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Old 03-18-2017, 07:54 PM   #1
bigdog
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Default Hot water issue - furnace ?

I've been having hot water issues in both my showers, and thought it may be related to the mixing valve in the Delta handle.

I decided to pull in a plumber to diagnose the issue. Much to my surprise, he didn't believe the issue was related to the mixing valve, but related to the furnace !

He checked the furnace, and the hot water pipe coming out of the boiler,
which feeds the house with hot water, and it was only warm to the touch, and he said it should be so hot you shouldn't be able to touch for long.

His diagnosis, was the coil in the boiler was 'toast' ! Furnace is 30 yrs old.
Installation is basically removing 4-5 bolts on a plate, removing and replacing the coil, and reassemble. Didn't have performed at the time.

Does this sound like the 'coil' is the root cause ?
If so, how much time should it take for replacement ?
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Old 03-18-2017, 08:11 PM   #2
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He is probably correct, I would have your furnace guy check it for a 2nd opinion.
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Old 03-19-2017, 09:02 AM   #3
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How is the hot water in the rest of the house? If it's fine, then the coil isn't the problem. Also check your mixing valve, there might be a buildup in it.
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Old 03-19-2017, 09:48 AM   #4
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Thanks to all who have responded to my thread here !

I was also planning to have my furnace/oil dealer check out the issue.

Rest of house water from faucets coming out hot. but the washing machine
water start hot then goes to lukewarm within a minute or two.

That said, I still think the issues is related to the furnace, not being able to keep up with the demand.
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Old 03-19-2017, 10:28 AM   #5
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Quote:
Originally Posted by bigdog View Post
Thanks to all who have responded to my thread here !

I was also planning to have my furnace/oil dealer check out the issue.

Rest of house water from faucets coming out hot. but the washing machine
water start hot then goes to lukewarm within a minute or two.

That said, I still think the issues is related to the furnace, not being able to keep up with the demand.
Had the same problem. Mine turned out to be the burner controller, it was waiting far to long to kick the burner on. Initially I attempted to screw with the temp adjustments but it didn't do a damn bit of good. In fact right before I replaced it - the burner would fail to start so I'd have to manually reset the burner. Replaced the controller and all was good. Before I did that however I did check to ensure the temp controller was operating correctly. Simple to do with a multi-meter.

My furnace has a Beckett burner. New controller was about $70.00 at FB Webb. In fact before I bought it I talked to the guys down there just to make sure I wasn't missing anything. They have some good knowledgeable folks working there. As it turns out the controller I had (brought in the part number with me) was known to be problematic and the new controller I got was updated one that supposedly addresses several problems. So far so good, in fact I've noticed that the false starts I had been getting pretty much since day one are no longer occurring. That should have been a clue there was a problem but at the time I figured since it was intermittent that it was normal behavior.
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Old 03-19-2017, 01:07 PM   #6
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Default Burner Control

Thanks MAXUM for the tip about 'burner control' !

When I have furnace tech review, I will mention the burner control as the possible issue... TBD
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Old 03-22-2017, 01:43 PM   #7
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You say you have hot water at other points but the washer soon gets cooler. Before I assume its the coil run the other water points that seem fine for a while and see if they cool down. If so then I would suspect your coil could have caked up minerals that keep it from exchanging the heat from the boiler water to the hot water feed. I've replaced mine and it was very simple. In my case the boiler water pressure kept getting too high and the relief valve would open. Turns out I had a leak in that coil that would allow the higher water pressure to enter the lower pressure boiler water chamber. Easy fix though.
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Old 03-22-2017, 03:19 PM   #8
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Quote:
Originally Posted by bigdog View Post
I've been having hot water issues in both my showers, and thought it may be related to the mixing valve in the Delta handle.

I decided to pull in a plumber to diagnose the issue. Much to my surprise, he didn't believe the issue was related to the mixing valve, but related to the furnace !

He checked the furnace, and the hot water pipe coming out of the boiler,
which feeds the house with hot water, and it was only warm to the touch, and he said it should be so hot you shouldn't be able to touch for long.

His diagnosis, was the coil in the boiler was 'toast' ! Furnace is 30 yrs old.
Installation is basically removing 4-5 bolts on a plate, removing and replacing the coil, and reassemble. Didn't have performed at the time.

Does this sound like the 'coil' is the root cause ?
If so, how much time should it take for replacement ?

The Plumber is correct, mine does the same thing. I have to replace my coil every 2 years or so.
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Old 03-22-2017, 04:01 PM   #9
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Quote:
Originally Posted by Formula260SS View Post
The Plumber is correct, mine does the same thing. I have to replace my coil every 2 years or so.
This must be an oil burner. I have a Celtic natural gas boiler and have the original coil. Installed in 1978
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Old 03-22-2017, 08:24 PM   #10
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BroadHopper,

You are correct, I have an oil fired boiler, with Becket burner.
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Old 03-23-2017, 03:05 PM   #11
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Really shouldnt matter what the boiler water is heated with cuz neither flame enters the boiler water. Its more of a function of water chemistry.
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