Dometic (formerly part of the Electrolux group) is the leading brand in campervan roof lights and skylights. The Heki range has been installed in millions of motorhomes across Europe and is the benchmark for quality.
This review covers the Heki 1, Heki 2, and Heki 3 models, with installation insights and UK-specific considerations.
The Heki Range
| Model | Opening | Internal Size | Price | Key Feature |
|---|---|---|---|---|
| Heki 1 | Manual tilt | 400x400mm | £300-400 | Entry-level |
| Heki 2 | Manual tilt + flyscreen | 500x500mm | £450-600 | Mid-range |
| Heki 3 | Manual tilt + flyscreen + blackout blind | 700x500mm | £600-800 | Largest |
| Heki Midi | Manual tilt + blinds | 400x400mm | £250-350 | Compact |
| Heki Rooflight | Fixed (no opening) | 400x400mm | £200-300 | Light only |
Build Quality
Construction: The Heki range uses a double-skinned acrylic dome with an aluminium frame. The outer dome is UV-stabilised and the inner diffuser spreads light evenly.
Seals: EPDM rubber seals with a compression closure. The hinge mechanism is brass (corrosion-resistant). The gas strut (Heki 2 and 3) is replaceable.
Durability: 8/10. The acrylic dome is impact-resistant but can craze after 10+ years of UV exposure. Replacement domes are available (£80-150 depending on model).
Installation
Opening size: Each model requires a specific roof cutout. Heki 2 needs 500x500mm, Heki 3 needs 700x500mm.
Installation method:
- Cut the roof hole (template provided)
- Prime the bare metal edge
- Apply Sikaflex 512 around the frame
- Lower the skylight onto the roof
- Secure with internal screws (screws through the inner frame into the outer frame)
- Fit the internal trim and blind mechanism
Difficulty: Medium. The large hole is nerve-wracking but the installation is straightforward. The Heki comes with a comprehensive manual.
Time: 2-3 hours including sealant curing time (24 hours before you should open it).
Insulation and Condensation
The Heki range has reasonably good insulation for a skylight:
| Model | R-value | Condensation Risk |
|---|---|---|
| Heki 1 | R-1.2 | Moderate (single dome) |
| Heki 2 | R-1.5 | Low (double dome) |
| Heki 3 | R-1.5 | Low (double dome) |
In winter conditions, the Heki 1 can develop condensation on the inner dome. Heki 2 and 3 are better because the double dome creates an insulating air gap.
Winter hack: Fit a removable insulation panel (Reflectix cut to size) inside the blind track. This adds R-2 and eliminates condensation.
Light Quality
The Heki's massive acrylic dome lets in significantly more light than a roof fan or standard window. In a van conversion, a Heki transforms the interior from a dark box to a bright, airy space.
The inner diffuser spreads light evenly — no harsh shadows or bright spots. The blind (Heki 2/3) blocks 95% of light when closed.
Our measurement: A Heki 3 lets in the equivalent light of a 40W LED bulb on a sunny day. It is genuinely transformative for the feel of a van.
Ventilation
All opening Hekis tilt outward at the rear, creating a positive pressure vent that draws air out while keeping rain out. The opening angle is about 30 degrees.
Airflow: Adequate for general ventilation but does not move as much air as a roof fan. Think of it as a permanent vent rather than a high-flow fan.
In practice: Heki open + a side window creates good cross-flow on a breezy day. For still days or moisture removal, you still need a roof fan.
Price Comparison vs Alternatives
| Product | Size | Opening | Price |
|---|---|---|---|
| Heki 2 | 500x500mm | Yes | £450-600 |
| Roof fan + light (Maxxair) | 350x350mm | Yes (fan) | £280-350 |
| MPK Skylight | 400x400mm | Yes | £150-200 |
| Remi Roof Light | 400x400mm | Fixed | £80-120 |
| Fiamma Roof Light | 400x400mm | Yes | £180-250 |
Verdict: Heki is 2-3x the price of budget alternatives. The extra cost buys better seals better light diffusion, and proven long-term durability.
Which Heki Model?
Heki 1: Good for a simple skylight on a budget. Use if you already have a roof fan for ventilation and just want extra light.
Heki 2: The best value. The 500x500mm opening is large enough for light and escape access. The flyscreen and blind are practical.
Heki 3: Maximum light. The 700x500mm opening is huge. Best for a living area where you spend most of your time.
Verdict
Rating: 9/10
The Dometic Heki skylight is the premium choice for a reason. It is well-built, lets in exceptional light, and has proven durability across decades of motorhome use. The price is high but the quality justifies it.
Our recommendation: Install a Heki 2 above the main living area. It provides enough light to transform the interior, the blind gives privacy, and the flyscreen is useful in summer. For the bedroom area, a smaller fixed rooflight or roof fan is sufficient.
