Herbert Arnold Concentric-Ring Burners: The Zenit and Its Quiet, Precise Flame
Short answer: Herbert Arnold (part of the German Arnold Gruppe) makes the Zenit, a noiseless, surface-mix bench burner built around a concentric-ring burner face. Instead of stacking several independently controlled “stages” the way some boro torches do, the Zenit uses one ring-based head that a special flame-stabilizing system keeps quiet and steady, adjusted from a sharp pin-point to a large bushy flame by a single twist grip. That stabilizing system lets it run with a surplus of air for a cooler, calmer flame, which is why the Zenit is prized for precise, scientific glasswork and by beadmakers who want a smooth, silent flame. It comes in 40 mm, 50 mm, and 65 mm head sizes, plus the larger Big Arni bench burner and matching hand torches.
If you’re new to how torches combine fuel and oxygen, read surface mix vs premix torches first; this article focuses on Arnold’s particular concentric-ring approach.
Who Herbert Arnold / Arnold Gruppe is
Herbert Arnold isn’t a torch boutique — it’s a long-established German glass-machinery company. The business was founded on 1 October 1950 in Weilburg, Germany, and grew into “one of the worldwide leading manufacturers of burners, tools and machines as well as ready-to-use systems” for glass and quartz-glass processing, photovoltaics, fiber optics, and more. Sources: Arnold Gruppe, Arnold Gruppe.
That heritage matters for context. Arnold’s roots are in laboratory and quartz-glass apparatus, not pipe production — so its burners are engineered around the values that scientific glassblowing prizes: a stable, quiet, controllable, repeatable flame. When dealers describe these as precision instruments, that reflects a company whose core market has always been technical glass. Dealers commonly cite Arnold as having 60-plus years of burner experience, which fits the 1950 founding. Source: ABR Imagery.
The concentric-ring face: how the Zenit is designed
A concentric-ring burner arranges its jets in rings around a common center, all firing into one coordinated flame. The Zenit is a surface-mix design — fuel (propane) and oxygen stay separate until they leave the burner face and combust at the surface — which already gives it the gentle, adjustable character surface mix is known for. Source: Mountain Glass.
What sets the Zenit apart is its flame-stabilizing system. Arnold describes the Zenit as a “noiseless bench burner with special flame stabilizing system that allows the burner to operate with a surplus of air — therefore — with a cooler flame.” Source: Mountain Glass. In plain terms, the head is built so the flame stays anchored and even even when you feed it extra air, which both quiets it and lets you run it cooler than a flame at full intensity.
The result is a flame that is “stable” and “tight-knit,” ranging “from a sharp & concentrated pin-point flame to intensive flames, easily adjustable by single twist grip.” Source: Mountain Glass. On larger heads, Arnold’s own literature describes a separately controllable middle jet that adds a “high heating capacity and concentrated heating zone,” so you can tighten the core of the flame independently of the outer rings. Source: Arnold Gruppe.
Concentric-ring face vs independently controlled “stages”
It’s worth drawing the distinction carefully, because both Arnold and some American boro torches use rings of jets — but they’re tuned for different priorities.
- A multi-stage boro torch (think the larger GTT torches) gives you several rings, each on its own valve/pedal, so you can switch whole rings on and off to scale bulk heat up and down dramatically.
- The Zenit emphasizes one coordinated, stabilized concentric-ring flame that you sweep smoothly across its range with a single twist grip (with that separately controllable middle jet on bigger heads for the hot core). The design goal is a continuously variable, silent, repeatable flame rather than maximum staged firepower.
Neither is “better” in the abstract — they reflect different jobs. Arnold optimizes for smooth, quiet precision; the big staged torches optimize for scalable production heat. For the underlying surface-mix-vs-premix mechanics that both build on, see surface mix vs premix torches.
Why it’s known for a quiet, precise flame
Two engineering choices give the Zenit its signature character.
The “silent” working principle. Arnold repeatedly calls the Zenit a noiseless burner, and lists a “silent principle of working” among its core advantages. Source: ABR Imagery. In a shared studio or a quiet lab, a torch that doesn’t roar is a real comfort advantage — and a steady, low-noise flame is easier to “read” while you work.
Stabilized, homogeneous flame formation. Because the flame-stabilizing system keeps combustion anchored and even, the Zenit holds a homogeneous, variable flame from “needle flame to bushy flame,” infinitely variable by the single twisting grip. Source: ABR Imagery. For precise work — sealing, fine detail, scientific joints — a flame that stays put and transitions smoothly is worth more than raw heat.
The build supports that precision reputation: the burner head is “solid, made from no scaling stainless steel,” mounted on a “solid cast iron foot with ball joint” for stable, repeatable positioning. Source: Mountain Glass. Arnold’s own materials note brass burner tubes, valves, and cap with stainless-steel jets, and ball-valve flame control for near-maintenance-free operation. Source: Arnold Gruppe.
