Optim-Tec | RW3400 Roofer 230V 3500W Automatic Roofing Hot Air Welder + 40mm Overlap Nozzle

RW3400 Product Introduction

- Speedcan be freely selected from 1-7.5m/min

- 3400W hot air blower, powerful performance, easily achieve the ideal temperature and air volume

- Automatic starter for ideal welding start

- Guide station and handles for ergonomic operation

- Built-in laser guide

Specifications

Device Model	roofer RW3400
Voltage (V)	230
Power(W)	3500
Welding width(mm)	40
Temperature(℃)	20-600
Speed(m/min)	1.0-7.5
Dimensions (length x width x height) mm	445×280×320
Weight(kg)	15
plug	16A CEE certified plug / European standard plug

Applications

WELDY roofer RW3400 is a professional and lightweight roofing welding machine. The welding quality of this manual hot air welder is comparable to that of a large welder: a handheld device, convenient and easy to use! The lightest model in the same class of Leister! (only 15 kg).

15 CUSTOMER REVIEWERS

5 STARS

4 STARS

3 STARS

2 STARS

1 STARS

15 comments

Marlowe

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Bought for commercial roof work. Powerful blower, welds hold up well. Got good support from the shop when I needed tips.

Sydney

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Nice auto roof welder. Auto start works well, no hassle.

leah999

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Awesome roofing hot air welder. Lightweight 15kg design, adjustable speed temp. Laser guide keeps weld seams neat. 40mm nozzle included. Reliable for membrane roof work.

Brody

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This RW3400 roof welder is a total game-changer for my roofing jobs. The built-in laser guide helps keep my weld lines straight every single time. Definitely worth the investment, will recommend it to my crew.

Frederick

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This RW3400 roof welder works really well on our jobsites. Speed adjusts smooth, laser guide helps keep lines straight. Saves so much time doing roof membranes, totally worth it.

mike_t4

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Solid machine! At 15kg, it’s way lighter than my old welder, used it on a flat roof today, smooth operation and strong seams. Highly recommend!

Mateo

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good price, I urgently needed this machine for my work, and the customer service team helped me expedite the order, many thanks……

benz560s

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good seller we buy again

rudrud_master

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item as described, and works as it should. Pleased with my purchase.

pokewigger

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Built tough for daily use on the roof. Handles TPO and PVC membranes like a champ—even in windy conditions. Worth every penny.

armored_57

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This roof seaming machine saved us hours on a commercial EPDM job. Consistent heat, smooth travel, and watertight seams every time.

kennyinv

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This roof welding machine exceeded our expectations. It heats up quickly, delivers consistent, strong seams, and significantly speeds up our roofing workflow. The welds are clean, durable, and completely watertight—no leaks even after heavy rain. Built solid with high-quality components, it handles long hours of continuous use without overheating. Easy to operate, even for new crew members. Highly recommended for any professional working on membrane roofing or waterproofing projects!

enozptm

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Easy transaction and fast shipping. Everything as listed. Repeat customer with this merchant.

contabila

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Amazing seller!! All the items arrived in perfect condition as described everything was packed with great care! Will definitely buy here again highly recommend!!

Kevin777

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It's incredibly versatile and has come in handy for all sorts of tasks around the house. The installation process was quick and easy, and the adjustable temperature control makes it easy to find the right settings for whatever I'm working on. Highly recommended!