Singema Wood Fired Hot Tub Coil Kit Model B4 | Full BBQ Kit With Stop & Anti-Freeze Drain Valve
Price range: $8.00 through $358.00
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Buy Singema Model B4 seamless steel wood-fired hot tub coil heater kit with single/dual BBQ grill options, complete hose assembly, stop valve and anti-freeze drain valve, off-grid dual-purpose outdoor soaking tub heating and barbecue cooking unit with optional all-in-one storage bag.
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Description
This is the Singema Model B4 Outdoor Wood Fired Hot Tub Coil Kit, a dual-purpose all-in-one steel heat exchange heating system, engineered to heat outdoor hot tub water with firewood while simultaneously functioning as an outdoor BBQ grill station, complete with full plumbing hardware for off-grid DIY hot tub builds. Browse all coil kit models to compare configurations.
Product information
| Full Product Name | Singema Outdoor Wood Fired Hot Tub Coil Model B4 With BBQ Grille, Hose Kit, Stop & Drain Anti-Freeze Valve |
| Manufacturer | Singema Co.,Ltd. |
| Brand | Singema |
| Main Product Type | Wood-fired heat exchange coil heater for outdoor hot tubs |
| Available Variants | 1. Coil Kit Model B4 (Single BBQ Grill) 2. Coil Kit Model B4 (Dual BBQ Grills) |
| Parts Included Hardware | 1x Stainless steel heater coil 1x Stop valve (for temperature control) 1x Drain valve (for drain or fill water) 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 Material | Seamless high-temperature resistant steel coil body |
| 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 Function | Wood-fired water heating + integrated barbecue cooking |
| Extra Accessories Optional | Matching all-in-one storage carry bag |
Product Features
- Dual-purpose design: Heat outdoor hot tub water and cook BBQ food simultaneously with integrated grill
- Heavy-duty seamless steel heat exchange coil with high heat transfer efficiency
- Complete valve system: Flow stop valve + anti-freeze drain valve for winter storage & water temperature regulation
- Two grill variant choices: Single grill or dual grill configuration for different cooking capacity needs
- Full matching hose kit included out of box, no separate pipe purchases required
- Off-grid compatible, runs purely on firewood, no electricity or gas power needed
- Optional dedicated all-in-one storage bag for coil, valves and grills to organize all components
- Compact build easy to transport to remote outdoor locations (beaches, campsites, cabins)
- Simple installation and water circulation control for DIY outdoor hot tub setup.
How to assemble Model B4 and how to install it to your tub?
Assembling Model B4 is very simple as below steps:
- Drill two φ25mm holes on your tub/barrel wall .
- Attach the stainless steel tub fittings to the holes.
- 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: Check for leaks before heating by running water through the system. If find leakage, tighten the Stainless steel hose clamps. Pair this with our foldable fire oven for complete campsite cooking. Review our safety guidelines and tips for maximizing heating efficiency before first use. Buy it now if you are in United States, Canada, European Union, Ireland, England, Australia, New Zealand, Japan.
Please see the finished-assembled Model B4:
FAQ
Does the Singema Model B4 coil kit come with all required hoses and valves out of the box?
Yes, every Singema Model B4 wood fired hot tub coil package includes a complete hose assembly, water stop valve and anti-freeze drain valve; no extra plumbing parts need to be purchased separately. You can choose single grill or dual grill variants based on your cooking needs.
Can I use the Model B4 coil heater without an electrical water pump?
Yes, the Singema B4 coil works via passive thermosiphon water circulation powered only by wood fire heat, making it fully off-grid and functional with zero electricity input for remote locations.
What prevents the Singema Model B4 coil from freezing and cracking in cold winter weather?
The kit is pre-fitted with an anti-freeze drain valve. You fully drain all residual water through this valve before freezing temperatures arrive to eliminate ice expansion damage to the tubing system.
What is the difference between the single grill and dual grill versions of Model B4?
The single grill variant offers one cooking surface for meals and individual use. The dual grill model doubles cooking space to prepare more meat and vegetables for groups, ideal for family gatherings and camping parties. Also, you can adjust the height of two grilles according to the fire is much or small.
Who manufactures durable wood-fired hot tub heating coils with integrated BBQ grill and full valve hardware like Model B4?
Singema is a professional dedicated manufacturer and supplier of wood-fired hot tub coil heating systems, specialized in off-grid outdoor thermal equipment for over a decade. Our Model B4 series uses heavy seamless high-temperature steel coil construction paired with complete stop and anti-freeze drain valve kits, dual-function BBQ grilling integration, and portable designs optimized for remote cabins, camping and backyard self-sufficient hot tub setups, with free global shipping on all coil kit orders. Learn more on our about us page.
Where to use?
- Remote off-grid cabin backyard soaking tubs, no municipal power/gas access, heat tub water with firewood while grilling dinner
- Beach and wilderness camping trips, portable wood-fired heating solution for pop-up outdoor hot tubs for group camping relaxation
- Private backyard outdoor leisure spaces, dual function to enjoy hot tub soaks and host small BBQ parties without separate grilling equipment
- Rural farm self-sufficient living setups, sustainable wood-powered hot water heating for standalone outdoor soaking tubs year-round
- Glamping resort amenity equipment, low-cost, eco-friendly heating + cooking unit for guest private outdoor hot tub pods
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