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Old 10-18-2010, 08:40 AM   #1
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Why does my oil boiler maintain heat?


I have an early '90s Weil-McLain oil-fired boiler (not sure the model). My 50's cape, though not well-insulated, is brick...so it holds heat fairly well.

All day my boiler turns on to maintain it's temperature (right now i have it set to 120/140). Is there a way to wire the thermostat so that the boiler only maintains temperature while the system is calling for heat? Seems like a real waste, especially since it only takes minutes for the system to get up to temperature.

Also...I know outdoor reset controls can change the internal temp of the boiler based on outside temp. Since I don't want to put money into this old boiler, I am doing it manually. Is there some sort of chart that shows the appropriate boiler temp based on outside temp?

Oh I should also mention that my one zone has cast iron radiators on the first floor, and tube & fin baseboards on the second floor. I know this is a no-no (my upstairs never seems to get warm). I do plan to fix it in the future by adding a secondzone, but since I rarely go upstairs, it is not a top priority.

Thanks.

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Last edited by secutanudu; 10-18-2010 at 08:42 AM.
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Old 10-18-2010, 06:58 PM   #2
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Why does my oil boiler maintain heat?


Did your boiler at one time provide you with your potable hot water? If so, then its maintaining temp because it is still hooked up to do so.

If you no longer get your hot water from it. Set the low limit as low as it will go. And leave the high limit at 180 or where ever it was.

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Old 10-18-2010, 07:26 PM   #3
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Why does my oil boiler maintain heat?


My hot water pipe does coil through the boiler. I think the minimum is 120...I will put it down to that for the min.

WHat about lowering the max when it is warmer out?
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Old 10-19-2010, 05:08 AM   #4
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Why does my oil boiler maintain heat?


If your getting your hot water from the boiler. 120 may be too low then. Try it. And if your water isn't hot enough. Then raise it to 130, and check again.

Might try using 160 for your max temp. See if its hot enough for your coldest days when you get those temps.

I'd get an electric water heater, and stop using the boiler for hot water.
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Old 10-19-2010, 07:39 AM   #5
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Why does my oil boiler maintain heat?


Ha, I forgot to mention....this house used to use the boiler coil for hot water. I do have an electric water heater. I must have been half asleep when i made my last post.
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Old 10-19-2010, 04:46 PM   #6
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Why does my oil boiler maintain heat?


LOL...

Just turn it to the lowest temp sitting it has on the low limit. That could be 100. It will still maintain temp. In the winter, its nice to have a little temp in the boiler. In the summer, just turn the power off to it.

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