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Old 10-09-2011, 07:11 AM   #1
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Only hot water when taps fully opened


When I turn the hot water on it*takes a little while before the*furnace turns on (you hear a cllick) to start heating the water thus it takes awhile for the water to warm up.*Once it reaches a very hot temperature, of course you must turn th tap towards the colder side (somewhere in the middle) to get warm water. However when this happens the*furnace turns off rapidly (you hear a click)*and then*you have some (not much)*remaining warm water that comes out until it goes quickly cold again and then you have to start the whole cycle from the beginning again.*Basically the part of the furnace that's supposed to "sense" that the water is getting cold in order to*turn on and make some more seems to not*be responding to the situation. Of course you can't keep the tap right at the max hot side b/c it's too hot to work with. So we either have very*hot water or cold water and in between some of the little bit of warm water. Any suggestions on what might be the problem here? The mechanic said it might be the pipes?

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Old 10-09-2011, 07:29 AM   #2
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Only hot water when taps fully opened


What brand and model? Most of those require a good level of electrical knowledge to fix---

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Old 10-09-2011, 07:45 AM   #3
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Only hot water when taps fully opened


Do you have a hot water heater or boiler to make hot water any circulators? Clicking sounds like control board that either connected to circulator or boiler.
Provide pic of system if you can.

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Old 10-09-2011, 08:58 AM   #4
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Only hot water when taps fully opened


Sounds like this is a tankless heater, just by the explanation, this is the exact reason I would never have one.

Tankless heaters sense flow not temperature, when you cut back on the flow the unit shuts off.

The only way that I can see to remedy this is to have a holding tank controlled thermostatically.

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Old 10-09-2011, 09:36 AM   #5
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Only hot water when taps fully opened


Quote:
Originally Posted by Jackofall1
Sounds like this is a tankless heater, just by the explanation, this is the exact reason I would never have one.

Tankless heaters sense flow not temperature, when you cut back on the flow the unit shuts off.

The only way that I can see to remedy this is to have a holding tank controlled thermostatically.

Mark
Thanks for pointing that out Mark make sence.

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Old 10-12-2011, 06:47 PM   #6
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Only hot water when taps fully opened


The make is Agpo Ferroli. This one does not contain a tank. And it only gives hot water when volume is high enough (tap completely opened).

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