On the line, a weak DIY heater for glass bottle cutting doesn’t just slow you down—it turns into scrap. When the scoring zone heats unevenly, thermal stress builds and the cut goes sideways. We built this heating module to deliver repeatable, localized heat so every bottle parts clean, without micro-cracks that show up later. What matters under the hood We run a short-wave quartz infrared emitter, tuned to how soda-lime glass absorbs. The unit puts out 1200 W, runs on 220 V, and the 200 mm form factor drops into standard cutter fixtures without reworking the machine. It comes up to temperature in under 3 seconds, and the emitting surface holds steady within ±2% even when line voltage drifts. The ceramic body stands up to thermal shock, and the terminal block is rated for continuous duty. This isn’t a hobby coil—it’s a production part built to keep running. Why it plays well in high-throughput cutting Cycle time is money on a bottle line. Fast, targeted heating shortens the scoring window and cuts down on rework. The uniform thermal field keeps hot spots from forming and causing hairline fractures, so yield improves and scrap drops. Energy use falls compared to broad-area heaters, and the module swaps into existing mounts, keeping changeover under 10 minutes. For glass processors, that means more parts per shift, consistent quality, and operating costs that behave predictably. The shop-floor details you can’t skip Mounting tolerance has to be tight—shift the emitter 1–2 mm and the hot zone moves, which can throw the cut. Keep the emitter face clean; coatings and residues change emissivity and skew the temperature curve. The quartz envelope handles thermal shock, but it will crack on mechanical shock, so treat it carefully during install. Match lead length and connector rating to the cutter’s wiring to avoid voltage drop and terminals running hot. Keep a spare on hand—downtime here is measured in minutes, not hours.