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Right now I'm descaling the heat exchanger in our tankless water heater.
Basically it involves isolating the city water supply going into the water heater and the house hot water line (both through valves below the heater), and then running two gallons of distilled white vinegar through the water heater with a pump for 45 minutes to get rid of lime scale in the heat exchanger.
After that, flush the water heater with water for 10 minutes to get rid of any vinegar, and then set the valves to normal operation. Pretty easy, and should be done yearly.
Basically it involves isolating the city water supply going into the water heater and the house hot water line (both through valves below the heater), and then running two gallons of distilled white vinegar through the water heater with a pump for 45 minutes to get rid of lime scale in the heat exchanger.
After that, flush the water heater with water for 10 minutes to get rid of any vinegar, and then set the valves to normal operation. Pretty easy, and should be done yearly.