Product details
# RW-B2 Vertical Live Steam Boiler (500mL)
## Heavy-Duty Copper Power Plant with Hardwood Insulation | Engine-Ready Marine Boiler for 70–150cm Scale Boats
### **Built for the Open Water: Premium Live Steam Performance**
Nothing rivals the timeless charm of a live steam ship slicing through open water on a clear summer day. Designed specifically for scale marine builders and model shipwrights, the **RW-B2 Vertical Boiler** delivers the exact pressure, thermal efficiency, and vintage aesthetic your marine engine demands. Whether you're upgrading a working RC steamboat or building a museum-worthy display piece, the RW-B2 serves as the ultimate high-output heart for your vessel.
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### **Why Live Steam Enthusiasts Choose the RW-B2**
* **Silver-Brazed Solid Copper Core:** Hand-assembled from heavy-gauge copper and joined via high-temperature copper-silver brazing. Built to comfortably handle continuous thermal cycles and working pressures up to 4 kg/cm² (57 PSI) without seam breakdown.
* **Authentic Hardwood Thermal Jacket:** Wrapped in an insulated, hand-finished hardwood casing that isn't just for show—it drastically minimizes radiant heat loss, boosts boiler efficiency, and keeps fuel consumption low.
* **High-Efficiency Curved Burner Tube:** Features a seamless, integrated curved burner designed for butane gas. The unique geometry maximizes flame contact across the 500mL water chamber, achieving faster warm-up times and stable steam production.
* **Superheated Steam for Peak Efficiency:** Includes an internal superheater line that dries out wet steam before it reaches your engine's cylinders, preventing water lock and delivering smooth, crisp piston strokes.
* **Fail-Safe Monitoring & Control:** Complete peace of mind on the water. Outfitted with **dual pop-off safety valves** (preset to 4.5–5 kg/cm²), a heavy-duty **0–6 Bar pressure gauge**, and a clear sight-glass water level indicator.
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### **Direct-Fit Compatibility with Stirlingkit Engines**
Engineered with standard **M7 × 0.75** steam line threading, the RW-B2 drops seamlessly into your RC hull layout and pairs directly with our premier marine engines:
* [**RW-V4 Marine Engine**](https://www.stirlingkit.com/products/rw-v4-miniature-4-cylinder-steam-engine-v4-engine-model-for-90-150cm-boat-models) — *Miniature 4-Cylinder Steam Engine (Ideal for 90–150cm hulls)*
* [**RW-V2 Marine Engine**](https://www.stirlingkit.com/products/rw-v2-mini-dual-cylinder-v2-reciprocating-steam-engine-precision-model-for-70-130cm-boats) — *Mini Dual-Cylinder V-Type Steam Engine (Ideal for 70–130cm hulls)*
* [**RW-L2 Marine Engine**](https://www.stirlingkit.com/products/rw-l2-retro-precision-mini-reciprocating-inline-twin-cylinder-steam-engine-model) — *Inline Twin-Cylinder Steam Engine (Ideal for 70–130cm retro hulls)*
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### **Technical Specifications**
| Feature | Specification |
| :--- | :--- |
| **Model** | RW-B2 Vertical Steam Boiler |
| **Boiler Shell** | Heavy-Gauge Copper (Silver-Brazed) |
| **Exterior Insulation** | Hand-Finished Hardwood Jacket |
| **Water Capacity** | 500 mL (~17 oz) |
| **Fuel System** | Butane Gas (Curved Burner Tube) |
| **Operating Pressure** | 2.0 – 4.0 kg/cm² (28.4 – 56.8 PSI) |
| **Safety Relief Setting** | 4.5 – 5.0 kg/cm² (64 – 71 PSI) |
| **Thread Interface** | M7 × 0.75 mm |
| **Boiler Dimensions** | 90mm Dia. × 140mm H (120mm Chimney) |
| **Overall Dimensions** | 12 × 9 × 14 cm |
| **Net Weight** | 1.5 kg (3.3 lbs) |
| **Recommended Hull Length** | 70 – 150 cm (27.5" – 59") |
| **Target Age Group** | 16+ |
**What’s in the Box:**
* 1× RW-B2 Vertical Live Steam Boiler Assembly
* 1× Integrated Curved Burner System & Pressure Gauge
* 1× User Manual & Safety Operation Guide
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### **Frequently Asked Questions (FAQ)**
**Q1: Is this boiler handmade, and do you currently have stock available?**
**A:** Yes! Each RW-B2 boiler is meticulously **hand-assembled and precision-brazed by experienced master craftsmen**. Due to the intricate artisan manufacturing process, production is strictly limited. We currently have an **exclusive batch of just 20 units in stock and ready for immediate dispatch**. Once sold out, the next production run may take several weeks.
