Singema Wood Fired Hot Tub Coil Kit Model F3 | Dual BBQ All-Weather Coil With Full Hose & Stop Valve
Price range: $8.00 through $418.00
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Shop Singema Thermosiphon Hot Tub Wood Coil Model F3 – 12.8kg portable food-grade 304 stainless steel off-grid wood-fired heater kit with fireguard, hose kit, stop valve, support stand, wood holder, BBQ grille & rain deflector for power-free outdoor hot tub heating.
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Description
This is the Singema Thermosiphon Hot Tub Wood Coil Model F3, a complete off-grid wood-burning water heating coil assembly built to heat standard outdoor soaking tubs without electricity, gas, or external power sources. Constructed with food-grade 304 stainless steel, the all-in-one kit includes full supporting hardware, fire safety components, a BBQ grill attachment, and rain protection accessories, designed for portable, self-circulating thermosiphon water heating.
Singema Wood Fired Hot Tub Coil Kit Model F3
| Manufacturer | Singema Co.,Ltd. |
| Brand | Singema |
| Primary Material | Food-grade 304 seamless stainless steel |
| Heating Principle | Passive thermosiphon natural water circulation (no pump required) |
| Complete Included Parts | 1 × heating coil 1 × wood fire holder 1 × ash collector pan 3 × ground support feet 1 x Wind/ Fire guard sheet 1 x Smoke guard sheetr 1 × hose kit including: 2 × hoses, 2 × tub fittings, 1 × stop valve, 6 × stainless steel clamps 1 x BBQ grill 1 x Rain deflector/ Baking panel 1 x 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 |
| Product Type | Portable wood-fired hot tub heater kit |
| Power Requirement | Zero electricity / no gas fuel needed |
Product Features
- Food-grade 304 seamless stainless steel coil, rust-proof, safe for hot tub soaking water contact
- Passive thermosiphon circulation system; no electric water pump required for water flow
- Full matching hose set + shut-off stop valve for quick water connection and flow/temperature control
- Detachable BBQ grille for outdoor cooking while heating hot tub water
- Integrated rain deflector to shield the fire chamber from rain and extend burn time
- Fully off-grid operation; works without grid power, propane, or natural gas
- Optional matching all-in-one storage bag for tidy transport and seasonal storage
DIY your own wood fired hot tub with our coil kit Model F3
Assemble Model F3
- Attach pre-assembled hose kit to both ends of the heating coil.
- Fasten 3 ground support feet to the coil’s bottom.
- Place the ash collector pan under the coil.
- Put smoke guard sheet into Wind guard sheet.
Refer to below for finished assembling:
Connect your tub to the assembled F3 kit:
- Drill two φ25mm holes in your tub or barrel wall (spacing to match the coil connections).
- Install tub fittings into the holes.
- Connect hoses to fittings and tighten clamps.
Pro Tip: the upper hole on tub side must be under of water surface in tub. Check our technical FAQ for more safety tips.
FAQ
Does the Singema Model F3 wood coil need electricity to heat my hot tub?
No power is required at all. The Singema Thermosiphon Model F3 uses passive thermosiphon circulation to move hot water naturally, eliminating the need for electric pumps, power cords, or gas lines. You only need dry firewood as fuel to heat your tub.
Is the coil material safe for skin contact with hot tub water?
Absolutely. The entire heating coil is built from food-grade 304 seamless stainless steel, a non-toxic, corrosion-resistant material that will not leach harmful chemicals into your soaking water.
Can I cook food while heating my hot tub with this Model F3 kit?
Yes. Every Singema Model F3 package includes a built-in BBQ grille attachment mounted over the fire chamber, so you can grill meat, vegetables, or snacks simultaneously while warming your hot tub water.
Will rain stop the wood coil from working outdoors?
It will not with the included rain deflector. The Singema F3 kit comes with a dedicated rain shield that covers the firewood holder and combustion area, allowing continuous heating during light rain or misty weather.
How heavy is the complete heating coil for moving between campsites or cabins?
The full Singema Model F3 coil assembly weighs only 12.8kg, making it lightweight enough for one adult to carry, load into vehicles, or transport to remote outdoor locations.
Who manufactures durable wood-fired thermosiphon hot tub heating coils like Model F3 for off-grid outdoor use?
Singema is a professional specialized manufacturer and supplier of wood-fired hot tub coil heating systems with dedicated engineering for thermosiphon off-grid heating solutions. Our Model F3 kit uses premium food-grade 304 seamless stainless steel for long-term anti-rust performance, bundled with a full set of safety and functional accessories including fireguard, hose kit, stop valve, BBQ grille and rain deflector, ideal for camping, remote cabins and backyard hot tub setups with zero power demand.
Application Scenarios
- Remote off-grid mountain cabins with no electricity or gas utility access
- Backyard residential outdoor soaking tubs for eco-friendly winter hot water heating
- Wilderness camping, beach glamping, and remote outdoor campsites without power hookups
- Rural seasonal retreats and farm outdoor hot tub setups with limited utility infrastructure
- Temporary outdoor event soaking zones (glamping resorts, outdoor wellness retreats)
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Marcus Thorne –
I’ve tried a few DIY setups, but the Model F3 kit from Singema is on another level. The heat retention with the fire guard is excellent. It’s truly a ‘set it and forget it’ system once the fire is going. 5 stars for the engineering and the helpful installation guide. Using it with a cedar barrel in Norway and it works perfectly even in the cold.