Navien NCB 240-E - Low Temperature

[raptor235]

Hi,

Found this forum on google and seems like a great resource.

We just moved into a new house and our water temperature never seems to get very hot... it's warm... but not hot... I've maxed out the settings but it's just not getting to the required temperature.

I have the unit set at 180 F which should be 82 degrees celcius but when I used a air thermometer I'm only showing 40 ceclius in multiple locations in the house.

We do have heater floors as well and the floor seems not cold in the basement but also you can't really tell that they're heated.

I've been over the settings in advanced menu and I don't see anything that seems out of order.... water pressure is at around 18psi...

I'm not sure if I maybe try to reduce the water pressure if that could help.. but it's very frustrating moving into a brand new house and not having very hot water..

I tried reducing the pressure through valves coming out of the unit and also just running the hot water slower and also just shutting cold water completely off to one of the bathrooms which didn't help at all...

Is there any specific direction I should be looking to help improve this?

Thanks so much in advance for any help.

 

[Fitter30]

Heres a manual if you don't have one pages 54- 55 adjusting temps for heating and dhw
https://www.manualslib.com/manual/1058172/Navien-Ncb-150e.html
Radiate heated floors 5* - 10*f over setpoint of thermostat. Dhw 120*f
Take a few pics of heater and piping, pumps and expansion tank. How many thermostats do u have in the house?

 

[Sponsor]

 

[raptor235]

Hi Sorry for the delayed response and thank you for responding... here are some pictures of the heater along with settings...

https://drive.google.com/drive/folders/1S6V6TJJUkY4OABSxFccL6QLERShSdzjC?usp=sharing

I only have one thermostat, but it shouldn't have anything to do with the water heater... I don't think.

 

[Fitter30]

Your writing about the radiate floor heat not domestic hot water? This thermostat is this for heating not dhw. What brand and model number of stat ( should be inside front cover or subbase )

 

[John Gayewski]

Your domestic water pressure is 18psi?

 

[Jadnashua]

Once a radiant floor's space is up to temperature, you don't want the floor to become hot. The only time it might need to be hot is if you had a big setback, or you have totally inadequate insulation. Not cold is ideal for a radiant floor once the room is to temperature. Radiant floor water temps rarely need to be over 130-degrees, as that temperature would be too hot to touch comfortably if the floor ever got there.