Sediment in lines -Bosch Tankless Water heater
I would recommend a simple sediment filter housing be installed on the main water line coming into the house. Material cost about $100. Have a plumber install a bypass loop so you can just shut off 2 valves when you need to change it. I always install one with any tankless heater as cheap insurance against such a problem. As far as adding something to clean the lines I would refer to the manufacturer's instructions and use only what they recommend in order to preserve your warranty. For a solar water heater I prefer Velux.
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