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Old 01-14-2009, 06:15 PM   #16
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boiler undersized? or oversized


The boiler was replaced in 2000 the old boilers burner was bad and kept clogging the tubes with suit. The new boiler says 140000 btu input 117000 output.What got me wondering though is ARS didnt even inspect my crawl when they recommended the new unit

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Old 01-14-2009, 06:34 PM   #17
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boiler undersized? or oversized


They probably just put the same size back in.

They don't care how much fuel you use.
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Old 01-14-2009, 07:06 PM   #18
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boiler undersized? or oversized


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Forced air homes of 1000 sq ft sometimes have 125k furnaces cause that was all the hvac contractor had on hand. Could be the same for the boiler too.

I installed a humidifier once in a 1500 sq ft home that used the furnace to heat the main floor and and a 150k boiler to heat the basement and a small addition.. With the basement door open and the boiler firing it heated the home like a gravity furnace. The forced air furnace seldom cycled.
And he claimed to sell industrial boilers before retirement.

Ray Charles musta sized his home boiler for him
Must have been sized for 98deg indoor at -145deg outdoor temp Sounds perfect to me
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Old 01-14-2009, 07:16 PM   #19
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boiler undersized? or oversized



drdon51

When did this problem start? After the new boiler or just recently.
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Old 01-14-2009, 08:00 PM   #20
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Must have been sized for 98deg indoor at -145deg outdoor temp Sounds perfect to me
Guy musta sold boilers on Pluto, 'ya think?
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Old 01-14-2009, 08:03 PM   #21
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boiler undersized? or oversized


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Guy musta sold boilers on Pluto, 'ya think?
Starting to get a little chilly here in Chicago. We can use a couple of extra btu's rite about now.
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Old 01-14-2009, 08:09 PM   #22
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boiler undersized? or oversized


The house has always been hard to heat. The bedrooms have 3 foot runs and every room is at least 5 degrees cooler than the main room,so when its really cold and I can only get the house up to 67 its like 62 in the bedrooms. This only happens when the temp is below 0
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Old 01-14-2009, 08:15 PM   #23
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boiler undersized? or oversized


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The house has always been hard to heat. The bedrooms have 3 foot runs and every room is at least 5 degrees cooler than the main room,so when its really cold and I can only get the house up to 67 its like 62 in the bedrooms. This only happens when the temp is below 0
What type of heating units do you have? Copper tube baseboard or cast iron or something els. 3Ft is not a lot for a room.
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Old 01-14-2009, 09:24 PM   #24
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boiler undersized? or oversized


copper tube baseboard---Ok I shut off one run into the crawl,got some air for awhile then went away.The boiler is holding its heat a lot better,but now my low has moved from 130 degrees to 145 degrees and the high moved from 170 to 180,also once in awhile when the stat kicks off the boiler continues to heat to the high point.I shut off the small 30 ft run --Im thinking about turning that one one for the crawl and shutting down the 60 ft run.Do you think a 30 ft run in the crawl would keep it above freezing
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Old 01-14-2009, 09:35 PM   #25
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copper tube baseboard---Ok I shut off one run into the crawl,got some air for awhile then went away.The boiler is holding its heat a lot better,but now my low has moved from 130 degrees to 145 degrees and the high moved from 170 to 180,also once in awhile when the stat kicks off the boiler continues to heat to the high point.I shut off the small 30 ft run --Im thinking about turning that one one for the crawl and shutting down the 60 ft run.Do you think a 30 ft run in the crawl would keep it above freezing
No way for us to know if it will freez or not this is your choise. 3 feet of baseboard you say is in the rooms is the amount of baseboard normally in small bathroom. Is the baseboard in the crawl under the rooms with the short baseboards? This may be suplimental heat for these rooms.
Additionally you say you got air out of the lines. Make sure the air is out of all lines as this will affect the heat output.
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Old 01-15-2009, 05:42 AM   #26
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3 foot of copper baseboard, is anywhere from 1500 to 1800 BTUs on average.

I'd say, you need some more baseboard in those rooms.
most likely, you need some more baseboard in the rest of the house also.

Proper way to solve this.


Have a competent, company come out and do a load calc on your house, so they can tell how much baseboard each room needs.
Pay them to install the proper amount of baseboard.
And to adjust how much baseboard is in the crawl, to keep it above freezing in the winter, but not 70.

Not 100% proper way.

Have a higher head circulator installed(preferably 3 speed)
Increase boiler water temp to 210 to 220(its under pressure, so don't worry about making steam).

The first method cost more upfront.
The second method uses more fuel for the life of your system.
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Old 01-15-2009, 10:29 AM   #27
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boiler undersized? or oversized


Thanks for the info I agree it needs looked at by someone with a little expertise. This morning its -6 and my boilers circulating pump is running constantly with regular boiler cycle and my house is 65.
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Old 01-15-2009, 12:52 PM   #28
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boiler undersized? or oversized


If your boiler is cycling on limit it has more heat to give you need more baseboard. Or like sead earler you can turn the limit up to 200 or so to get more btu's per ft of bsbd as a tempoary solution.

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