Sediment in hot water lines with tankless heater
I have been having problems with sediment (looks like large pieces of sand and tiny rocks in varying colors of brown and black) accumulating in my faucet aerators and shower heads. I installed a whole house filter at the water main thinking that the water coming into the house was simply "dirty". Then I cleaned all the aerators in the house, and even decided to clean out the lines for my washing machine. That's when I realized the problem is with my hot water only, because the cold line to the washer was super clean but the hot water line was full of the sediment. It is so bad at this point that I am cleaning out aerators on a weekly basis, otherwise there is no pressure or hot water at the faucet or shower head. The washing machine keeps giving me an error code becaue the hot line is full again and no hot water is getting to it. I have an electric tankless water heater and I thought that there wasn't supposed to be any sediment with a tankless heater. My home is less than five years old and I live in Tucson, Arizona. The water has been tested and the hardness is less than 10. Anyone have any idea what is causing this problem?
sediment from tankless hot water heater
All tankless manufactures recommend softeners if the water has more than 11 grains of hardness (roughly 210 ppm total dissolved solids). Calcium will precipitated out in hot water which is why you are experiencing the debris you are in appliance pre filters and aerators...
Have Rinnai Tankless and sediment also
My plumber said it was from the old tank heater and the crud it created.
He comes out, on schedule, to flush the system, run a vinegar solution through it and then flush it again. He also replaces my whole house filter and maintains the faucets for me as well.
I go around about every 2 weeks or so and clean out all of my faucets and other filtery kind of things to prevent blockages.
The routine maintenance is required for the warranty on the Rinnai or you may not get service on it. It does not reduce the crud, but does guarantee that the heater itself is not going to be damaged by it.