I have flushed instant water heaters like Rinai's with Vinegar. Has any one done this on a say 40 gal water heater with good results? I'm going to try it next week. I have a two year old water heater with alkai up to the gas control sensor already. (yes I'm researching soft water solutions for this customer) I'm going to install bypass valves and fill a 5 gal bucket with vinegar and ciculate it through th system.
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Flushing water heaters with Vinegar