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I have a boiler with a tankless coil for my domestic hot water. Lately the hot water has been "fading out" and running out to fast. I have read some info on the net that has stated the coil may need to be acid cleaned. Is this something I can do myself? If it is not worth the trouble cleaning can I replace it? I know my way around a wrench and I am not afraid to get my hands dirty. Please advise...If there are any net links I should investigate please let me know.