You already know you need a manual hot air gun for patches, overlaps and rod welds. The harder question is which Weldy Energy set to order: Weldy sells the HT1600, HT1600D and HT3400 in factory kits, each built around a different welding method. This guide covers what is in each box and which nozzle does what.
1. Why Buy a Kit Rather Than a Bare Gun?
Weldy kits bundle the right nozzles, a pressure roller and spare carbon brushes with the gun, matched to one technique — rod welding, overlap welding or shrinking. Buy separately and you risk the wrong nozzle seat or a roller you never use; a kit arrives ready to weld. So the kit line matters more than the model number: the Plastic kit welds with filler rod, the Overlap kit welds membrane seams, the Shrink kit shrinks and forms.
2. First, the Guns: HT1600 vs HT1600D vs HT3400
| Specification | Energy HT1600 | Energy HT1600D | Energy HT3400 |
|---|---|---|---|
| Power | 1,600 W | 1,600 W | 3,400 W |
| Temperature range | 40–700 °C | 40–620 °C | 40–650 °C |
| Temperature control | Stepless dial | Digital, via LCD (stepless) | Stepless dial |
| Airflow at 20 °C | 240 l/min | 120–240 l/min, stepless | 320 l/min |
| Static pressure | 2,600 Pa | 2,600 Pa | 3,000 Pa |
| Nozzle connection Ø | 31.5 mm | 31.5 mm | 50 mm |
| Weight | 0.99 kg | 1.2 kg | 1.28 kg |
| Voltage | 120 V / 230 V | 120 V / 230 V | 230 V |
| Extras | — | Configurable parameter settings, cool-down, overheating protection, dust filter | — |
All figures per Weldy’s official technical sheets (HT1600 art. 120.881; HT1600D art. 160.176; HT3400 art. 128.669). All three models share a ceramic heating element, 3 m power cable, 67 dB(A) noise level, CE approval and protection class II.
3. The Kit Line-Up: What Each Energy Set Actually Contains
| Set | In the box | Built for |
|---|---|---|
| HT1600 (standard unit) | Heat gun, 28-language manual | General heat work when you already own nozzles |
| HT1600 Plastic Welding Kit | HT1600 + 5 mm tube nozzle (147.250) + 4 mm speed-welding nozzle (146.740) + spare carbon brushes (125.810) | Filler-rod welding of tanks, pipes and boats |
| HT1600 Overlap Welding Kit | HT1600 + 40 mm slot nozzle (124.777) + 20 mm slot nozzle (124.772) + 40 mm silicone pressure roller (130.611) + spare carbon brushes (125.810) | Overlap seams in PVC/TPO membranes and tarpaulins |
| HT1600D Plastic Welding Kit | HT1600D + 5 mm tube nozzle (147.250) + 4 mm speed-welding nozzle (146.740) + spare carbon brushes (125.810) | Rod-welding jobs with digital control and dust filter |
| HT1600D Overlap Welding Kit | HT1600D + 40 mm slot nozzle (124.777) + 20 mm slot nozzle (124.772) + 40 mm silicone pressure roller (130.611) + spare carbon brushes (125.810) | Overlap seams and foil shrinking with repeatable settings |
| HT3400 (standard) / HT3400 Shrink Kit | 3,400 W gun; Shrink kit adds a reflector nozzle + 50 mm slot nozzle | High-output heating and large-area shrinking |
Article numbers are given per the official Weldy catalogue so you can verify each set before ordering.
4. HT1600 or HT1600D: What the LCD Display Buys You
The HT1600 and HT3400 use a stepless dial — simple and reliable, and enough for most field work. The HT1600D replaces it with a digital LCD readout and Weldy’s configurable parameter settings, and the real benefit is parameter visibility: the operator can read the displayed settings at a glance, note them down, and recall the same configuration for the next seam, the next shift or the next identical job. On routine tarpaulin work that hardly matters; on an inspected project where a supervisor asks “what did you weld that seam at?”, the readout turns a guess into a documented answer. Choose the D when settings must be reproduced and manually documented; choose a dial model when simplicity and price matter more.
5. When the 3,400 W HT3400 (and Its Shrink Kit) Is the Right Call
The HT3400 is Weldy’s high-output gun in the Energy family: 3,400 W, higher airflow (~320 l/min) and static pressure (~3,000 Pa), and a 50 mm nozzle connection. It suits large-surface heating and welding — wide membrane seams, fast pre-heating and thick-sheet bending — and, with the Shrink kit’s reflector and 50 mm slot nozzles, cable and film shrinking in packaging and automotive work. Its 50 mm nozzle and 1.28 kg weight make it less suited to fine corner work than the 31.5 mm HT1600 models; many crews keep both.
6. Match the Set to the Job
| Your job | Energy set to order |
|---|---|
| PVC/TPO roof overlaps and details | HT1600 Overlap Kit — or the D version for inspected seams |
| HDPE/LLDPE liner patch repairs (overlap patch) | HT1600 Overlap Kit; large patches: HT3400 + 50 mm slot |
| Tarpaulin, awning and banner seams | HT1600 Overlap Kit |
| Tank, pipe and HDPE boat repairs; fillet sealing of welded seams | HT1600 Plastic Kit or HT1600D Plastic Kit |
| Floor-covering welding, foil shrinking, vehicle wrap | HT1600D Overlap Kit |
| Cable and large-film shrinking, fast pre-heat, bending thick sheet | HT3400 with the Shrink Kit |
Two rules before you order: confirm the voltage (HT1600 and HT1600D come in 120 V and 230 V; the HT3400 is 230 V only), and always dial in with a test weld on scrap — ambient conditions shift the ideal heat setting.
7. Buy the Right Set with Confidence from Weissenberg
Weissenberg is an official Weldy distributor with 19+ years supplying thermoplastic welding equipment to 80+ countries. Every Energy kit ships genuine and CE-certified with a 1-year warranty and lifetime technical support, and spare nozzles, heating elements and brushes are kept in stock. Tell us what you weld (material, thickness, method) and we will confirm the right set before you order.
👉 Compare each set on its product page — Energy HT1600, Energy HT1600D and Energy HT3400, each with Plastic Welding, Overlap Welding or Shrink Kit options — or message our online team for a free selection consultation.
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