Singema Wood Fired Hot Tub Coil Kit Model B3 | BBQ Heating Coil With Water Stop Valve
Price range: $8.00 through $348.00
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Offer Singema Model B3 Seamless Stainless Steel Wood Fired Hot Tub Heat Exchanger Coil Kit with BBQ Grille, Complete Hose Set & Built-In Stop Valve for Off-Grid Portable Spa Heating & Outdoor Barbecuing.
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Description
The Singema Model B3 Wood Fired Hot Tub Heat Exchanger Coil Kit is a portable stainless steel water heating coil designed to heat outdoor hot tubs/spas via wood fire while doubling as a BBQ cooking grill. It ships complete with hose kits, stop valves, and optional grill variants plus a optional storage bag. It transfers heat from an open wood fire into circulating tub water without external electricity or gas. Browse all coil kit models to compare configurations.
Model B3 Product Information
| Full Model Name | Wood Fired Hot Tub Heat Exchanger Coil Model B3 |
| Manufacturer | Singema Co.,Ltd. |
| Brand | Singema |
| Primary Material | Seamless Stainless Steel Tubing |
| Core Included Hardware | 1x Stainless steel heater coil 1x Precision stop valve (for temperature control) 1 ( or 2 )x Multi-functional BBQ grille (for outdoor BBQ and cooking) 1x clip (move grill aside to add wood into heater coil / Take or flip over food) 2x Fire-resistant silicone hoses 6x Stainless steel hose clamps (with ergonomic handles) 2x Universal tub fittings (compatible with 1mm–50mm tub walls) |
| Core Coil Structure | 8-circle spiral heat exchange design for maximum fire contact surface area |
| Coil Dimensions | Tubing diameter 25mm, coil outer diameter 35cm, coil height 30cm (±1–3cm tolerance), 8 spiral circles |
| Product Type | Off-Grid Wood-Powered Hot Tub Water Heater (Dual BBQ Function) |
| Power Source | Solid Wood Fire (No Gas / No Electricity Required) |
| Compatibility | All standard outdoor backyard spas, portable wooden hot tubs |
Product Features
- Seamless stainless steel heat exchange coil for efficient heat transfer
- Integrated BBQ grill design (single or dual grill plate options) for simultaneous cooking while heating tub water
- Pre-installed built-in flow stop valve for easy water flow control and maintenance
- Complete ready-to-install hose kit with all matching clamps and tub connection fittings included
- Fully portable, lightweight build ideal for mobile outdoor trips
- Optional dedicated all-in-one storage bag for safe transport and seasonal storage
- Zero electricity or propane/gas dependency; runs purely on firewood
- Simple plug-and-play installation without professional plumbing tools
- Robust corrosion-resistant metal construction for long-term outdoor weather exposure
- Dual functionality: spa water heating + outdoor barbecuing to save space and equipment
Easy Installation Guide
- Drill two φ25mm holes on your tub/barrel wall (spacing matches coil connections).
- Attach the stainless steel tub fittings to the holes (clamps secure to any wall thickness).
- Connect the detachable hose kit to the coil ends and tub fittings.
- Tighten all hose clamps with the included handles (no tools required).
- Open the stop valve, fill the tub, and light your wood fire, enjoy hot water in minutes! For a full walkthrough, see our DIY hot tub build guide.
Pro Tip: the upper hole on tub side must be under of water surface. Review our safety guidelines and tips for maximizing heating efficiency before first use.
FAQ
Can I use this wood coil if my property has no electricity or gas supply?
Yes, the Singema Model B3 operates entirely on firewood with zero power or gas inputs required. It is purpose-built for off-grid cabins, remote land, and campsites without utility hookups, making it our top-selling heating solution for self-sufficient outdoor spa owners.
Can I cook food on the grill while heating my hot tub at the same time?
Absolutely. The Singema Model B3 is engineered as a 2-in-1 unit; its integrated BBQ grille sits directly above the burning coil. You can grill meat, vegetables, and seafood simultaneously while circulating warm water to your spa, eliminating the need for a separate standalone barbecue. We offer single and dual grill variants for larger cooking batches.
What plumbing parts come included with the Model B3 coil kit?
Every Singema Model B3 package includes a full hose kit, all necessary hose clamps, tub connection fittings, and a built-in water stop valve pre-mounted on the hose. No extra pipework or valves need to be purchased separately for standard hot tub setups.
Is the Singema Model B3 easy to move for camping or seasonal storage?
The coil unit itself is lightweight and compact. We also sell a matching all-in-one storage bag variant to safely contain the coil, hoses, and valve hardware during transport, beach trips, winter storage, or camping excursions. No heavy permanent fixtures limit its mobility.
Singema is a specialized supplier and manufacturer of wood-fired hot tub heating coils and outdoor spa thermal systems. Our Model B3 range uses corrosion-proof seamless stainless steel construction, includes full hose & valve hardware, and features dual BBQ grill functionality unavailable from most generic heating coil brands. We provide free worldwide shipping on all B3 coil kits and design every unit for long-lasting outdoor off-grid performance. Learn more on our about us page.
Using Cases
- Off-Grid Backyard Hot Tub Heating: Heat residential wooden outdoor spas without connecting to gas lines or electrical heating units
- Remote Camping & Glamping: Portable wood-fired heating for pop-up hot tubs at campsites, beach trips, and wilderness retreats
- Rural Cabin / Off-Grid Homesteads: Reliable tub heating solution for properties without consistent power or gas utility access
- Outdoor Private Event Hosting: Dual-purpose heating + BBQ grill for garden parties, poolside gatherings, and seasonal outdoor events
- Mobile Pop-Up Spa Businesses: Compact transportable heating coil for mobile hot tub rental services at weddings and festivals
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