When I turn the handle of my under the sink insinkerator hot water heater, it takes a few seconds for the water to come out. it used to be instantaneous.
It may have mineral deposit buildup on the inside. You will need to consult your maintenance manual to see how to flush the unit and clear it of deposits. You can also contact Insinkerator for the information as well. You can use vinegar to clean it just like you would a coffee pot. Take the inlet supply off and using a funnel pour the vinegar in and turn the unit on.
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insinkerator tap dispenses hot water but will not stop when leaver is released
insinkerator tap keeps running hot water after I release the lever
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