Difference Between Condensing and Non-Condensing Boilers
The main difference between condensing and non-condensing boilers is their operational method:
Non-Condensing Boiler
In a Non-Condensing Boiler, after fuel combustion, the combustion gases pass through tubes that heat the water around them. The water temperature rises through heat transfer from the tubes. Then, combustion products exit the flue at temperatures above 150°C, wasting the latent heat contained in the water vapor of the combustion products.
Condensing Boiler
In a Condensing Boiler, the heat from combustion gases is recovered. The water vapor in the exhaust gases condenses into liquid, releasing latent heat. This heat is then used to preheat the system’s incoming fluid, significantly improving energy efficiency. Condensation technology recovers wasted energy by lowering exhaust gas temperature below the dew point.
10 Key Differences Between Condensing and Non-Condensing Boilers
- Noise & Vibration: Condensing boilers are quieter due to their burner design.
- Flue: Condensing boilers use stainless steel flues and do not require a high roof flue.
- Efficiency: Condensing boilers recover latent heat, achieving up to 98% efficiency.
- Dimensions: Smaller footprint, suitable for compact boiler rooms.
- Scale Formation: Condensing boilers are more sensitive to scale; maintenance is required.
- Performance: High controllability and efficiency reduce building operational costs.
- Cost: Higher initial cost, but better efficiency and lower maintenance expenses.
- Installation & Maintenance: Easier to install and maintain than non-condensing boilers.
- Capacity: Condensing boilers are limited in maximum capacity; large capacities require non-condensing boilers.
- Application: Condensing boilers are ideal for hotels, residential, commercial, and educational buildings; factories and high-capacity applications use non-condensing boilers.
Summary Table
| Feature | Condensing Boiler | Non-Condensing Boiler |
|---|---|---|
| Noise & Vibration | Low | High |
| Flue | Stainless Steel | Steel |
| Efficiency | High (up to 98%) | Lower |
| Dimensions | Compact | Larger |
| Scale Formation | Sensitive | Less Sensitive |
| Performance | High | Moderate |
| Cost | Higher | Lower |
| Maintenance Cost | Lower | Higher |
| Installation & Maintenance | Easier | Complex |
| Capacity | Limited | Higher |
| Application | Hotels, residential, commercial, educational buildings | Factories and high-capacity applications |
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