Nextflex is a custom flexible heater that features an inner layer of highly compressed copper powder, giving Nextflex increased durability while maintaining flexibility.
Nextflex’s robust design is engineered with a flexible solid casing that stays in the groove yet is easy to install.
The Nextflex custom flexible heater is conveniently marked at both the center and the cold sections for visual verification during installation.
Nexthermal can assist you in selection, installation, advice, and improving application performance.
Nextflex heaters are manufactured in the United States in Battle Creek, Michigan.
300 mm
350 mm
400 mm
425 mm
450 mm
475 mm
500 mm
525 mm
550 mm
575 mm
600 mm
625 mm
650 mm
675 mm
700 mm
725 mm
750 mm
775 mm
800 mm
850 mm
900 mm
950 mm
1000 mm
1050 mm
1100 mm
1150 mm
1200 mm
1250 mm
1300 mm
1350 mm
1400 mm
1450 mm
1500 mm
1550 mm
1600 mm
1650 mm
1700 mm
1750 mm
1800 mm
1850 mm
1900 mm
1950 mm
2000 mm
2050 mm
2100 mm
240 mm
290 mm
340 mm
365 mm
390 mm
415 mm
440 mm
465 mm
490 mm
515 mm
540 mm
565 mm
590 mm
615 mm
640 mm
665 mm
690 mm
715 mm
740 mm
790 mm
840 mm
890 mm
940 mm
990 mm
1040 mm
1090 mm
1140 mm
1190 mm
1240 mm
1290 mm
1340 mm
1390 mm
1440 mm
1490 mm
1540 mm
1590 mm
1640 mm
1690 mm
1740 mm
1790 mm
1840 mm
1890 mm
1940 mm
1990 mm
2040 mm
65R-0300 / 350 W
65R-0350 / 400 W
65R-0400 / 500 W
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65R-0450 / 600 W
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65R-0500 / 650 W
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65R-0550 / 700 W
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65R-0600 / 800 W
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65R-0650 / 850 W
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65R-0700 / 900 W
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65R-0750 / 1000 W
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65R-0800 / 1100 W
65R-0850 / 1200 W
65R-0900 / 1300 W
65R-0950 / 1350 W
65R-1000 / 1400 W
65R-1050 / 1450 W
65R-1100 / 1500 W
65R-1150 / 1550 W
65R-1200 / 1600 W
65R-1250 / 1650 W
65R-1300 / 1700 W
65R-1350 / 1800 W
65R-1400 / 1900 W
65R-1450 / 2000 W
65R-1500 / 2100 W
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80R-0300 / 560 W
80R-0350 / 675 W
80R-0400 / 795 W
80R-0425 / 850 W
80R-0450 / 910 W
80R-0475 / 970 W
80R-0500 / 1025 W
80R-0525 / 1090 W
80R-0550 / 1145 W
80R-0575 / 1200 W
80R-0600 / 1260 W
80R-0625 / 1320 W
80R-0650 / 1380 W
80R-0675 / 1440 W
80R-0700 / 1495 W
80R-0725 / 1550 W
80R-0750 / 1615 W
80R-0775 / 1670 W
80R-0800 / 1730 W
80R-0850 / 1845 W
80R-0900 / 1960 W
80R-0950 / 2080 W
80R-1000 / 2195 W
80R-1050 / 2316 W
80R-1100 / 2430 W
80R-1150 / 2545 W
80R-1200 / 2665 W
80R-1250 / 2780 W
80R-1300 / 2895 W
80R-1350 / 3015 W
80R-1400 / 3130 W
80R-1450 / 3245 W
80R-1500 / 3365 W
80R-1550 / 3480 W
80R-1600 / 3600 W
80R-1650 / 3600 W
80R-1700 / 3600 W
80R-1750 / 3600 W
80R-1800 / 3600 W
80R-1850 / 3600 W
80R-1900 / 3600 W
80R-1950 / 3600 W
80R-2000 / 3600 W
80R-2050 / 3600 W
80R-2100 / 3600 W
85R-0300 / 650 W
85R-0350 / 750 W
85R-0400 / 900 W
85R-0425 / 975 W
85R-0450 / 1050 W
85R-0475 / 1100 W
85R-0500 / 1150 W
85R-0525 / 1225 W
85R-0550 / 1300 W
85R-0575 / 1375 W
85R-0600 / 1450 W
85R-0625 / 1525 W
85R-0650 / 1600 W
85R-0675 / 1675 W
85R-0700 / 1750 W
85R-0725 / 1825 W
85R-0750 / 1900 W
85R-0775 / 1975 W
85R-0800 / 2050 W
85R-0850 / 2200 W
85R-0900 / 2350 W
85R-0950 / 2500 W
85R-1000 / 2650 W
85R-1050 / 2800 W
85R-1100 / 2930 W
85R-1150 / 3060 W
85R-1200 / 3190 W
85R-1250 / 3320 W
85R-1300 / 3450 W
85R-1350 / 3580 W
85R-1400 / 3600 W
85R-1450 / 3600 W
85R-1500 / 3600 W
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Bolded part numbers = Same-day shipping on orders placed by 2PM EST.
Starting at the center of the groove, bend the Nextflex custom flexible heater at the center mark consistent with the direction of the groove.
Hold the Nextflex heater directly above the groove at the point of installation. Strike the Nextflex heater hard to seat it well. Form and install in short lengths to prevent re-bending. Always start by installing the heater at the center mark at the center location of the groove.
It is important to make sure the Nextflex custom flexible heater is directly above the groove prior to striking. Form and install in 1-to-2-inch sections (25 to 50 mm).
The heater is flexible due to annealing. Multiple bends in the same location “work harden” the heater. For best results, form the heater as precisely as possible prior to installing in the groove.
While keeping the Nextflex heater flat and forming it with your free hand, bend the heater to match the groove.
One strong strike is more effective than two soft strikes. If your groove dimensions are correct, you will not damage the internal heater.
The Nextflex staking tool is a key component in the seating the heater properly. This improves heat transfer and maximizes heater life. Strike hard to stake every 3/4 in (about 20 mm).
Minimum Bending Radius (Inside)
Maximum Temperature
High Voltage Stability
Insulation Resistance
Leakage Current
Wattage Tolerance
Max Voltage
Diameter Tolerance
Length Tolerance
⌀ 8.0 / ⌀ 8.5 mm = R10 mm, ⌀ 6.5 mm = R6.5 mm
700 °F / 371 °C
1000 VAC
≥ 5 M @ 500 VDC
≤ 0.5 mA @ 253 VAC
± 10%
250 VAC
Nominal ⌀ ± 0.10 mm
± 1.5%
Minimum Bending Radius (Inside)
⌀ 8.0 / ⌀ 8.5 mm = R10 mm, ⌀ 6.5 mm = R6.5 mm
Maximum Temperature
700 °F / 371 °C
High Voltage Stability
1000 VAC
Insulation Resistance
≥ 5 M @ 500 VDC
Leakage Current
≤ 0.5 mA @ 253 VAC
Wattage Tolerance
± 10%
Max Voltage
250 VAC
Diameter Tolerance
Nominal ⌀ ± 0.10 mm
Length Tolerance
± 1.5%
