Jul. 01, 2025
As heat pump water heaters become increasingly popular for their energy efficiency and environmental benefits, selecting the right discharge configuration is just as critical as choosing the right model. At Forlssman, we offer both top-discharge and side-discharge all-in-one heat pump water heaters, each tailored to suit different installation environments.
When selecting an all-in-one heat pump water heater, one of the most critical installation considerations is the air discharge direction. Both top discharge and side discharge models offer distinct advantages depending on your space layout, ventilation, and user preferences. Here’s a detailed comparison to help you make the right choice.
| Feature | Top Discharge | Side Discharge |
| Airflow Direction | Air exits vertically from the top | Air blows horizontally from the side |
| Best Installation Areas | Open patios, rooftops, well-ventilated outdoor zones | Balconies, utility rooms, basement corners |
| Space Layout | Requires clear space above for ventilation | Can be installed closer to walls or corners |
| Heat Pump Efficiency | Promotes natural upward airflow | Efficient if side airflow is unobstructed |
| Noise Perception | Noise dissipates upward; less intrusive | Horizontal noise may feel more noticeable indoors |
| Maintenance Access | Needs top clearance for service access | Side access is sufficient; top can be closer to wall |
| Common Use Scenarios | Outdoor installations with overhead clearance | Indoor or semi-enclosed spaces with wall proximity |
For outdoor, open spaces like rooftops or patios → Top discharge is ideal.
For indoor, confined, or wall-adjacent areas → Choose side discharge to save space.
Good upward ventilation → Top discharge performs best.
Side openings or wall vents → Side discharge is more suitable.
Noise-dampening priority → Top discharge disperses sound upward.
Enclosed or low-traffic areas → Side discharge is acceptable.
Exposed installation → Top discharge offers a sleek, vertical design.
Concealed or semi-built-in installation → Side discharge aligns better with cabinetry or recesses.
Cold-climate region→ The European Series with EVI is engineered for subzero performance.
Moderate-climate market → The Australian Series is cost-effective and efficient.
| Scenario | Recommended Type |
| Rooftops, courtyards, open decks | Top Discharge |
| Apartment balconies, tight corners | Side Discharge |
| Equipment rooms or basements | Side Discharge |
| Commercial boiler room systems | Depends on layout |
Choosing between top discharge and side discharge heat pump water heaters depends on your space constraints, ventilation access, and user comfort expectations. Both configurations offer the same core efficiency and environmental benefits, but adapting the airflow direction to your installation environment will ensure optimal performance and long-term reliability.
Whether you're installing in a private residence, hotel, or multi-unit housing project, Forlssman offers flexible all-in-one solutions tailored to your regional climate and building layout.
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