Beebee9911
New Member
Hi Everyone,
I need help diagnosing rusty water coming out of my new Rinnai Tankless Water Heater. Here's the info and "symptoms".
- I have 2 units RL94IN (indoor) and RL94EN (outdoor), installed about 1 month ago.
- When I filled my bath tub today, suddenly light brown water came out. It continued on for a few minutes, then became clear again. However when I drained the "seemingly clear" water, it left brown residue on the tub bottom (see pic). It is a very fine brown powder and it was kinda "dissolved" when I mixed the water.
- The brown residue appeared in both hot and cold water. However there is more brown residue in hot water than cold.
- I checked my second bathroom, which is connected to the other Rinnai. SAME issue.
- We use water frequently during the day. No long period of no water usage.
- We use the brass hot and cold valve kit that came together with the unit. Brass shouldnt rust (see pic of valves and all fittings/connections).
- My neighbor has no issue, meaning it is not due to the water source.
- It is unlikely that the parts inside the water heater can rust. Rinnai would be bombarded with complaints if that is the case lol.
- I just replaced my water supply with copper pipes. (I am in a middle of home remodeling)
I found this thread from another person back in 2012 who had the same issue. However he only had rusty water from the hot water. He found out that Dielectric Fittings was the cause and once he replaced it with the brass valve kit from the manufacturer, the problem went away. I am already using the brass valve kit from Rinnai.
https://terrylove.com/forums/index....er-come-from-new-tankless-water-heater.48158/
What could be the cause then?
Thank you so much for your help. I really appreciate it.
I need help diagnosing rusty water coming out of my new Rinnai Tankless Water Heater. Here's the info and "symptoms".
- I have 2 units RL94IN (indoor) and RL94EN (outdoor), installed about 1 month ago.
- When I filled my bath tub today, suddenly light brown water came out. It continued on for a few minutes, then became clear again. However when I drained the "seemingly clear" water, it left brown residue on the tub bottom (see pic). It is a very fine brown powder and it was kinda "dissolved" when I mixed the water.
- The brown residue appeared in both hot and cold water. However there is more brown residue in hot water than cold.
- I checked my second bathroom, which is connected to the other Rinnai. SAME issue.
- We use water frequently during the day. No long period of no water usage.
- We use the brass hot and cold valve kit that came together with the unit. Brass shouldnt rust (see pic of valves and all fittings/connections).
- My neighbor has no issue, meaning it is not due to the water source.
- It is unlikely that the parts inside the water heater can rust. Rinnai would be bombarded with complaints if that is the case lol.
- I just replaced my water supply with copper pipes. (I am in a middle of home remodeling)
I found this thread from another person back in 2012 who had the same issue. However he only had rusty water from the hot water. He found out that Dielectric Fittings was the cause and once he replaced it with the brass valve kit from the manufacturer, the problem went away. I am already using the brass valve kit from Rinnai.
https://terrylove.com/forums/index....er-come-from-new-tankless-water-heater.48158/
What could be the cause then?
Thank you so much for your help. I really appreciate it.
Attachments
Last edited: