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I have 2 tankless water heaters (in different locations), a Navien and a Rinnai. Both manufacturers recommend they be cleaned annually to remove mineral deposits. In both locations, I also have water softeners, and I have been told that with water softeners, I don't need to do the cleaning since...

I just had tankless water heater installed, and am not getting very hot water; is is 109 degrees but heater is set for 135 degrees, Installer clams it is because of crossover at one or more fixtures. How do I check for crossover?

I just had a tankless water heater installed. They ran the PVC exhaust line through the existing (standard heater) flue that goes through the roof. They closed off the top of the flue with aluminum tape. I'm concerned that the tape will deteriorate in the not too far future. Am I correct? And if...

I frequently am away from home for a week or so. and when I return, my tap water has a yellow color in it. It clears up after running it for several minutes. What causes this to happen? BTW: I have a Nevien NPE-240A tankless water heater that is 2 years old. Thanks for your help!

I have an Astor cb 1000 (seat mounted) bidet. Every time I use it, the pipes bang & rattle big time. How do I fix that?