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 Phil Your Own Question
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

I have a Paloma tankless water heater==the temp is set at

Customer Question

I have a Paloma tankless water heater==the temp is set at 120 degrees==when taking a shower the temp will suddenly go cold will heat back up when adjusted what can I do to prevent this --thanks
Submitted: 12 months ago.
Category: HVAC
Expert:  Rick replied 12 months 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.

​The 2 most common causes of this occurrence are either a dirty filter on the cold water inlet to the heater or water temp that's set to high. If you hadn't told me this was set to 120 I'd suspect the latter immediately. So I wonder if the temp sensor on the unit is working properly. Is the full on hot water actually 120? The filter is a cap on the side of the fitting where the cold water line into the heater is connected. To clean it you need to turn of the water to the unit then open a hot water (only) faucet and let it run util it stops. The unscrew the filter cap while you have a bucket handy to catch any water that might run out when you take the filter off. Of course you need to unplug the unit or turn off the gas before you do this.