Navien Combi Water Heater

Navien Combi Boiler Weekend Home

Navien Combi Water Heater

At first glance I was taken back a little by the material being used in this water heater system. I have never seen black rubber hose being used in a in-floor application. It was not only the rubber hose being used but the size of the hose, 1/4" Id just does not seem like a lot of surface area to me for in-floor.

Existing Black Rubber Hydronic Hose

Existing Black Rubber Hydronic Hose

The black hose simply pushed into the copper pipe to make a manifold, the pressure of the system keeps its sealed. My research concludes that 45psi is the max these connections could hold back. We are running 12 to 20 psi.

Older Combi core HWT

Older Combi core HWT

  Here you can see the older Combi-Core water tank that was used to heat both their domestic as well as there hydronic heat. The mixing valves being used appeared faulty and both expansion tanks where bad.


Navien Combi Water Heater ... cont.

Navien has really out done themselves in my book with the Navien Combi Water Heater. This unit not only heats your domestic water, but also heats your home ... all in the same box.

New Navien CH-240 Water Heater

New Navien CH-240 Water Heater

 The Navien CH-240 tankless bolted right up on the exterior wall and really was plug and play, well of course we had to build a primary manifold and modify the existing loop to be a secondary loop ... but not to complicated.

 We controlled the Navien Combi Water Heater boiler system with the new ecobee Wifi thermostat, this way my customer can change thermostat settings from a remote location. And this being a weekend home it will work out great.



May 27, 2015 at 6:05 am

These are some great shots. I should really take more picture on my installs. 😉

Bill Johnson said:

June 7, 2015 at 10:01 pm

Looks great, I have been researching the Navien for my house. I will be calling you guy’s soon.

S K said:

December 13, 2016 at 9:36 pm

I recently got a Navien NCB-240E installed but unfortunately when I got it done I did not get an Ecobee. Now I just got the Ecobee and I can’t find how to wire this. I currently just have a red and white wire to my simple (heat only) thermostat. What do I need to install the Ecobee to work with the Navien??

Thanks! Your site is the ONLY one I could find that proves the Navien can be used with the Ecobee!

Gary Kirkendall said:

January 23, 2017 at 1:07 pm

The Navien has a dry set of contacts to turn the unit on or off. “T T” is your landing points. Do not apply voltage to these terminals. The ecobee I used had ability to do this at the board… look at your wiring diagam.


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