How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Marc Your Own Question
Marc, Plumber
Category: Plumbing
Satisfied Customers: 1126
Experience:  Plumbing heating & home maintenance contractor
Type Your Plumbing Question Here...
Marc is online now
A new question is answered every 9 seconds

Do you have experience with rinnai tankless water heaters

Customer Question

Do you have experience with rinnai tankless water heaters
Submitted: 1 year ago.
Category: Plumbing
Expert:  Rick replied 1 year ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

How did you flushed the unit? did you pump vinegar through it?

Customer: replied 1 year ago.
I flushed with pump and vinegar for 30 minutes .
Expert:  Rick replied 1 year ago.

I can't think of anything off hand that fits all your symptoms. I'll get back to you if I do. In the mean time I'm going to open this backup to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.

Expert:  Phil replied 1 year ago.


This is either a bad valve seat in the water heater flow controls, or more likely a bad valve seat at the faucet you are drawing hot water from.

In order to determine which do your pulse testing at various different faucets in the house... if they all pulse the problem is with a valve seat in the hot water shut off valve near the water heater, or inside the water heater.

You can operate any of the shut off valves outside of the water heater in the hot water line slightly while you feel the pulsing, if it stops with a slight adjustment, that is the bad valve seat most likely.

Tell me what you find, we can go from there without a time limit.