M
this is not always the case i personally have seen coils to be leaking and with no colour difference in the water.
i'd imagine your expert is not wrong with his decision simply because he is being paid well for his expertise.
1 You may notice a yellow tinge in the hot water caused by mixing with dirty heating water.
2 More importantly. water will always try to find it's own level, if the water mixed in the coil and the two systems became one. Whichever tank in attic is lower, it will constantly fill trying to get to the same level as other tank. This results in one tank constantly overflowing and water running from the eves of your house. you would notice this.
This is simple physics, Did you notice any of these symtoms.
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