BACKGROUND
Incheon, South Korea experiences sub-zero temperatures for extended periods every winter. Outdoor water pipes — especially in exposed rooftops, façades, farm irrigation systems and supply lines — are highly prone to freezing. Once frozen, pipe rupture risk rises sharply and the resulting downtime / replacement cost can be substantial. A stable and intelligent heating method is essential for avoidance.
CUSTOMER CHALLENGE
The customer previously used a two-piece heater structure that clamped onto the pipe from opposite sides. This did deliver heat, but:
the pipe surface received uneven heat distribution
thermal efficiency was low (heat loss to ambient on the “open” sides)
outdoor wind / moisture could cause temperature drift and premature aging
safety margin had to be manually controlled, increasing BOM complexity
For harsh outdoor application, this architecture could not ensure uniform, predictable thermal performance.
OUR SOLUTION
We designed a 360° wrap-around PTC pipe-heater sleeve, forming a continuous, full-contact heating interface around the pipe.
This structure directly solves the root cause — surface coverage.
Heat is not “point-based” or “two-sided” anymore. It is uniform around the circumference.
At the same time, because the heating core is PTC ceramic, the heater is inherently self-regulating:
when ambient is cold → resistance decreases → heater automatically delivers higher wattage to prevent freezing
when the pipe approaches the designed set-point → resistance increases → output drops → no overheating, no runaway risk
So the heater automatically balances itself without external thermostats, sensors or MCU control loops.
This is extremely valuable in outdoor installations where stability, simplicity and passive safety > complex control.
OUTCOME
The customer achieved:
better thermal uniformity
lower field failure risk
significantly more stable winter performance
reduced component count (no PID / no relay / no sensor needed)
lower service / maintenance overhead
The wrap-around PTC design now enables a robust freeze-protection system that continuously adapts to changing winter weather — wind chill, night/day temperature swings, humidity — while maintaining safe, energy-efficient operation through the entire heating season.
