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Estimated delivery 6-8 weeks from order date.
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Long before fire pits were patio furniture, the cauldron was humanity's original gathering vessel — the shape of competition, nourishment, and ceremony across classical antiquity. Studio Nisho's Kratos reclaims that primal silhouette and refines it: a round, hand-cast concrete vessel that speaks to something instinctive in everyone who pulls a chair toward it.
Available in three diameters — 36, 42, and 48 inches — Kratos is the rare fire feature that scales to fit your space without diluting its presence. Each size is cast from glass fiber reinforced concrete in one of four architectural finishes and built around a Warming Trends Crossfire brass burner delivering up to 190,000 BTU of tall, brilliant flame.
The round vessel puts every seat at equal distance from the flame — no head of the table, no bad angle, just an unbroken circle of warmth.
Choose 36, 42, or 48 inches to match your patio's scale — the proportions hold across every size, so the design never feels stretched or shrunken.
Warming Trends' brass jet technology produces a taller, brighter, fuller flame resembling a natural wood fire — while drawing noticeably less fuel than conventional ring burners.
Glass fiber reinforced concrete is cast by hand in Denver, embedding alkali-resistant glass fibers throughout the matrix for stone-like presence without the crushing weight.
A 1/2-inch pipe connection accepts either fuel, so Kratos adapts to your property whether you're plumbing a line or running a concealed tank.
Developed and photographed in Colorado snow, Kratos is built for year-round outdoor life — fire season doesn't end when summer does.
The choice between a round and square fire feature isn't just aesthetic — it changes how people gather. Kratos is Studio Nisho's argument for the circle, and it's a persuasive one.
A round vessel creates natural, democratic seating — chairs drift into a circle on their own, conversation flows across the flame instead of around corners, and nobody ends up at the "end" of the fire. For hosts, that geometry does half the entertaining for you.
Hardscapes are built from straight lines — pavers, walls, fence runs. A single strong curve breaks that grid beautifully. Kratos reads as sculptural relief against rectilinear patios, and its low 14-inch profile keeps the composition grounded rather than bulky.
Casting a clean, continuous curve in concrete is harder than casting a box — it demands precise molds, even fiber distribution, and a finisher's hand that knows the material. Studio Nisho does all of it in-house in Denver, where every Kratos vessel is cast from glass fiber reinforced concrete: alkali-resistant glass fibers embedded through the entire matrix for strength that plain concrete can't match.
The payoff is a vessel with the visual mass of carved stone at 200–400 pounds depending on size — heavy enough to feel permanent, manageable enough to install without heavy equipment. The brass Crossfire burner beneath the fire surface is chosen for the same longevity, machined from material selected to resist rust and corrosion through years of seasons outdoors.
As with all artisan concrete, minor variations in color and texture are natural to each hand-applied finish, and fine hairline lines may appear as the vessel cures and releases moisture. These characteristics are normal for architectural concrete, don't affect structural soundness, and are part of what makes your Kratos genuinely one of a kind.
All three diameters share the same 14-inch height, cauldron profile, and included hardware — the right choice comes down to your space and how many people you gather.
The intimate scale — ideal for courtyards, compact patios, and couples' seating for four. Big cauldron presence in a footprint that leaves room to circulate.
The sweet spot for most backyards — comfortable circle seating for five to six, generous flame presentation, and easy clearance planning on standard patios.
The entertainer's scale — a commanding centerpiece for large patios and outdoor rooms, with room for eight or more chairs in the circle.
Light, warm neutral that keeps the cauldron form feeling airy.
Versatile mid-grey that suits nearly any hardscape palette.
Deep charcoal that gives the curve real gravity after dark.
Near-black intensity — the boldest stage for the flame.
Finish note: every concrete finish is hand-applied and unique to its vessel. Expect subtle variation from sample photos — it's the signature of a genuinely handcrafted piece.
