We are using a RC98 tankless heater with the commercial controller to allow us to heat to 185. Lately, and randomly, the unit only heats the water to about half of the set point. So we set it at 185 and water comes at about 120. The flow rate is obviously higher than when it normally goes at 185, but can't seem to find what is causing this. We do flush the heater with vinegar once a month to prevent mineral build up which is common at these higher temps.
Anyone have this problem before? Any advice would be great.
Anyone have this problem before? Any advice would be great.
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