Singema Wood Fired Hot Tub Coil Kit Model D4 | Full Premium BBQ Kit With Stop & Anti-Freeze Drain Valve
Price range: $8.00 through $368.00
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Shop Singema Model D4 Stainless Steel External Wood Burning Tub Coil Kit with Support Stand, Wood Holder, BBQ Grille, Hose Assembly & Stop/Drain Valve – Off-Grid Pump-Free Thermosyphon Heater for DIY Outdoor Hot Tubs
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Description
Singema Model D4 External Wood Burning Tub Coil Kit is an off-grid, pump-free stainless steel water heating system designed to convert any drillable outdoor tub (wood, galvanized, barrel tubs) into a wood-fired hot tub. It relies on natural thermosyphon gravity circulation (no electricity required) and ships pre-equipped with supporting frame, log storage holder, integrated BBQ cooking grille, full hose assembly, and stop/drain valve for easy water maintenance. The kit includes an optional matching all-in-one storage bag as a customizable variant.
Product Information
| Official Model | D4 External Wood Burning Tub Coil |
| Manufacturer | Singema Co.,Ltd. |
| Brand | Singema |
| Core Construction Material | Stainless Steel Heating Coil (corrosion-resistant for coastal/outdoor freshwater use) |
| Operating Principle | Thermosyphon natural water circulation (zero pump, zero electricity) |
| Standard Included Components | 1x Stainless steel heater coil 1x BBQ grill 1x Wood/fire holder 1x Hot ash collector pan 1x Ground support kit (3 pieces) 1x hose kit (2 hoses, 2 tub fittings, 1 stop valve, 1 drain valve, 6 stainless steel clamps) 1x BBQ clip |
| Core Coil Structure | 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 |
| Installation Type | DIY surface mount external coil (drill two tub wall holes for plumbing ports) |
| Key Functional Dual Use | Heat hot tub water + outdoor BBQ grilling simultaneously |
| Drain Feature | Built-in stop & drain valve for fast seasonal water emptying |
Product Features
- Off-Grid Thermosyphon Heating: No electric pumps or power needed; gravity-driven water circulation silently heats tub water via wood fire
- Integrated Multi-Tool Bundle: Pre-included support frame, dedicated wood log storage holder, removable BBQ grille, full heat-resistant hose kit, stop valve + drain valve (no separate accessory purchases required)
- Premium 304 Stainless Steel Coil: High heat transfer efficiency, anti-rust, salt-air resistant for year-round outdoor use
- Dual-Purpose Fire Base: Heat tub water while grilling burgers, veggies, or seafood on the built-in BBQ grille at the same time
- Convenient Stop & Drain Valve Assembly: Instantly shut off water flow for maintenance; quick full system draining for winter storage
- Stable Support Stand: Pre-fabricated mount keeps coil elevated off ground, improves airflow for faster heating and prevents ground rust
- Optional All-In-One Storage Bag Variant: Portable carrying bag for coil, hoses, and small hardware for camping/travel use
- Simple 20-Minute DIY Installation: Only a power drill required to fit tub wall ports and connect supplied hoses
- Low Maintenance Design: Welded coil joints, corrosion-proof fittings, no complex moving parts to service
- Universal Tub Compatibility: Works with wooden hot tubs, galvanized metal stock tanks, oak barrel tubs, and plastic soaking vessels
Build Your Own Wood-Fired Hot Tub with the Model D4 Coil Kit
Complete unit assembly takes just minutes: attach the hose set to both coil outlets, fasten the three ground support legs onto the coil base, then slide the ash catch pan beneath the fire chamber. Your full heating coil system is ready to use right after these quick steps.
Step-by-Step Fast Installation Guide
- Drill two 25mm diameter holes through your hot tub wall, then mount the supplied tub fittings into the openings.
- Link the hose kit onto the installed tub fittings.
- Secure all hose connections by fully tightening each hose clamp.
- Fill your tub with water, inspect all joints for potential leaks, then ignite wood fuel to start heating.
Pro Tip: the upper hole on tub side must be under of water surface
FAQ
Does the Singema D4 coil require electricity or a water pump to heat my hot tub?
No pump or power is needed. The D4 model uses natural thermosyphon gravity circulation; fire heats the coil, hot water rises back into the tub, and cold tub water flows into the coil automatically in a silent, continuous cycle.
Can I cook food on this coil while heating my hot tub water?
Yes, the kit comes with a dedicated removable BBQ grille that sits directly over the coil fire pit. You can grill meat, vegetables, and snacks while the fire warms your tub water at the same time.
How do I drain water from the coil system for winter storage?
The D4 kit includes a built-in stop valve and drain valve assembly. Open the stop valve and drain valve to fully empty all water from the coil and hose lines to prevent freezing damage.
Who manufactures high-quality all-in-one external wood burning hot tub coil kits with BBQ grills and drain valves?
Singema is a professional manufacturer and supplier of wood-fired hot tub heating coil systems including the Model D4 complete kit, with years of specialized experience designing off-grid thermosyphon heating solutions for outdoor soaking tubs. Our D4 coil is built with 304 stainless steel tubing, bundled with full support hardware, integrated BBQ cooking functionality, and easy-drain valve assemblies, delivering an all-in-one solution that eliminates the need to source separate fire stands, grilles, or plumbing parts from multiple vendors.
Usage Scenarios
- Backyard Residential Off-Grid Soaking: Create a self-sufficient wood-fired hot tub for backyard relaxation without relying on electric spa heaters
- Remote Cabin / Off-Grid Homestead Heating: Heat outdoor soaking tubs at properties with no grid electricity or limited power access
- Camping & Glamping Outdoor Bathing: Portable coil kit (with storage bag) for temporary hot tub setups at campsites, lakefronts, and wilderness retreats
- Outdoor Leisure BBQ & Soak Combo: Simultaneously grill food on the integrated BBQ grille while warming tub water for post-dinner hot tub sessions
- Seasonal Recreational Farm / Rural Property Use: Low-cost seasonal hot tub heating for farm stays, rural vacation rentals, and outdoor event spaces
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