re using. You should maybe use affiliate links for us to purchase. Benefits both of us! Thanks in advance ! Great videos. Thank you very much

[@JimSperanza]

Contact me [e-mail]

[@FrustratedBaboon]

Where do you order your parts and the Navien boiler or combi boiler?

[@caseyrhoads]

Does the Naveen Combi boiler require to have domestic hot water plugged in as well or can it be used on a closed loop circulating a system only?.

[@JimSperanza]

They sell heat only models as well but you can use just the heating portion of the comnbi boilers if you need to.

[@caseyrhoads]

@@JimSperanza thanks. I have to rebuild my current system. I did something wrong and I used a domestic hot water heater instead of a boiler and I'm not getting any flow on the primary loop. Kind of lost disappointed. I've got 60 hours into troubleshooting. It pays somebody $150 and he came out and told me to change the location of a pump and everything should work. This is just for my 30x40 garage but I'm really starting to get to the point where I just want to give up. I have great flow through the floor loops. I guess it's going to be next year. I'll hopefully be able to wrap this project up.

[@JimSperanza]

Email me at [e-mail]

[@roberth7559]

Hi! How did you control the pressure for the Dhw separately from the heating (70psi vs 15pso)? Did you split cold water inlet and one goes into unit and the other goes directly into return space heat?

[@JimSperanza]

The combi boilers have seperate connections for the domestic hot water and the heat. The water for both are completely isolated from each other.

[@roberth7559]

So odd to me as to why they couldn't separate within the box - I guess to continue to save space? You tapped into return space heat with 15psi?

[@JimSperanza]

The heat exchanger for the DHW is inside the unit. There are just separate connections. Not sure what you mean about the return space heat at 15 psi?

[@roberth7559]

@@JimSperanza I'm going to send you an email - thank you!

[@dempseydoodles]

Where would you install the expansion tank in this setup?

[@JimSperanza]

It connects to the air separator.

[@davidmerkrebs9967]

you're quite the technician but you put your teflon tape on wrong

[@anthonyiengo183]

Do you still use the navien manifold if your using the combo for a hydro unit

[@JimSperanza]

Yes

[@anthonyiengo183]

Where are you located

[@brokensmile8487]

Great video! I'm curious, was that the recirc inlet where you have that back flow preventer installed?

[@JimSperanza]

The backflow preventer is connected to an auto-fill feature that Naviens have that gets fed by domestic cold water and it will automatically fill the system and maintain pressure.

[@brokensmile8487]

@@JimSperanza Once again, great work. That's art work for sure. Thank you.

[@JimSperanza]

Thanks! 👍

[@soupbone320]

Jim I have the NHB-150 Navien Boiler. What the best pump?

[@JimSperanza]

The manual shows what pump to use for the primary circulator. As for the secondary the size will depend on the head loss and GPMs required for your zone. Email me at [e-mail] if you would like me to provide a piping diagram and parts list.

[@stewartdaniels9634]

Where is the magnetic filter?

[@asoteico9528]

Great !

[@reekinhavok420]

so my question is how do you use this system without domestic hot water i am building my home and we have a seperate tank water heater ? how do i use this model ncb-h . do i just plug the domestic ports up ? we are currently in the process of returning the nhb model because we dont want to use zone valves and that unit wont allow it . the only manifold navian sells for the nhb model has a required external pump please help @jim speranza

[@JoelLopez-md5es]

The one how many sqft I own three bedroom houses with a finished basement

[@andrewmiller9207]

You need a nice workbench....saves bending down...

[@JimSperanza]

Tried it and don't like it. Everything is much easier for me on the ground ti move around and over everything