The hot wedge welding machine is offered in two power options: 800 W and 1800 W. The difference is not only electrical power: each model is sized to weld materials within a distinct thickness range. The 800 W works with thin films and geomembranes (0.2 to 1.0 mm) and produces a 12.5 mm wide seam. The 1800 W works with thick materials (0.8 to 4.0 mm) and produces an 18 mm wide seam. Both share heating temperature (0-450 °C), welding speed (0.5-5 m/min), and seam strength (≥85% of the base material). The choice comes down to the thickness of the material you will weld and the scale of your project.
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What to consider before choosing the variant
The two machines share heating temperature, welding speed, overlap width, and seam strength. They differ in power, allowable material thickness, internal cavity width, produced seam width, dimensions, and weight. These are the criteria for making the right choice:
- Material thickness to be welded: the decisive factor. The 800 W covers 0.2-1.0 mm: thin greenhouse films, tarpaulins, light geomembranes (0.5 mm), small pool liners. The 1800 W covers 0.8-4.0 mm: industrial thickness HDPE geomembrane (0.75-2.0 mm), landfill waterproofing sheets, large capacity tanks. There is an overlap in 0.8-1.0 mm: in that range, either one works.
- Scale of the project: small or medium projects with thin material → 800 W (lighter, portable, easy to handle). Industrial or large-scale projects with thick material → 1800 W (more robust, wider and stronger seam, greater durability under intensive use).
- Width of the produced seam: 12.5 mm × 2 (800 W) vs 18 mm × 2 (1800 W). A wider seam provides more adhesion surface and greater mechanical resistance against tension and vibration. For geomembranes in critical waterproofing applications (landfills, industrial ponds), the wider seam of the 1800 W is preferable.
- Internal cavity: 12 mm (800 W) vs 16 mm (1800 W). This determines the maximum sheet thickness that can pass between the rollers. If working with geomembrane of 1.5 mm or more, you need the 1800 W.
- Voltage and frequency: both operate at 220-230 V (standard Dominican and industrial electrical grid). The 1800 W specifies 50/60 Hz. Check your site's electrical grid and, if working with a generator on-site, size it appropriately: the 1800 W requires a generator of at least 2.5 kW for stable operation.
- Class II insulation: the 800 W is Class II (double insulation, no ground connection required). For use on wet sites or on conductive surfaces, this detail is relevant for operator safety.
800 W variant: the portable one for thin materials
- Light and portable (5 kg)
- Compact: 40 × 25 × 28 cm
- Class II insulation
- Standard 220-230 V voltage
- Thickness 0.2-1.0 mm
- Narrower seam: 12.5 mm × 2
- Not for welding geomembrane ≥1.0 mm
- 12 mm internal cavity
The 800 W machine is the choice for contractors and professionals working with thin films and light geomembranes. Its 5 kg weight and small dimensions (40 × 25 × 28 cm) allow it to be transported to the site by hand or in a small vehicle, and its Class II insulation provides safety when working outdoors or in damp areas. It is the standard option for waterproofing small residential or commercial roofs, welding tarpaulins, installing greenhouse films, liners for small pools or ponds, and similar jobs with material less than 1 mm thick.
1800 W variant: the robust one for industrial geomembrane
- Thickness 0.8-4.0 mm
- Wider seam: 18 mm × 2
- 16 mm internal cavity
- Suitable for intensive on-site use
- Universal 50/60 Hz frequency
- Heavier: 13 kg net
- Higher power consumption
- Oversized for thin films
- Requires larger generator on-site without grid power
The 1800 W machine is the choice for professional welding of HDPE geomembrane in industrial applications: landfills, retention ponds, large capacity tanks, tunnel waterproofing, industrial agricultural reservoirs, waste dumps. Its allowable thickness range (up to 4.0 mm) covers the thickest geomembranes on the market, and the wide 18 mm seam provides superior mechanical resistance to the 800 W, which is critical in applications where joint integrity is fundamental for waterproofing. The more robust structure and heavier weight (13 kg net) make it suitable for intensive and prolonged use in industrial settings.
