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# Boiler Water Temperature

#1
01-24-04, 07:20 PM
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Join Date: Apr 2003
Location: USA
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Boiler Water Temperature

What temperature should a hot water boiler normally be set to? According to the gauge on my boiler, at times the water gets up to about 205 degrees. That is only 7 degrees short of boiling!
I should add that everything seems to be working fine, and it maintains a constant pressure of 15#'s in a two-story house. The boiler is an gas- fired American Standard from about 1974.
Anyone have any input on this?
Thanks!

#2
01-24-04, 07:43 PM
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Join Date: Oct 2003
Location: Davenport, Iowa
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I have one idea. The boiling point of water depends directly on pressure. Water subjected to 14.696 absolute pressure (standard atmospheric pressure) will indeed boil at 212 degrees F. Since you state that the pressure inside your boiler is about 15 pounds gauge pressure (about 30 pounds absolute) the boiling point of water is closer up 250 degrees F. I can't state what the normal temperature or pressure should be, but can only state that you aren't close to boiling any water.

#3
01-24-04, 07:43 PM
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Location: Rochester, Minnesota
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The boiler temp should be on at 160, and off at 180. OVer that is a waste of fuel, and too danger to have it near boiling point.

#4
01-24-04, 07:53 PM
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Join Date: Dec 2002
Location: Easton, PA
Posts: 3,245
If it makes your domestic hot water too, there would be 2 settings. A Hi and a Lo pointer. The low temp is the temp that the boiler normally runs at. The high temp is the temp the boiler trys to achieve when there is a call for heat. Like Jay said, the lower you can keep it set the better off you are. As long as you don't push the high one over 200 degrees F. you are in the ballpark. If you can set it at 180 and get by, I would suggest it.

#5
01-25-04, 08:22 PM
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Join Date: Apr 2003
Location: USA
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This boiler is for house heating only. I better set it down to 180.
I religiously clean and maintain this boiler every season, and I don't recall seeing any adjustment other than the high limit. I'll look tomorrow, since it's late.
Thanks again, you guys are really a good bunch of professionals

#6
01-26-04, 09:38 AM
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Location: Easton, PA
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If it is for heat only, it probably only has a high limit. There is no need to maintain water temperature without a call for heat in your system.

And 180 would be a better temp for high limit.

#7
01-26-04, 10:39 AM
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Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 18,389
boiler

I saw two story home. If true two story home at 15 psi on the boiler. You do get water out of the top bleeder there all the time dont you? ED

#8
01-26-04, 08:13 PM
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Join Date: Apr 2003
Location: USA
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K field- Just checked the actual setpoint on the high limit, and it is set for 180. Should I be concerned about the high readings on the gauge, or could the gauge be wrong? Am I just worrying too much?
Ed- I do have pressure on the baseboards upstairs. Not exactly a gusher, but just enough to get the job done.
Thanks, guys!

#9
01-26-04, 08:26 PM
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Location: Easton, PA
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Usually the control is more accurate than the gauge but either way, you are OK.

#10
01-27-04, 09:04 AM
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Join Date: Apr 2003
Location: USA
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Thanks!
Although I usually do my own service on it, I plan to have the boiler completely inspected next fall by a reputable HVAC outfit, Just to be safe.
Thanks again

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