The Zenit sizes: 40, 50, and 65 mm
The Zenit bench burner is offered in three head diameters, scaling the flame for progressively larger glass. The numbers below come from Arnold and its dealers; confirm the current spec before buying.
| Model | Head diameter | Glass capacity (boro tubing) | Notes |
|---|---|---|---|
| 40 mm Zenit | 40 mm | Up to ~80 mm diameter tubing | Smallest; detail and bead/precision work |
| 50 mm Zenit | 50 mm | Between the 40 and 65 mm | Mid-size general bench burner |
| 65 mm Zenit | 65 mm | More than ~100 mm diameter tubing | Largest; ~70 mm max flame diameter |
Sources: Mountain Glass, Mountain Glass. (Exact tubing figures for the 50 mm head are less consistently published than the 40 and 65 mm; it sits between them, so verify with the dealer if that size is your target.)
All three are surface-mix, noiseless, propane-and-oxygen burners on the cast-iron ball-joint foot, with the same single-twist-grip control philosophy — you’re choosing how much flame you need, not a different operating concept. There are also cosmetic and configuration variants in the wild (single versus double valve, decorative engraved heads, and an electronically ignited Zenit E); treat those as options on the same core burner and confirm details per listing.
Big Arni and the hand torches
Beyond the bench Zenit, Arnold’s flameworking range includes a couple of forms worth knowing.
Big Arni is a larger bench burner positioned for “beads and small handicrafts made of glass,” and described as a 15-jet professional torch with independent gas and oxygen adjustments for control, on the same cast-iron base with ball joint. It uses a surface-mix system that grants safety against backfire and a two-zone adjustment so it suits both small and larger work; one listing gives a 28 mm head diameter and roughly 40 mm glass capacity. Source: ABR Imagery.
Zenit hand torches apply the same silent-burner principle in a handheld form. Arnold builds these with the burner head and control part separated — gas runs from a fixed control part to the hand piece through flexible hoses — so you keep ball-valve control while freeing the head to move. A representative hand torch lists a 40 mm head, ~40 mm max flame diameter, and the same “needle flame to bushy flame” infinitely variable range, “ideal for reworking borosilicate glass.” Source: ABR Imagery. Arnold’s broader catalog also includes a family of 141/3 hand burners; if you’re shopping specific hand- torch variants, match the model code to the dealer listing, since the precise configurations vary.
Who the Zenit suits
The Zenit’s strengths point clearly at certain users:
- Scientific and technical glassblowers who need a precise, repeatable, stabilized flame for sealing and detail work — squarely in Arnold’s laboratory-glass heritage.
- Beadmakers and soft-glass artists who specifically want a smooth, quiet, gentle flame and value continuous single-grip adjustment over staged firepower.
- Anyone in a noise-sensitive space (shared studio, classroom, lab) where a noiseless burner is a genuine quality-of-life upgrade.
Where it’s less of an obvious pick is high-volume borosilicate pipe production, where artists often reach for the very large multi-stage torches built to throw enormous, scalable heat. The Zenit can absolutely work boro — the 65 mm head handles tubing over ~100 mm — but its design philosophy is precision and calm, not maximum staged output.
Be honest with yourself about what you’re optimizing for, and confirm the exact configuration and glass capacity with the maker or a dealer before buying. For fitting any torch into your overall setup — oxygen, fuel, and budget — see the complete glass torch buyer’s guide, and read more about the maker on the Herbert Arnold maker page.
Key takeaways
- Herbert Arnold (Arnold Gruppe) is a German glass-machinery maker founded in 1950 in Weilburg, with deep roots in scientific and quartz-glass work.
- The Zenit is a noiseless, surface-mix, concentric-ring bench burner with a flame- stabilizing system that lets it run cooler on a surplus of air.
- It favors smooth, continuous control — pin-point to bushy via a single twist grip — over multiple independently switched “stages”; larger heads add a separately controllable middle jet for a hot core.
- Built for durability: no-scaling stainless-steel head, brass body, cast-iron foot with ball joint, ball-valve control.
- Offered in 40 / 50 / 65 mm heads (handling roughly ~80 mm up to >100 mm boro tubing), plus the 15-jet Big Arni bench burner and Zenit hand torches.
- Best for precise scientific work and beadmakers wanting a quiet, gentle flame; less aimed at high-volume staged boro production. Verify specs with the maker/dealer before buying.
Sources
- Arnold Gruppe, “History” — https://www.arnold-gruppe.de/index.php?L=1&id=105
- Arnold Gruppe, “Company” — https://www.h-arnold.com/company
- Mountain Glass, “Herbert Arnold - 40mm Zenit” — https://www.mountainglass.com/40mm-Zenit-Herbert-Arnold
- Mountain Glass, “Herbert Arnold - 65mm Zenit” — https://www.mountainglass.com/65mm-Zenit-Herbert-Arnold
- ABR Imagery, “Herbert Arnold Big Arni Torch” — https://abrimagery.com/products/herbert-arnold-big-arni-torch
- ABR Imagery, “Herbert Arnold Zenit Hand Torch” — https://abrimagery.com/products/herbert-arnold-zenit-hand-torch
Editor’s note: specifications, sizes, and model variants reflect Arnold Gruppe’s own pages and dealer listings (Mountain Glass, ABR Imagery) as of 2026; some figures (especially the 50 mm head and individual hand-torch variants) are inconsistently published, so confirm the current spec with the maker or dealer before purchase.