The burner's 1/2-inch connection runs on either fuel. Natural gas is the set-and-forget choice where a line exists or can be trenched; propane keeps installation simple everywhere else. A licensed gas professional should complete the final hookup and size the supply for full burner output.
| Specification | Detail |
|---|---|
| Available Sizes | 36" · 42" · 48" diameter 3 Sizes |
| Dimensions (36") | 36" L × 36" W × 14" H |
| Dimensions (42") | 42" L × 42" W × 14" H |
| Dimensions (48") | 48" L × 48" W × 14" H |
| Weight | 200–400 lbs (varies by size) Freight Delivery |
| Vessel Material | Glass fiber reinforced concrete (GFRC) Handcrafted |
| Burner System | Warming Trends Crossfire brass burner Premium Brass |
| Heat Output | 120,000–190,000 BTU (scales with size) High Output |
| Fuel Compatibility | Natural gas or liquid propane Dual Fuel |
| Gas Connection | 1/2" pipe opening |
| Media Fill | Black rolled lava rock (included) |
| Finish Options | Birch · Smoke · Carbon · Onyx 4 Finishes |
| Cover | Black marine-grade cover with Nisho logo (included) |
| Origin | Handcrafted in Denver, Colorado Made in USA |
Every Kratos size ships as a complete fire feature, securely crated for freight and ready for professional hookup.
Made-to-order craftsmanship: each Kratos is hand-cast and hand-finished after your order is placed, which is why these pieces are final sale. Call or email before ordering and we'll confirm current production timelines for your size and finish.
Round fire features shine with breathing room. Plan roughly 5 to 7 feet of clear space from the vessel's edge for chairs and walkways so the full circle stays usable — that means a 42-inch Kratos comfortably anchors a seating zone around 14 to 16 feet across. Set the vessel on a level, non-combustible surface such as concrete, stone, or pavers.
Warming Trends specifies 120 inches of vertical clearance and 36 inches of lateral clearance from combustible structures or materials, plus 18 square inches of venting on opposing sides of the feature. Your installer should confirm these against local code — the full clearance diagram is linked below.
Rough in the gas stub before delivery day, positioned per the Warming Trends diagram. A licensed gas professional will make the final connection and size the supply line so the burner reaches its full output — the flex line arrives factory-marked to keep the hookup clean.
Kratos ships free via LTL freight with curbside delivery — free shipping on all orders, always. Depending on size the vessel weighs 200 to 400 pounds, so have two or more people (or a heavy-duty dolly) ready to move it from the curb to its final home.
Match the vessel to your seating plan, not just your square footage. The 36-inch suits four chairs and compact courtyards; the 42-inch is the most versatile pick, seating five to six comfortably on a standard patio; the 48-inch anchors large outdoor rooms with eight or more in the circle. If you're between sizes, measure your intended seating zone and call us at 833-777-2962 — we'll help you map it out.
Yes — each vessel size carries a Crossfire burner proportioned to its opening, with outputs spanning 120,000 to 190,000 BTU across the range. Every size delivers the burner's signature tall, bright flame; larger vessels simply spread more of it. The included key valve lets you dial output down for quiet evenings regardless of size.
Studio Nisho has produced Kratos in larger custom dimensions for select projects. If your design calls for an oversized centerpiece, contact us at 833-777-2962 or info@smokeforges.com and we'll explore custom options with the manufacturer on your behalf.
Think about how your guests actually sit. Round features like Kratos create a natural, equal circle — great for conversation-centered gatherings and freestanding placement in open space. Square features like the Nisho Chaos or Cronus align cleanly with walls, seat walls, and linear hardscape. Neither is better; they organize a patio differently.
That's what it was built for — Studio Nisho develops its GFRC vessels in Colorado's freeze-thaw climate, and Kratos is regularly photographed running in the snow. Keep the marine-grade cover on between uses, clear debris before lighting, and let damp lava rock dry out for about 30 minutes on first light after wet weather.
Low-maintenance by design: an occasional gentle wash with a few drops of mild detergent in warm water and a microfiber towel keeps the finish fresh, and a spray beeswax polish can be applied afterward for extra luster. Keep the included cover on when idle — it protects both the finish and the burner hardware.
Yes — Studio Nisho stands behind its craftsmanship with a manufacturer warranty, and as an authorized Studio Nisho dealer, Smokeforges ensures your purchase is registered and supported through official channels. Reach out for current warranty terms on the Kratos.
Planning resources for you, your designer, and your gas professional.
Dimensioned top and front drawings of the Kratos vessel and burner plate zone for contractors and designers.
View Spec DrawingInstaller notes, lava rock placement, ignition and shutdown procedures, and the concrete care guide.
View GuideWarming Trends clearance requirements, venting specifications, and gas stub placement details.
View DiagramFree shipping on all orders, straight answers on sizing and clearances, and authorized dealer support from order through first flame. Not sure which diameter fits your patio? That's a two-minute conversation.
Call 833-777-2962Prefer email? Reach us at info@smokeforges.com
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