Water leak from screw after flushing water heater
Flushing a tankless water heater for maintenance can cause a small water leak to develop around a housing screw or union. This usually happens because the screw acts as a penetration through the housing, forcing homeowners to try tightening the fittings themselves or risk calling a technician before the problem worsens.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Tightening the union fittings
- 2Calling a technician
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“I have a small leak coming from a screw.”source ↗
“this happened after I flushed the water heater last week.”source ↗
“If its on the union, tighten the union and pray. If its from the screw, its inside the cabinet and using the screw as a penetration through housing.”source ↗
“Thank you. I didn’t want to call a technician but I don’t want the problem to get bigger.”source ↗
Where this came up
People with this problem also raised
- 6Why is water backing up into the sink when appliances drain?
- 4Why does my new smart toilet have a weak flush?
- 3Why is there water on the floor around my new water heater?
- 2Dishwasher not getting water after plumbing work
- 7Why is a newly installed sink drain leaking above the trap?
- 4Water spitting out of pump vent pipe