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Old 02-09-2009, 02:40 PM   #1
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hot water issues


Hi,
My boiler settings are:
HIgh: 180
Low: 150

Boiler runs fine, cycles all the dang time.

Sometimes water is piping hot, other times it's luke warm at best. I'm the only person in the house with a max of one faucet open at a time.

I was just about to say that every time I see the boiler it says 180 water temp.
Just now went down to look, was at 140.

Am filling up the tub, only hot faucet opened, and it's barely luke warm.

What is going on here? My boiler is a Burnham Jubilee. Newer Becket burner.

Do I need to turn my "low" setting up higher? Even with it at 140 before it was still usually piping hot. Sometimes I'd shower, it would be very hot the first few minutes, then cool right down to the point of almost being unbearably cold.

Thanks.

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Old 02-09-2009, 03:46 PM   #2
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hot water issues


Or, set the diff(should be a black dial above the low limit setting) to 10 if its at 20 or 25.

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Old 02-09-2009, 04:32 PM   #3
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hot water issues


diff was already set to 10.
something is very screwy here.
just filled up the tub. tried turning the t-stat up first, waiting a few minutes, then turning on the hot.
here's what happened:
after a few seconds water would come out steaming hot, then after about 10 seconds quickly turn to cool.
i'd turn it off, wait 30 seconds, and i'd get the same thing, exactly. piping hot water for 10-15 seconds, then immediately cool.
i was up there for 30 minutes, IN the tub, trying to get warm, and was futile.

the strange part? came downstairs and took a shower. was piping hot for a good 5-10 minutes, with only a tiny loss in heat towards the end.
(the tub is upstairs, the shower is downstairs.)

not sure what is going on. i had previously not noticed anything like this for the past two months or so.

thinking of dropping in an electric water heater, piped through the boiler, for the next few years. then ultimately go natural gas boiler with indirect water heater, or possibly wood/oil boiler combo.

this sucks, though. about to get a tenant up there and need to water issues to be fixed.

thanks for any help.
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Old 02-09-2009, 04:54 PM   #4
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hot water issues


Sounds like you may have a single lever faucet bleeding cold waer into the hot water line.
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Old 02-09-2009, 07:19 PM   #5
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hot water issues


The diff should always e at 20 - 25. That will supply you with more hot water. it could be a coil issue. See link below.
http://www.comfort-calc.net/Service/Domestic_Coils.html
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Old 02-09-2009, 07:39 PM   #6
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hot water issues


How old is your boiler?

If it's and older unit, there is a good chance the tankless coil is getting fouled up with mineral deposits and not allowing the heat to get transferred to the water. You can turn the temp up all you want and mess with the differential but you will probably need a new tankless coil eventually. I had this same problem. There is also a slight chance it could be the mixing valve. The tip off is that it starts out hot, then gets cold.
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Old 02-09-2009, 08:49 PM   #7
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Quote:
Originally Posted by tk03 View Post
The diff should always e at 20 - 25. That will supply you with more hot water. it could be a coil issue. See link below.
http://www.comfort-calc.net/Service/Domestic_Coils.html
The diff set at 20 to 25 allows the water to ge cooler, then when set at 10.

So it gives you less hot water. When the stat calls for heat.
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Old 02-09-2009, 10:58 PM   #8
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The problem is with one faucet in the tub upstairs? The problem is most likely the mixing valve in the upstairs tub. Some valves can be adjusted. Check the MFR's website for instructions.
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Old 02-10-2009, 07:33 AM   #9
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hot water issues


I had a similar problem and then it got bad.I used the downstair bath for a shower then the upstairs one too
I am a first time home buyer and the seller told me its all set. well last thursday night my house filled with smoke.had to shut the thing down and call emerygency .

well after 160$ for the emergency call and 125$ for a service on monday i am getting hot water and that too continously .I turned my mixing valve down after this. lesson learned from now i will service it every year.
also,while clogged i am sure the eff was rock bottom and its 81% now.its a 15 yr old burner so its not new either.

hope my experience sheds some light.
satz

Chard,

thanks i think i might have that issue on the upstairs shower , 1 more added to my long list of to do things lol.


Last edited by satz; 02-10-2009 at 07:37 AM.
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