DIY Home Improvement Forum banner

1 - 20 of 25 Posts

·
Registered
Joined
·
15 Posts
Discussion Starter #1
I just bought a house and the bank I bought it from hired a plumber to install a boiler. I had some say in the matter but was ultimately advised to go with a Laars Endurance due to some direct venting issues. I had no problems with the boiler until it started getting cold out (below45). Once that started happening I noticed the base board wasn't putting out much heat, I can set the thermostat to 90 degrees and the room one get above 54 on a bad day and 63 on a good day. There has been an occasion or two when the temperature has reached 68-70 so the system is capable of heating the area its just most of the time it doesn't. I called the company that installed it(who I don't trust farther than I can throw them) and they told me that the pex feeding the base board was too small, ½ opposed to 3/4, and that I needed more base board. But I was told that Half inch pex has the same flow as 3/4 copper because there are no fittings and like I said the system can Heat the whole area at times so I don't think I need more baseboard. I have a digital thermostat and which I have programed and reset and reprogrammed to make sure that wasn't the issue. My next thought ist to bleed the system but I'm not quite sure how to do that. Any suggestions? sorry the post is so long
 

·
Registered
Joined
·
428 Posts
Man were to start. I could be sooo many things. 1st 1/2 pex is not the same as 3/4 copper. Has it heated to normal temp when it was cold out or only when the weather was mild.
 

·
Registered
Joined
·
15 Posts
Discussion Starter #5
continues to work as long as the digital thermostat is set above the current temp. My gas bill was$180 last month
 

·
Registered
Joined
·
428 Posts
If it continues to operate then it is giving up all the heat the boiler is putting out. Check that the boiler is firing at full rate.
 

·
Registered
Joined
·
15 Posts
Discussion Starter #7
You'll have to bare with me I have no HVAC experience what soever. What I do know is that the digital read out for the tank temp 190 degrees and my hot water works extremely well
 

·
Registered
Joined
·
428 Posts
Hopfully the 190 is the boiler water temp and not the domestic water. If you are delivering 190 deg water to the heating system and the burner dosent shut off then it sounds as if the boiler is to small except for the fact you say it has heated durring the same cold weather otherwise. Maby others can think of somethin els.:wink:
 

·
Registered
Joined
·
15 Posts
Discussion Starter #9
no my domestic is set around 140-150, i have no small children and i think my wife is smart enough not to put her hand in scalding hot water
 

·
Registered
Joined
·
15 Posts
Discussion Starter #10
Please excuse my mis use of terminology but I read some where that the heat exchange can get clogged with air?
 

·
Registered
Joined
·
428 Posts
Nah if is was air bound it would be cycling on high limit. Are you sure the burner (fire not pump) continues to run when the house is cold and not able to keep up.
 

·
Registered
Joined
·
428 Posts
Ok so the burner does cycle off when the house dosent maintain temp. This says it is not the boiler itself. what type of heat emitters are in the house. Copper tube baseboard?
 

·
Registered
Joined
·
15 Posts
Discussion Starter #14
copper fin baseboard fed by pex on the first floor the second floor is a heat pump fed by pex and that work great
 

·
BUILDER / REMODELING CONT
Joined
·
1,543 Posts
dont want to but heads on this post, but I would say the system was choked by the 1/2 Pex. going from 3/4" to 1/2" on the first floor I would have to say your choking the zone. BOB.
 

·
Registered
Joined
·
428 Posts
dont want to but heads on this post, but I would say the system was choked by the 1/2 Pex. going from 3/4" to 1/2" on the first floor I would have to say your choking the zone. BOB.
1/2" can feed 3/4 baseboard but only so much of it. We dont know if a single loop or how many feet of baseboard the loop has on it yet. Sooo may things still to determon and almost bed time for this old man
 

·
Administrator
Joined
·
39,650 Posts
½" pex, doesn't have the same flow rates at the same head pressure as ¾" copper.

You probably have a Taco 007 or equivilent circulator.
Its probably too small for the GPM you need.

You need someone to come out, and check the head the circulator is working against. And to check temp rise through the boiler.
 

·
Registered
Joined
·
15 Posts
Discussion Starter #20 (Edited)
sorry for some reason I didn't see the other posts. My best guess is the second floor which also has AC has 5/8 pex runn up to the attic which heats a coil and a fan that blows the hot air to each room. This system work great its very responsive and it holds a constant temp. The down stair is 1/2 in pex fed to about 40' of base board on a single loop
 
1 - 20 of 25 Posts
Top