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Old 07-23-2020, 02:58 PM   #1
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Boiler water temp during summer


I have a Lennox boiler with pilot light. Just for the heck of it I checked the water temperature, and it reads 120 degrees.
Is this normal? I understand that the pilot light is always on, but does it heat the water to 120?
Thanks.
On a side note, I have two zones, but I only see one purge valve. Is this possible or should I be looking for another purge valve and outlet?
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Old 07-23-2020, 03:22 PM   #2
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Re: Boiler water temp during summer


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...does it heat the water to 120?
Do you have some other water heater there?
Many boiler owners use a smll electric WH for the summer.
(and turn off the boiler)
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Old 07-23-2020, 03:50 PM   #3
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I turn mine off once the weather stays warm.
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Old 07-23-2020, 04:01 PM   #4
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Re: Boiler water temp during summer


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Originally Posted by TarheelTerp View Post
Do you have some other water heater there?
Many boiler owners use a small electric WH for the summer.
(and turn off the boiler)
The water heater is separate.
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Old 07-23-2020, 04:02 PM   #5
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Re: Boiler water temp during summer


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I turn mine off once the weather stays warm.
Does that shut the pilot also?
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Old 07-23-2020, 04:12 PM   #6
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Re: Boiler water temp during summer


Your boiler may have been set up as hot start, meaning it keeps the water warm between heating cycles and just starts the circulater.

It's possible you have an indirect tank on it but just don't know.

If it's the former, you should shut the boiler during the summer.

I can't see a pilot alone keeping the entire boiler at 120f unless it's a very small one - it's so unlikely.
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Old 07-23-2020, 07:39 PM   #7
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Re: Boiler water temp during summer


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Originally Posted by user_12345a View Post
Your boiler may have been set up as hot start, meaning it keeps the water warm between heating cycles and just starts the circulater.

It's possible you have an indirect tank on it but just don't know.

If it's the former, you should shut the boiler during the summer.

I can't see a pilot alone keeping the entire boiler at 120f unless it's a very small one - it's so unlikely.
Your boiler may have been set up as hot start, meaning it keeps the water warm between heating cycles and just starts the circulater.

How can I determine if it's a hot start?

It's possible you have an indirect tank on it but just don't know.

Not indirect. Water heater is a totally separate unit.


If it's the former, you should shut the boiler during the summer.

Does shutting the boiler power switch kill the pilot light?


I can't see a pilot alone keeping the entire boiler at 120f unless it's a very small one - it's so unlikely.

140,000 BTU input. Not sure if that's considered small. Not a very big house.
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Old 07-23-2020, 08:02 PM   #8
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Re: Boiler water temp during summer


140k is really large when it's not being used for both heat and hot water. The pilot isn't enough to keep the water as 120.

I'm not familiar with boiler wiring (much more into forced air stuff) so i can't tell you what to check in that respect, others on here know a lot more about hydronic.

If the burners cycle on without a call for heat, it's set up to stay hot.

Shutting the power will not shut the pilot but should stop the burners from coming on. You can try that to see if the boiler cools down.

In the long run you could save a lot on the heating bill upgrading the boiler - being large, standing pilot, the real world seasonal efficiency could be in the 50 to 60% range.
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Old 07-23-2020, 08:34 PM   #9
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Re: Boiler water temp during summer


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Does that shut the pilot also?
I shut off the natural gas supply line, so yes it does.
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Old 07-23-2020, 10:07 PM   #10
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Re: Boiler water temp during summer


it not necessary to shut the main gas line to shut the pilot, there's normally a knob on the valve for that.

shutting the pilot in the summer saves gas, it can be worth doing but insects/duct can get in with no flame/gas flow and clog the orifice.
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Old 07-24-2020, 07:46 AM   #11
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Re: Boiler water temp during summer


now that i think of it, 120f is low for a boiler.
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Old 07-26-2020, 05:41 PM   #12
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Re: Boiler water temp during summer


is the 120' temp an actual water temp reading, or what the gauge on the boiler says?.Ive worked on lots of boilers with bad gauges.
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Old 07-26-2020, 07:28 PM   #13
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Re: Boiler water temp during summer


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is the 120' temp an actual water temp reading, or what the gauge on the boiler says?.Ive worked on lots of boilers with bad gauges.
It's the temp reading on the gauge.
As long as the pilot light stays on I'm just going to shut the boiler power switch.
I don't want to shut the pilot. As was said on another comment, dust, bugs, etc. can get in there and cause problems. Plus I'd have to bend down and relight the pilot again when the cooler weather comes.
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Old 07-26-2020, 07:31 PM   #14
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Re: Boiler water temp during summer


Yes - shut the power and see if the boiler stays hot.
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Old 07-26-2020, 07:52 PM   #15
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Re: Boiler water temp during summer


Thanks!
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