(and why a well-designed cover is not harmful)
If you are considering a Viessmann heat pump cover, the good news is that the manufacturer’s manual explicitly allows the use of covers, provided that unit ventilation is carefully respected. In this guide, we explain why to install one, how to choose the right size, and how Box Air Klima covers optimize airflow, with examples for popular models like Viessmann Vitocal 150‑A, 250‑A, 200‑S, and 222‑S.
Why install a cover on your Viessmann heat pump
- Active protection: shields the outdoor unit from rain, hail, leaves, and dirt, creating more stable operating conditions — especially for Vitocal 150‑A/250‑A.
- Aesthetic integration: clean lines and finishes improve visual impact on facades and gardens, even for compact installations (e.g., Vitocal 200‑S/222‑S).
- Acoustic comfort: composite aluminum dampens vibrations more effectively than steel sheets, reducing resonance and echo; it also muffles the sound of rain better than traditional metal covers.
- Optimized ventilation: internal geometry guides airflow, prevents hot air pockets, and avoids recirculation toward the intake.
- Broad compatibility: solutions available for both ground-mounted and wall-mounted installations, including vertical versions for vertically developed units or raised bases as specified by the manufacturer.
Important note: Viessmann manuals allow the use of covers—as long as they are designed to promote and respect airflow inlet and outlet.
Is a cover for Viessmann heat pumps harmful?
No, not by definition. Issues arise from “closed” covers that trap air: hot air pockets near the exhaust, recirculation toward the intake, and increased noise. The solution lies in design: a cover must guide airflow—not obstruct it.
How Box Air Klima covers ventilate (vs. a “closed” cover)
✓ Adjustable louvers
Not just front-facing. Floor-mounted versions include louvers on the sides and rear, to direct airflow and break up the hot front zone. On wall-mounted units, louvers are front-only.
✓ Top-front air vent
Hot air rises. Placing the vent high at the front prevents stagnation and keeps the area in front of the heat exchanger cleaner—especially useful for vertical monobloc units like Vitocal 250‑A.
✓ Ground level feet + low inlet = chimney effect
With the cover lifted, cooler air enters from below and exits above. The resulting thermal gradient creates natural airflow—even in low wind—for garden installations like Vitocal 150‑A.
✓ Large side/rear intake openings facing the suction side
Openings positioned where pressure is lowest (near the radiators) encourage airflow and reduce turbulence and heat recirculation—useful for split systems like Vitocal 200‑S/222‑S.
In summary: the cover doesn’t “cover the air”—it guides it.
That’s the difference between a cover that chokes and one that supports the machine.
Materials and acoustic comfort
Box Air Klima covers use composite aluminum: a rigid, vibration-damping structure with less resonance than steel or aluminum sheets. Under rainfall, composite material is noticeably quieter than metal alternatives.
Vertical versions: when to use them
Vertical versions are designed for:
- Heat pumps with vertical layout,
- Units raised on manufacturer-specified stands to avoid water or snow.
These maintain open inlets below and vents above, ensuring effective protection and proper airflow—ideal for Vitocal 250‑A or raised installations.
FAQ
Does a cover for pompa di calore Viessmann increase energy consumption?
It depends. A “closed” cover can slightly increase consumption by causing hot air recirculation. However, our design (louvers, top vent, chimney effect, side intake) orders airflow. In real conditions (direct sunlight, wind, snow, ice), the protection and microclimate stability can maintain or even improve overall efficiency.
Is it compatible with my Viessmann model?
In most cases, yes—without custom sizing. Our range covers the majority of Viessmann heat pump models (e.g., Vitocal 150‑A, 250‑A, 200‑S, 222‑S). Custom solutions are evaluated only when necessary.
How to choose the right cover?
- Installation type: floor-mounted or wall-mounted? (Side/rear louvers are available for floor versions.)
- Real unit measurements: L × H × D including pipe curves, valves, condensate drains, supports/stands, and any nearby obstacles.
- Manufacturer-provided stands: if present, consider vertical versions.
- Installation environment: exposure to sun, wind, rain, leaves—choose appropriate louvers and configuration.
- Use the online configurator: match your model to the recommended cover (including Vitocal 150‑A/250‑A and the 200‑S/222‑S series).
- Size verification: consult the size guide to compare your measurements with internal dimensions, accounting for pipes and supports.
