Flushed out tankless water heater for about an hour lots of dirt and debris came out of it flushed it with freshwater for about 15 minutes afterwards ran all the hot water lines to flush the lines. Water heater is working great. Remove the aerators on the bathroom, sinks downstairs and the two master bathroom sinks however, the upstairs jack and Jill bathroom that connects the bedrooms those aerators are very stuck on so bad where it broke the tool Explain this to Steve we can try again next visit Janet. The tenant is very happy with the water pressure and all of the faucet she is regularly. Highly recommend a water filter to avoid all of this in the future. The house is meant for a filter where it would be inside the garage right next to the tankless water heater.