Potential

**Health Risks from Non-Condensing Boilers**:

1. **Carbon Monoxide (CO) Poisoning**:
- **Incomplete Combustion**: Produces carbon monoxide.
- **Symptoms**: Causes headaches, dizziness, nausea, and can be fatal.

2. **Poor Indoor Air Quality**:
- **Combustion Byproducts**: Releases harmful gases like nitrogen dioxide (NO2), irritating the respiratory system.

3. **Inefficient Heating**:
- **Cold Indoor Environment**: Leads to insufficient heating, causing hypothermia, respiratory issues, and cardiovascular stress.

4. **Moisture and Mold**:
- **Condensation Issues**: Leaks or improper venting can cause moisture buildup and mold growth.

**Mitigation**:
- **Regular Maintenance**: Service annually.
- **CO Detectors**: Install detectors near the boiler and sleeping areas.
- **Proper Ventilation**: Ensure proper venting.
- **Upgrade**: Consider upgrading to a modern condensing boiler for better efficiency and fewer emissions.