Herbert Arnold Zenit: the noiseless concentric-ring surface-mix burner

The Herbert Arnold Zenit is a noiseless, single-stage surface-mix bench burner built around a concentric-ring head rather than the stacked, independently controlled stages you see on many boro torches. A single twist grip carries it from a sharp pinpoint to a large, bushy flame, and a flame-stabilizing system keeps that flame quiet and even — the trait that has made the Zenit a favorite for precise scientific glasswork and for beadmakers who want a smooth, silent flame. It comes from Herbert Arnold, the long-established German glass-machinery maker at the premium European end of the craft.

What the surface-mix flame gives you

Like other surface-mix burners, the Zenit mixes fuel and oxygen at the face of the torch rather than inside the body, which keeps the mixing chamber cooler and gives a clean, controllable flame. What sets the Zenit apart is its flame-stabilizing system: it can run with a surplus of air for a cooler, calmer flame, and the result is the burner’s signature noiseless character. For the broader background on how surface mix differs from premix, see surface mix vs premix torches; for Arnold’s particular concentric-ring approach, see Herbert Arnold concentric-ring burners.

Who the Zenit is for

The Zenit suits precise scientific and technical glasswork, beadmaking, and small-to-medium boro and soft glass — makers who value a quiet, controllable, repeatable flame over raw production heat. It’s typically an intermediate-to-advanced burner rather than a first torch; this is a premium specialist tool, and most beginners start cheaper. If you’re weighing it against other options, our how to choose a glass torch guide walks through the trade-offs.

Glass, fuel, and sizing the head

The Zenit (model 114/21) is made in three head sizes — 40mm, 50mm, and 65mm — so you can match the burner to the work. Herbert Arnold notes the 40mm head works borosilicate tubing up to roughly 80mm; the larger heads step the flame up for bigger pieces. It runs propane or natural gas with oxygen, plus optional compressed air. Its exact oxygen flow (LPM) isn’t published, so match your oxygen supply to the head size and the work you actually do before you commit — see how many LPM does my torch need and oxygen concentrator vs tanks.

Dialing the flame

Where multi-valve boro torches ask you to balance several fires, the Zenit keeps it simple: a single twist grip adjusts the flame from a sharp pinpoint up to an intensive, bushy flame. Combined with the stabilizing system, that makes for a forgiving, predictable burner once you’ve learned its range — part of why it earns its place in scientific labs and quiet studios.

Before you buy

Budget for the whole system, not just the torch: oxygen (tanks or a concentrator), the correct propane or natural-gas regulator, flashback arrestors on both lines, didymium eyewear, and ventilation. As a high-end German burner, sourcing, support, and parts can be less convenient outside Europe, so it’s worth a conversation with a knowledgeable dealer about the right head size and configuration. New to plumbing a torch? Start with the fittings, hoses & connectors guide and the glass torch safety setup guide.

Editor’s note: spec details (head sizes, the model number, and the flame-stabilization and compressed-air features) reflect Herbert Arnold’s own materials and dealer listings. Herbert Arnold doesn’t publish the Zenit’s exact oxygen flow (LPM) or current pricing, so confirm those specifics — and the right head size for your work — with Herbert Arnold or your dealer before purchasing.