Problems with baseboard heat reaching 2nd floor


Old 01-12-16, 10:41 PM
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Problems with baseboard heat reaching 2nd floor

I recently purchased a house with baseboard heat. This is my first house with baseboard, so I do not know much about it - but I am trying to learn.

There is only one zone. The boiler is in the basement. The main problem is that I cannot properly get heat to the 2nd floor. The first floor works fine. I added a valve to the first floor which allows me to turn off the first floor, forcing the water to go to the 2nd floor baseboards (also allows me to make sure the 2nd floor is being purged). The second floor then works fine. But once I open the first floor valve, all water stops going to the 2nd floor.

I have purged the system dozens of times.
I just replaced the circulator pump, which did not help.

I am thinking maybe I found the problem, but I could be wrong. When the thermostat reaches the set temperature and turns the system off, I can clearly hear all of the water draining downward out of the pipes. Should this be happening? It seems to me that would be introducing a large amount of air into the system. Shouldn't the water just sit still in the pipes once the system is turned off? When the system turns back on, I can definitely hear a large amount of air/bubbles throughout all of the pipes for about 30 seconds. I believe it is pushing that air to the 2nd floor.

Any input would be appreciated.
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Old 01-13-16, 03:17 AM
lawrosa's Avatar
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There should be no air in the system..

Post temp gayge and pressure reading of boiler ..

Post make and model.

Okease post a few pics of the system and piping. Show us this valve you installed also..

Is this cast iron baseboard or finned copper tube?

Lets start there...

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