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Hi, Thanks for everyone ! The problem was gone After replacing the Union with tankless valve kit ( all are mady by brass) The problem was generated by the Union even it does not directly touch the copper pipe, but the water conducted the elelctrolyte-ion migration and the electricity (tankless...

Hi, Every One, Thanks for all the thoughts. Now I think it is not the dediment, since I have another water heater without the problem. And the cold water line is always clean. Please see the attached picture, Will this "Union" create the problem. It is not a brass/copper Union for both...

The rusty color water will only last about 10 seconds, then clean. it will come back if not used for a while. I have flushed (run the heater in 140 F degree) for an hour, but the rust-color water showed up again right after not using it for a day.

Please see the picture in the begining post. There are two water outlet, one is right before the heater(at the cold water line) and the another is right after the heater (at the hot water line). The water always clean before the heater. The water after the heater will become rust-color if it...

how to explain the test item 3: cold water in (clear) but rusty color(cold too, the heater shutted off) out of the heater, if it is water source problem ?

Hi, Here are more testing results, Please help to reasoning the root cause: 1. The deposit can be desovled back to water completely if the bucket is vibrated in couple of seconds. And it will deposit again into the bottom after a day. 2. Had the tankless water heater run in highest...

Thanks for your comments and suggestions. Here are more information and testings: 1. the water source is city water and it is drinkable. I have another tank water heater with no any problems. 2. The first picture is the total amout of the rusty water will come from the hot water...

I just intalled the GE tankless water heater. The hot water line will have about 10 seconds rust like water if it it not used for a day. So every day morning, there is about 10 seconds rust like water. The rust color will be more dark if not use hot water for a longer time. The plumber...

One case is: see the attached drawing, 1-1/2" vertical PVC 6 feet up to a grill box with a Mini Studor on the top, only one kitchen sink, what kind of connections will meets the code. Also please see the drawing, is that all the fig meets the code.

Hi, See the attached plumbing codes, 2006 IPC allow Wye & 1/8 Bend for Horizontal to Vertical connection and 2009 NSPC doesn't allow. Does any one know if 2009 IPC has changed this ? Thanks