Singema Wood Fired Hot Tub Coil Kit Model A1 | Must-have Basic DIY Heating Coil
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Offer Singema Model A1 Basic DIY Wood Fired Hot Tub Coil Kit | Food-Grade 304 Stainless Steel 8-Circle Thermosyphon Heater Storage Bag, Off-Grid No-Electricity Heating for All Outdoor Soaking Tubs
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Description
This core heating unit is manufactured by Singema, crafted from food-grade stainless steel with an optimized 8-circle spiral design and detachable extension tubes. It acts as a standalone wood-fired heating solution that DIY builders pair with stock tanks, wooden barrels, plastic soaking tubs, or custom outdoor vessels to create fully off-grid hot bath setups. It relies on natural thermosyphon gravity flow to circulate heated water back to your tub, with no moving mechanical parts for long-lasting low-maintenance outdoor use.
Product Information
| Item | Full Details for Singema Model A1 Coil Kit |
|---|---|
| Official Model Number | Wood Fired Hot Tub Coil Model A1 (Basic DIY Heater Coil Kit) |
| Manufacturer | Singema Co.,Ltd. |
| Brand | Singema |
| Primary Construction Material | Food-Grade 304 Stainless Steel, seamless tubing, rust & corrosion resistant |
| 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 |
| Parts included | 1 x coil |
| Operating Mechanism | Passive thermosyphon gravity circulation (no electric pump/wiring needed) |
| Installation Difficulty | Beginner-friendly full DIY assembly, only basic hand tools required |
| Compatibility | All standard outdoor tubs: wooden barrels, metal stock tanks, foldable plastic soaking tubs |
| Core Function | Heat tub water solely via burning firewood for off-grid hot soaking |
Product Features
- Food-grade 304 stainless steel construction: Safe for bathing water, anti-rust, withstands continuous high fire temperatures and outdoor rain/moisture
- Optimized 8-circle spiral coil layout: Larger heat transfer surface accelerates water heating and cuts firewood consumption
- Zero-power thermosyphon operation: Runs purely on wood fire + gravity, works completely off-grid without electricity or gas
- Simple DIY bolt-together assembly: No professional plumber or welder required; full user-friendly fitting design
- Complete matching storage bag included: Protects coil during seasonal storage, easy to transport for camping/travel
- Universal tub fit: Compatible with wooden barrels, metal stock tanks, foldable outdoor hot tubs, custom DIY soaking vessels
FAQ
Does the Singema Model A1 coil need electricity or a water pump to heat my hot tub?
No power or pump is required. This kit uses passive thermosyphon flow, hot water rises naturally back to your tub while cool water circulates into the coil from gravity alone. You only need dry firewood as fuel.
What size outdoor tub works best with the Model A1 coil?
It is designed for 500L–1200L standard uninsulated or insulated outdoor soaking tubs including wooden barrels, metal stock tanks, and foldable plastic tubs. Larger tubs will require longer heating sessions with steady firewood supply.
Is the stainless steel coil safe for human bathing water?
Yes, the tubing uses certified food-grade 304 stainless steel, which releases no toxic metals into hot water and resists rust even with regular outdoor exposure.
Can I take the Model A1 coil camping or store it through winter?
Absolutely. The detachable extension tubes break down compactly, and the included all-in-one storage bag protects the coil from dust, moisture, and damage during travel or off-season storage.
How long does it take to heat a full tub to comfortable soaking temperature (104°F / 40°C)?
A standard 800L uninsulated tub reaches bathing temperature in roughly 1.5–2 hours with steady dry hardwood burning. Insulated tubs heat 20–30% faster. For ways to speed up heating, see our tips for maximizing heating efficiency.
What maintenance does the Singema wood fired coil require long-term?
Minimal upkeep only. After each use, rinse the coil interior with fresh water to remove mineral buildup, and store fully dry inside the storage bag to prevent surface oxidation. No complex servicing is needed.
Usage Scenarios
- Off-grid rural cabin backyard soaking: For properties without grid electricity or natural gas lines, heat permanent backyard wooden barrel tubs with local firewood
- Camping & wilderness retreats: Portable coil + storage bag setup for temporary outdoor tubs at forest campsites, beach glamping, remote hiking lodges
- Backyard budget DIY hot tub builds: Home hobbyists converting low-cost stock tanks or plastic vessels into functional wood-fired hot baths
- Seasonal outdoor garden relaxation: Spring/fall cold weather soaking without expensive electric spa heating bills or propane tank refills
- Self-sustainable homestead off-grid bathing: Eco-friendly zero-fossil-fuel hot water solution for permanent off-grid homesteads focused on low utility reliance. Always review our safety guidelines before first use.
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Luigi (verified owner) –
Food-grade stainless steel makes a huge difference—water stays clean and seems very long service years in continue firing, unlike cheaper coils I’ve used before.
Singema –
It`s very nice of you to give us a so high evaluating.It`s our target to let every customer brought from Smartclima be satisfied.
Raegan (verified owner) –
Great value! The wood fired heater coil is perfect for relaxing evenings.