Buffer Boiler
Buffer Tanks: The High-Efficiency Energy Hub of Heat Pump Systems
Boilers are the most critical component determining the efficiency of heat pump systems. The FENNEX BufferBoiler series has been specifically developed to extract maximum energy from low-temperature heat sources and store this energy with minimal loss. It optimizes both heating support and domestic hot water needs in a single unit.
The FENNEX Difference in Heat Pump Systems
Heat pumps are sensitive systems; FENNEX supports this sensitivity with advanced engineering solutions:
- Expanded Heat Transfer Surface Area: Since heat pumps operate at low temperatures—such as 50–55°C—the coil surface areas in FENNEX Buffer Boilers have been specifically increased. This ensures fast and uninterrupted hot water supply even with low-temperature energy.
- Bottom-to-Top Heating: FENNEX’s signature coil design, which extends all the way to the bottom of the tank, heats the entire volume of water inside. It resolves the “insufficient temperature” issue commonly seen in heat pump systems by heating every point of the tank uniformly.
- Replaceable Coil Technology: Long-term operating costs are critical in heat pump systems. Our coil design, which can be removed and reinstalled as a single unit, shortens maintenance times and extends the boiler’s lifespan to match that of the building itself.
- Defrost Support and System Balance: The buffer structure provides the energy the system needs when the heat pump switches to “defrost” mode, preventing a disruption in indoor comfort and extending the unit’s lifespan by preventing frequent on-off cycling (short-cycling).
Technical Advantages
| Feature | Contribution to Heat Pump Efficiency |
| Large-Surface-Area Coil | High kW transfer even at low flow temperatures |
| Flexible Coating (FEN-X PLUS) | Flexible, crack-resistant interior surface protection against temperature changes |
| Buffer (Balancing) Feature | Stable operation that extends the compressor's lifespan in a heat pump |
| Maximum Insulation | Retaining the energy that the heat pump has worked so hard to generate for hours on end |
Why Use a Buffer Water Heater with a Heat Pump?
By their very nature, heat pumps generate energy slowly. FENNEX Buffer Boilers intelligently “buffer” this energy, ensuring the system can respond to sudden hot water demands without straining. They optimize the system’s coefficient of performance (COP), particularly in combinations of underfloor heating and heat pumps.
FENNEX
“Combine the power of your heat pump with FENNEX’s engineering expertise.”