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Old 03-02-2013, 04:45 PM   #16
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No hot water in shower


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if there was hot water in the sinks then it was producing hot water. I have not yet ruled out cold water cross over.
It could be a hot water heater volume issue. Sink output is significantly less than a tub or washing machine. So you get hot water from the sink but not enough when you need a lot of it.

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Old 03-02-2013, 04:56 PM   #17
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No hot water in shower


If you have a recirculating system you will usually find a pump on your ho twater line by the tank.

Do you have single handle faucets in your sinks and what brand.
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Old 03-02-2013, 05:24 PM   #18
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No hot water in shower


I don't see a pump near the hot water lines. There is a single handle faucet in the kitchen but I'm sure what kind, there's no brand written anywhere.
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Old 03-02-2013, 05:38 PM   #19
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No hot water in shower


Please post the make and model of your tankless. I'm thinking it fires in stages depending upon demand and it's not working right. Or it's something simple like the temperatue setting was changed and is too low.
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Old 03-02-2013, 05:52 PM   #20
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No hot water in shower


Utica SFH3100ST. It's an all in one furnace/hot water.
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Old 03-02-2013, 05:55 PM   #21
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No hot water in shower


Also, about the temperature settings. The hot water was set at 212 degrees when I first moved in. There were still no hot showers but they were slightly warmer than they are now. The temperature has been turned done to 180 as there were overheating issues in the upstairs and to conserve oil. I assume the previous owner was compensating for lukewarm showers as well.
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Old 03-02-2013, 06:06 PM   #22
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No hot water in shower


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Also, about the temperature settings. The hot water was set at 212 degrees when I first moved in. There were still no hot showers but they were slightly warmer than they are now. The temperature has been turned done to 180 as there were overheating issues in the upstairs and to conserve oil. I assume the previous owner was compensating for lukewarm showers as well.
Wow! I believe the safe range is 120 for a water heater. I couldn't find anything on the 3100ST just 3100WT. Says it puts out 3 1/2 GPM of hot water.

Sounds like a pre-existing condition. I would rule out cold water crossover. After that I'm out of ideas short of calling in your boiler technician to see if the tankless is properly working.
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Old 03-02-2013, 06:45 PM   #23
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No hot water in shower


Well thank you for all your help. I think you're right about needing a technician at this point. I was told it needed to be at 180 for baseboard heating but I will look into that.
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Old 03-02-2013, 07:08 PM   #24
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No hot water in shower


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Well thank you for all your help. I think you're right about needing a technician at this point. I was told it needed to be at 180 for baseboard heating but I will look into that.
You probably have two thermostats. One for the heating boiler which is the 180 degrees and a separate one for the tankless water heater. Not knowing the unit maybe there isn't a thermostat for the tankless.

Please post back when you get this resolved. I'd love to know the problem.
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Old 03-03-2013, 11:08 AM   #25
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No hot water in shower


No answer yet, but another piece to the puzzle is that the water pipe (coming out from the mixing valve) is hot when no one was using the hot water and the furnace was off. When the downstairs shower was turned on (it ran hot water for maybe 30 seconds before getting colder) the pipes went cold and stayed cold for several minutes after the shower was off before getting hot again.
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Old 03-03-2013, 11:38 AM   #26
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No hot water in shower


Just a guess. The mixing valve is bad or is not set correctly.

I'm making the assumption that there's no temperature control for the tankless so the mixing valve mixes cold water to bring the hot water temperature (180 degrees) to a safe level.

If there is a shutoff valve before the mixing valve, try closing it and see if it does anything to the hot water at the fixtures.
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Old 03-03-2013, 03:32 PM   #27
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No hot water in shower


Well the mixing valve is brand new- it was replaced in January. I'll look for a shut off valve.
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Old 03-12-2013, 05:26 AM   #28
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No hot water in shower


It looks like it's the hot water coils. They will either need to be replaced, but a separate hot water heater tank or replace the furnace.
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Old 03-12-2013, 08:23 AM   #29
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No hot water in shower


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It looks like it's the hot water coils. They will either need to be replaced, but a separate hot water heater tank or replace the furnace.
Bummer. If you're going to be in your house for a while, it probably makes sense to upgrade your 84% boiler to a high efficiency one.

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