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Author Topic: Water to Water Heat Exchanger  (Read 2147 times)

gmmaxim250

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Water to Water Heat Exchanger
« on: August 27, 2016, 07:22:36 PM »

Hello,
I think my water to water heat exchanger is shot.  A lot of mineral buildup on the outside and we seem to run out of hot water from time to time.  I am also thinking it might be time to put a new hot water heater in since I don't know how old this one is?  I am afraid that the tank has become filled with a bunch of sediment, therefore cutting down on the storage space inside of the tank...any thoughts?  I also wonder if the electric hot water heater is the best way to store hot water?  Any ideas?  Thanks...
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RSI

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Re: Water to Water Heat Exchanger
« Reply #1 on: August 27, 2016, 10:04:19 PM »

If may be able to clean out the heat exchanger. Is is a flat plate type? If so, what size is it? If it is a 10 plate you would be better off just replacing it. If 20 or more it is worth trying to clean.

Electric water heaters are a lot better than gas for storing hot water because they are fully insulated. The bottom and center tube on gas models lose heat.

Electric are a lot worse for sediment buildup though.
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gmmaxim250

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Re: Water to Water Heat Exchanger
« Reply #2 on: August 28, 2016, 02:05:23 PM »

No, it is a tube type, might have to replace it, though I am going to try flushing the tank first.  Just seems to not be retaining much hot water...could even be pump on furnace, but I will work from hot water tank out.
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RSI

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Re: Water to Water Heat Exchanger
« Reply #3 on: August 28, 2016, 07:03:07 PM »

It is a sidearm?
To find out if it is the boiler pump / loop flow problem, check the boiler water pipe after the heat exchanger. It will be a lot colder than before  if it is a flow problem. If you have an electric water heater and hard water you probably have a lot of sediment in the tank. Cleaning or replacing a sidearm may not last a long time if it is.

If the above is true, I would switch to a plate heat exchanger instead. You would have to probably clean it every year if the water is real hard.
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gmmaxim250

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Re: Water to Water Heat Exchanger
« Reply #4 on: September 01, 2016, 09:09:40 PM »

Yes, it is sidearm.  A couple of days ago, I flushed the hot water heater, and I pulled the the pressure release valve to try and make sure tube wasn't blocked.  Since then the temp and longevity of the hot water has been fantastic. 
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RSI

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Re: Water to Water Heat Exchanger
« Reply #5 on: September 02, 2016, 07:19:04 PM »

There was probably some air trapped at the top of the sidearm.
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