(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.