Hayward 206A heater was leaking. Is this exchanger toast??

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Welcome to TFP.

How did you look for leaks in it?

I would think it should be replaced.

Let's see what @swamprat69 says.
 
Before you removed the heat exchanger, where was the leak presenting at? I had a leak in my Hayward H400 that was showing at the endplate of the heat exchanger by the water header. Cleaning the O-ring gasketing surfaces and replacing the water header O-ring solved the problem. It might have been easier to pinpoint the place where it was leaking before actually removing the heat exchanger. When you talk about corrosion, are you talking about the blue/green coating/coloration of the heat exchanger fins/tubing? That is the end stage of oxidation of metals containing copper and is actually preventative of further oxidation. As long as there is a normal clear space between the oxidized fins, you will only lose a small amount of heat transfer due to the oxidized surface.
 
swamprat69 said:
Before you removed the heat exchanger, where was the leak presenting at? I had a leak in my Hayward H400 that was showing at the endplate of the heat exchanger by the water header. Cleaning the O-ring gasketing surfaces and replacing the water header O-ring solved the problem. It might have been easier to pinpoint the place where it was leaking before actually removing the heat exchanger. When you talk about corrosion, are you talking about the blue/green coating/coloration of the heat exchanger fins/tubing? That is the end stage of oxidation of metals containing copper and is actually preventative of further oxidation. As long as there is a normal clear space between the oxidized fins, you will only lose a small amount of heat transfer due to the oxidized surface.
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Last year at pool closing I noticed a leak coming from left side but i didnt see it coming from the header. There was alot of corrosion on the left side(not by the area where the water flows. Here is the image before heat exchanger was removed. My husband did not do anything at that time. I have since pushed him since the season is coming up an i dont want to be without a heater lol. I just want to make sure the corrosion isnt an issue? Can it be cleaned off? Is there a way to check it without it hooked up? Could it have been loose nuts from the headers?? O-ring issue? 20220320_145906.jpg
 
I would reassemble the heat exchanger, with new O rings, to the header and get water flowing through it and see if it still leaks. If it leaks try and pinpoint where the leak is.
 
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