Tankless Gas Water Heater Has No Hot Water?

(The below solution applies to non-constant-temperature  tankless gas water heaters.)

If your tankless gas water heater isn’t producing hot water, improper **gas/water regulator settings** are likely the cause. Follow these steps:  

1. **Adjust the Gas Regulator**  

  - Turn the **gas control knob** clockwise from *Minimum → Maximum* to increase gas flow.  

2. **Optimize Water Flow**  

  - Rotate the **water control knob** clockwise from *Maximum → Minimum* to reduce water flow, allowing better heating.  

3. **Boost Burner Output**  (if applicable)

  - Switch burner from *Low → High* mode for higher thermal efficiency.  

**Check These Too:**

✅ Ensure gas supply is active (test other gas appliances).  

✅ Verify water pressure (clean inlet filter if blocked).  

✅ Purge air from gas lines by cycling the tankless gas water heater 3-5 times.  

If the issue persists, contact your nearest support team for diagnostics.