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duha79
No hot water
duha79

I have an oil burning furnace that heats the house and hot water. I have 60 gallon hot water tank located right next to the furnace. Both furnace and tank are located in the middle of the basement away from any walls. Lately I am only getting barely warm water in the morning and as the day progresses water goes completely cold and the cycle continues every morning. There is a thermostat attached to the water tank that was set to 120. I moved the dial to 140 but no change. There are three zone valves. One for 1st floor heat, one for 2nd floor heat and one for the hot water. The insulated pipe that comes from the zone valve to the water tank is hot near the valve but barely warm near the tank.

My guess is either the zone valve or the thermostat in the hot water tank is not working.

Any help on how to properly diagnose/fix this issue is appreciated.

*Update: right now all cold water, all the time.

dodsworth
Re: No hot water
dodsworth

What is the name & model # of the zone valve??

Most zone valves have a little lever that can be turned down to physically open the zone valve HW line--try doing this---check the wiring on the ZV to make sure all wires are tight & go to the right terminal---the boiler should fire up within a minute or two when you open a faucet & use any hot water---post some photos if you can.

duha79
Re: No hot water
duha79

Hi, Sorry for delayed response...I was at work. I moved the lever up on the zone valve but nothing happened. Water is ice cold. Checked the wiring, and they are all tight. It's a Taco valve. Not sure what the model number is. I took some pictures but kept getting error when trying to upload. I will try again later.

duha79
Re: No hot water
duha79

Does anyone know how to upload images? I have .jpg image files that I compressed to very small size but I keep getting error message stating it's not a valid image file.

Pelton
Re: No hot water
Pelton

"My guess is that the zone valve or the t-stat in the hw tank is not working"

Yes, I think you have nailed it down to the 2 components that have to be examined.

Drain some water out of the HW tank & see if it comes out hot---if it doesn't the problem is in the HW tank t-stat----if it does the problem is in the zone valve.

Only the "head" of the zone valve has to be replaced if the problem turns out to be in the z-valve---but definitely isolate the problem before you spend money on any new components.

duha79
Re: No hot water
duha79
Pelton wrote:

Drain some water out of the HW tank & see if it comes out hot---if it doesn't the problem is in the HW tank t-stat----if it does the problem is in the zone valve.

There are two draining valves...one attached to the tank and one is attached to the pipe that comes from the zone valve into the tank. Which valve should I use?

OK, I drained water from both and got ice cold water from both.

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