Variant comparison table
Both variants share heating temperature, welding speed, base voltage, and seam strength. They differ in power, allowable thickness, seam width, internal cavity, dimensions, and weight.
| Feature | 800 W | 1800 W |
|---|---|---|
| Ideal use | Thin films | Industrial geomembrane |
| SKU | 983422 | 232412 |
| Power | 800 W | 1800 W |
| Voltage | 220-230 V | 220 V |
| Frequency | — | 50/60 Hz |
| Material thickness | 0.2-1.0 mm | 0.8-4.0 mm |
| Welding speed | 0.5-5 m/min | 0.5-5 m/min |
| Temperature | 0-450 °C | 0-450 °C |
| Seam width | 12.5 mm × 2 | 18 mm × 2 |
| Internal cavity | 12 mm | 16 mm |
| Overlap width | 10 cm (3.94 in) | 100 mm (3.94 in) |
| Seam strength | ≥85% base material | ≥85% base material |
| Dimensions | 40 × 25 × 28 cm | 46 × 32 × 45 cm |
| Weight | 5 kg / 10 kg | 13 kg net / 20 kg gross |
| Insulation | Class II | — |
Use case matrix → recommended variant
| If your case is… | Recommended variant |
|---|---|
| Greenhouse film welding | → 800 W |
| Welding tarpaulins or construction plastic | → 800 W |
| Liner for swimming pool, small pond, or Jacuzzi | → 800 W |
| HDPE geomembrane 0.5 mm for light waterproofing | → 800 W |
| HDPE geomembrane 1.0-2.0 mm for landfill or reservoir | → 1800 W |
| Industrial agricultural reservoir or water tank | → 1800 W |
| Tunnel or underground structure waterproofing | → 1800 W |
| Intensive professional use with thick material | → 1800 W |
Before welding each batch, perform a seam test on a sample of the same material to calibrate temperature and speed according to environmental conditions. The hot wedge works best with clean, dry material at moderate ambient temperature. Evaluate the seam with the manual pull test and, for critical works (landfills, ponds), with an air pressure or vacuum test. If working on site without mains electricity, size the generator appropriately: a stable 1.5 kW for the 800 W model and a stable 2.5–3 kW for the 1800 W model (starting peak may be higher). Keep the wedge and rollers clean at the end of each day to prevent adhesion that could ruin subsequent seams.
Do not use the 800 W machine to weld geomembranes thicker than 1.0 mm. The inner cavity (12 mm) and power (800 W) are not sufficient to achieve the uniform heat needed for thick sheets, which results in cold seams with resistance lower than declared. The joint may appear correct visually but fail under tension or over time, with serious consequences in critical waterproofing applications (landfills, industrial ponds). Always check the material thickness before choosing a machine and, if in doubt, opt for the 1800 W model.
800 W or 1800 W for your project?
Tell us what material you will be welding (type and thickness), the total planned seam length, and whether you are working with mains electricity or a generator. You will receive the exact power recommendation and calibration settings.
Frequently Asked Questions
What materials can it weld?
This machine welds thermoplastic materials by hot wedge fusion: HDPE geomembrane, LDPE geomembrane, polyethylene film (PE), polypropylene (PP), and other compatible thermoplastics within its temperature range (up to 450 °C). It is not suitable for materials such as rigid PVC (which requires a different process) or non-thermoplastic materials (vulcanized rubber, tarpaulins with synthetic textile mesh). Verify compatibility with the specific material's technical data sheet before welding.
What does double track seam (12.5 mm × 2 or 18 mm × 2) mean?
The hot wedge produces two parallel weld lines separated by an air channel. This allows for a pressure test by introducing air into the central channel after welding: if the pressure holds for a specified time, the seam is watertight. This is the standard quality control method for critical waterproofing projects (landfills, industrial ponds). Each track is 12.5 mm (800 W) or 18 mm (1800 W) wide, which gives the total effective weld width.
Does it require specific maintenance?
Yes. After each working day, clean the wedge and rollers with a non-abrasive bristle brush to remove melted material residue. Periodically grease the roller axles with high-temperature grease. Check the power cable for damaged insulation before each use. Consult the manufacturer's manual for thermostat and feed system inspection intervals. Geomembrane welding machines are professional equipment that provide long service life with regular maintenance but can fail prematurely without it.