Low Heat Setting

Tubing recovers well below 150°C. A low setting or variable control lets you shrink without melting JST housings, Dupont shells or nearby breadboard plastic.

Shrink Ratio

2:1 tubing halves its diameter and suits bare wire splices. 3:1 shrinks to a third, so one size slips over a bulky solder joint or connector and still grips the wire.

Adhesive Lining

Dual wall tubing has a glue layer that melts and seals the joint. Use it outdoors, on soil and water sensors and anywhere condensation can reach a splice.

Corded or Cordless

Corded guns are cheap and never run flat. Cordless guns are great for installs at a gate sensor or in a loft, if you already own the battery platform.

Nozzle and Stand

A reflector or narrow nozzle wraps heat around the tube. A stand or flat base lets you work hands-free while you hold the wire with helping hands.

If you already run DEWALT 20V MAX batteries, the DCE530B is the easiest way to shrink tubing anywhere. It reaches up to 990°F with two temperature settings, moves 6.7 cfm of air and DEWALT quotes up to 42 minutes of runtime on a 5Ah pack on the low setting. Flat and hook nozzles are included, and the hook style suits wrapping heat around a tube. It shines when an ESP32 install happens away from the bench: a gate sensor, a garage door controller, a loft-mounted LoRa node or a solar weather station on a pole.

The Milwaukee M18 Compact Heat Gun is designed around heat shrink. Milwaukee says it reaches operating temperature in under 7 seconds and measures just 6.4 inches long, which it calls its most compact electric heat gun. A guarded nozzle helps protect nearby wiring and a ladder hook keeps it handy. That small size is a real advantage inside an electrical box, behind a smart switch or next to a DIN rail ESP32 controller where a full-size gun will not fit.

5. SEEKONE 1800W Heat Gun with LCD Display

The SEEKONE 1800W heat gun adds what the Wagner guns lack: a large LCD and variable temperature from 122°F to 1112°F, with memory settings and 4 nozzles in the kit. Dial it down near a board for gentle shrinking, or turn it up for thick adhesive-lined tubing on power cables.

6. Wirefy 275 Piece 3:1 Dual Wall Heat Shrink Tubing Kit

The Wirefy 275 piece kit is 3:1 dual wall, adhesive-lined tubing in black, red, white, transparent and blue. The glue liner seals splices against moisture, making it the right choice for outdoor DS18B20 probes, soil moisture sensors, pump leads and anything in a damp enclosure.

7. Ginsco 580 Piece 2:1 Heat Shrink Tubing Kit

The Ginsco 580 piece kit gives you 2:1 tubing in 11 sizes and 6 colors. That huge spread of small diameters is perfect for everyday ESP32 work: insulating header pin joints, color-coding I2C and SPI leads and sleeving Dupont wire repairs.

8. 3M FP-301 Heat Shrink Tubing Color Assortment Kit

The 3M FP-301 Color Assortment Kit holds 133 tubes of 3M’s flexible 2:1 polyolefin tubing in assorted colors. It costs more per piece than generic kits, but you get consistent wall thickness and shrink behavior from a known brand, which suits labs and repeat builds.

One heat gun for everything

The Wagner HT1000.

Small parts near boards

The Wagner HT400.

Precise temperature control

The SEEKONE 1800W LCD.

Field installs, DEWALT batteries

The DEWALT DCE530B.

Tight boxes, Milwaukee batteries

The Milwaukee M18 Compact.

Outdoor, sealed splices

The Wirefy 275 dual wall kit.

Cheapest big tubing assortment

The Ginsco 580 kit.

Known-brand tubing

The 3M FP-301 kit.

Can I use a lighter or soldering iron instead of a heat gun?

You can in a pinch, but results are poor. A flame scorches and splits tubing and leaves soot, and a soldering iron shrinks unevenly and can melt through. A heat gun or a hot air rework station gives even heat all around the tube, which is what makes a neat, tight, reliable sleeve.

Should I buy 2:1 or 3:1 heat shrink tubing?

For most ESP32 wiring, 2:1 is fine and cheaper. Choose 3:1 when the tubing has to slip over something bulky, like an inline solder joint, a JST plug or a resistor in a sensor lead, and still shrink tightly onto the thinner wire either side. Adhesive-lined 3:1 is the go-to for waterproof outdoor splices.

What size heat shrink fits Dupont jumper wire or 22 AWG hookup wire?

Hookup wire in the 22 to 26 AWG range is roughly 1 to 1.6 mm across including insulation, so 2 to 3 mm tubing (about 3/32 to 1/8 inch) usually works for a single wire. Over a soldered splice go one size up. Always check that the recovered diameter is smaller than the wire you want it to grip.

Will a heat gun damage my ESP32 board?

It can if you point a full-power gun at the board. Use the lowest setting, keep the nozzle a few centimetres away, keep it moving and shield the board, or shrink tubing on leads before connecting them. Lower-temperature guns like the Wagner HT400 or a variable gun on a low setting reduce the risk.

Can a hot air rework station shrink tubing?

Yes. If you already own one, set it to around 200 to 300°C with a wide nozzle and it shrinks small tubing nicely and very precisely. A dedicated heat gun is faster for thick, adhesive-lined tubing and larger power cables.