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Old 12-07-2009, 09:00 AM   #1
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hot water problems.


Having a problem with hot water to my shower, it seems that after 4 - 5 mins the hot dies down and the show water gets warm. I don't have any problems with my bathroom sink or kitchen sink with hot water just my shower. I recently moved in to this house and began to notice this issue after the local oil company came out to clean my oil furnace ( which is in my main bath. ) I also have the same problem upstairs in my 2nd bath where the hot water runs cold very quickly. I started to trouble shoot this down stairs first where i have a single handle Kohler faucet. I took the the handle off and adjusted the handle to turn more to the right to allow more hot water thru but that didn't fix it. I also read that concrete slab homes have this problem cause of the pipes running thru cold concrete. Could that be an issue even if the sinks have scolding hot water? Any information would be greatly appreciated.

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Old 12-07-2009, 09:14 AM   #2
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hot water problems.


What kind of water heater do you have?

Pipes buried in a slab foundation would not exhibit the problem you describe. The water might take a while to get hot but once you get hot water it should stay hot.

If the problem only happens at a single handle faucet, you could have a built in anti-scald bypass valve malfunctioning.

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Last edited by AllanJ; 12-07-2009 at 09:17 AM.
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Old 12-07-2009, 09:23 AM   #3
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hot water problems.


unsure of the water heater manufacture or model. Where might the anti scald be located near the shower head or behind the handle ? Also the faucet looks new when i took apart the faucet i seen a date of march 2008 printed on the piece i took out. When i get home I'll post pictures of what i took out and maybe that can help.

Thanks.
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Old 12-07-2009, 09:40 AM   #4
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hot water problems.


By "what kind of water heater", AllanJ was wondering is it an electric WH? Gas? Oil? Tankless?

If it's an electric water heater, the lower element may be burnt-out, and it would explain why it's a problem at a relatively high volume tub/shower valve, but not a problem at comparatively low volume lav or kitchen sink faucet with an aerator/flow restrictor.
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Old 12-07-2009, 09:54 AM   #5
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hot water problems.


its oil.
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Old 12-07-2009, 09:56 AM   #6
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hot water problems.


A tankless heater (heat exchanger; water back) on a forced hot water furnace can exhibit this kind of problem if it has accumulated sediment inside or if the water in the furnace is not adequately churned about the tankless for example with a "zone", immersion thermostat (aquastat) and circulator pump specificaly for the domestic hot water.

If a faucet set has an anti-scald valve this should be described in the instructions.
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Last edited by AllanJ; 12-07-2009 at 10:00 AM.
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Old 12-07-2009, 10:09 AM   #7
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hot water problems.


i'm not sure the exact model because it was here when i purchased the house a few months back. I searched some of the numbers on the parts i remved and came up with nothing. when i get home tonight i'll remove the cover to my heater and take a look and post back.

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Old 12-07-2009, 02:42 PM   #8
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hot water problems.


Quote:
Originally Posted by AllanJ View Post
A tankless heater (heat exchanger; water back) on a forced hot water furnace can exhibit this kind of problem if it has accumulated sediment inside or if the water in the furnace is not adequately churned about the tankless for example with a "zone", immersion thermostat (aquastat) and circulator pump specificaly for the domestic hot water.

If a faucet set has an anti-scald valve this should be described in the instructions.

Hi Allan, I am currently having the same sort of problem as Typo. I have a Columbia Boiler that heats my house via 3 stage baseboards and then it also heats my tap water. The hot water seems fine in my sinks but when it comes to the shower we start off hot where we use cold to offset and make comfortable but after a few minutes we have to begin backing off the cold water until we are just running hot and then that gets warm, cold. How would I go about checking or testing the possible problems you mentioned above?
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Old 12-07-2009, 09:15 PM   #9
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hot water problems.











Furnace


















Thanks.
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Old 12-07-2009, 09:26 PM   #10
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hot water problems.


Hi typo. I posted a very similar thread to yours in the HVAC room and this is one of the responses that I got:

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Originally Posted by beenthere View Post
Sounds like the tankless coil is insulated with mineral build up.

It can be replaced. Or cleaned out. But cleaning it out involves a acid that could eat through the copper of the tankless coil.

Now would be a good time to consider either getting an electric water heater. Or an indirect hooked up to your boiler.
I see a few similar parts on your boiler that are on mine so I am guessing that the answer above may possibly help you out. beenthere went on to say that cleaning the coils are time consuming and could damage the coils. Hope this is not the case but this could be the answer for both of our problems.
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Old 12-08-2009, 05:15 PM   #11
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hot water problems.


A tankless water heater has a rating for X gallons per minute raising the temperature of the water Y degrees. Now the output temperature will max out at the boiler temperature for heaters used with FHW furnaces. A flow exceeding the GPM rating will result in a reduced output temperature and if the flow is increased a lot, the output temperature will drop to levels you find unsatisfactory for a shower.

You can conduct tests by running water at various intensities. But for an amateur, many gallons of water will be flushed down the drain as you make measurements with thermometers, stopwatches, large buckets, etc.

As far as churning the boiler water goes when there is no zone for domestic hot water, you will likely get better GPM performance when all the heating zones are running compared with during the summer.

More practically, when a tankless that many years ago seemed to be trouble free will today no longer allow one person's taking of a shower with nobody else using hot water, it is expedient to replace the tankless unit. When you disconnect the domestic water inlet and outlet, you may see sediment inside.

It's up to you whether to try your luck with having a heating specialist flush out the tankless with acid.
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Last edited by AllanJ; 12-08-2009 at 05:18 PM.
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Old 12-10-2009, 07:43 PM   #12
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hot water problems.


well i'm at my wits end. i found a the piece i though i needed mixing cap and presure valve, but much to my dismay after replacing both pieces its the same 3 or 4 mins of hot water again no where near as hot as my other faucets and then luke warm. i'm not sure where else to look to resolve this issue?

Could there be a block in the hot line between the bathrom sink and shower? If so how can i test it or attempt to clear it?

Last edited by typo; 12-11-2009 at 11:22 AM.
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Old 12-13-2009, 11:14 AM   #13
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hot water problems.


it seems like it might be the hot water pressure to that faucet, how can i tell?
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Old 12-01-2011, 07:42 PM   #14
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hot water problems.


This seems to be a common issue, but any help would be appriciated since I don't know much about heaters. I have a 1974 Blueray Systems BRL-75 tankless oil burning heater/water heater. The water in the shower gets cold very quick (4-5 mins) and takes about the same or longer to heat back up. The temp drop only seems to manifest in the shower, althought the service guy said the temp drop was too fast and recovery time was too long, he also said parts for this unit were no longer available. Is there possibly a way to replace the water heater part itself, maybe with a stand alone tankless or do we have to replace the entire unit? At this time we do not have $3500 to do the whole unit. Also, if it helps, we have no issues with the heater part of it as of yet, although we just had the feeder replaced, the issue manifested before the feeder went bad. Any suggestions? Thankyou
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Old 12-02-2011, 07:17 AM   #15
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hot water problems.


Not sure if I posted my solution but it was the coil in my boiler. It was either pay 1000 for parts and labor to have it replaced or replace the whole unit. Since we just moved in and have no plans to have anytime soon we did the whole unit. My wife works for meenan so went thru them for the replacment. I notice you live in levittown pa so if ya have any questions feel free to pm me.

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