In reference to the regular water heaters making a noise during the day and night I have found a temporary solution. I live in So Cal and a plumber friend of mine told me of a helpful hint to help with the constant crackling to keep them quieter. Attach a regular garden hose to the drain tap at the bottom of the heater, turn the tap on to drain the hot water along with the any calcium that may be in the unit for about 3 minutes. I have only drained about half of the heater at a time but it really helps when a water heater is older. I guess the calcium builds up in the heater tank over the years and by draining gets rid of some of the calcium. I do notice tons of white powder coming out as well so I'm assuming that's the calcium draining with the hot water. Good luck!
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