**Q2: How long does shipping take, and do you ship worldwide?**
**A:** We provide **worldwide tracked express shipping** to North America, Europe, Australia, and East Asia. In-stock orders are processed and dispatched within **24–48 hours**. Average delivery times are:
* **USA & Canada:** 7–12 business days (Express options available)
* **Europe & UK:** 7–10 business days
* **Australia & Rest of World:** 8–14 business days
You will receive a tracking code via email as soon as your package leaves our facility.
**Q3: How is the boiler packaged to ensure it arrives safely without damage?**
**A:** Precision steam equipment requires maximum transit protection. Every RW-B2 is secured inside a high-density, custom-molded shockproof foam casing within a reinforced graphic carton. Sensitive components like the pressure gauge and glass sight tube are doubly protected against vibration, drops, and rough handling during international transit.
**Q4: What type of fuel should I use, and how long does a full tank run?**
**A:** The RW-B2 boiler is designed to run on standard **butane gas** (commonly used for model boilers or portable stoves). With a full 500mL water capacity and a properly adjusted flame, a single session typically yields **20 to 30 minutes of continuous run time**, depending on your engine's steam consumption and throttle settings.
**Q5: How do I fill water into the boiler, and what kind of water should I use?**
**A:** Always use **distilled or demineralized water** to prevent mineral scale build-up inside the copper tubes. Fill the boiler to approximately 70–80% of its total capacity (around 350–400mL), leaving enough headroom for steam to expand. You can monitor the precise level via the built-in sight glass.
> **Pro Tip:** Never dry-fire the boiler without water, as this will damage the silver-brazed seams and thermal insulation.
**Q6: How safe is this boiler to operate? What safety features are built in?**
**A:** Safety is our top priority. The RW-B2 operates safely between **2–4 kg/cm² (28–57 PSI)** and features **dual independent safety pop-off valves** set to automatically vent excess pressure at 4.5–5 kg/cm². Additionally, the live pressure gauge allows real-time pressure monitoring, and the hardwood jacket protects your hands from direct contact with hot copper.
**Q7: Will this boiler fit inside my specific RC boat hull?**
**A:** The RW-B2 has a compact footprint with a 90mm boiler body diameter, a 140mm height, and a 120mm chimney. It is engineered for **70cm to 150cm (27.5"–59") model boat hulls** (such as steam launches, tugboats, and riverboats) with sufficient deck height or chimney cutout clearance.
**Q8: How do I connect this boiler to my steam engine?**
**A:** The boiler features a standard **M7 × 0.75 threaded steam outlet**. It connects directly to Stirlingkit steam engines ([RW-V4](https://www.stirlingkit.com/products/rw-v4-miniature-4-cylinder-steam-engine-v4-engine-model-for-90-150cm-boat-models), [RW-V2](https://www.stirlingkit.com/products/rw-v2-mini-dual-cylinder-v2-reciprocating-steam-engine-precision-model-for-70-130cm-boats), and [RW-L2](https://www.stirlingkit.com/products/rw-l2-retro-precision-mini-reciprocating-inline-twin-cylinder-steam-engine-model)) using copper steam piping. If your engine uses a different thread size, standard thread adapters (M7 to M6 or 1/4"-40) can be used.
**Q9: What maintenance is required after each steam session?**
**A:** After each use and once the boiler has cooled down completely:
1. Drain all remaining water to prevent internal corrosion or stagnant residue.
2. Wipe down the hardwood jacket and copper body with a dry soft cloth.
3. Apply a drop of steam cylinder oil or light machine oil to the safety valve springs to keep them operating smoothly.
