OTG Wood Fired Coil Kit
The original Sasquatch coil; full steel, proven heat, built for off-grid soaking.
Have your own tub and want to turn it into a hot tub for less? Or warm up a pool while enjoying a real fire? This kit is for you.
Our stainless steel coil kit includes everything needed to convert your tub into a durable, wood-fired hot tub;perfect for backyard setups, camping, or on-the-go DIY tubs. No electricity. No pumps. No gas. Just fire, water, and efficient design.
Built from food-grade stainless steel, the coil resists corrosion, salt, acid, and alkali, making it ideal for outdoor use. Its engineered curvature promotes smooth natural circulation for faster, more efficient heating.
Easy Setup
Drill two holes in your tub
Push-on and quick-fit stainless connections install in seconds
Newly upgraded high-heat, high-pressure hoses hold their shape over long runs and tight bends
You can do it.
Fire-Powered, Old-School Reliable
This is a non-electric hot tub system, powered only by firewood.
No wires. No engines. No pumps. No gas. No chemicals. No worries.
Just a bonfire and a better soak.
What’s Included
Stainless steel heating coil
Upgraded high-heat, high-pressure black hoses for improved durability and heat resistance.
Push-on coil connections
Stainless quick-fit connections to tub bulkheads
Thermometer
And good times
Note: This model does not include leg stands to keep the price down and the vibe up. Performance is unchanged, simply set it on bricks, rocks, or whatever you’ve got around the fire.
Best Use
Smaller tubs (~100 gallons)
Lightweight, compact, travel-friendly
Use 3 layers of insulation in cold or freezing conditions
Optional Add-Ons
Grill kit for cooking while your tub heats
Carrying bag to keep everything organized and easy to transport
Heat-Up Times (to ~40°C / 104°F)
Heating time depends on:
Water volume & starting temperature
Insulation quality (tub and coils)
Firewood quality (dense wood works best)
Examples:
~100-gallon tub, ~20°C water: ~60 minutes with light insulation
170-gallon tub:
0–15°C water: ~2.5–3+ hours
15–25°C water: ~90+ minutes
With proper insulation around the coils (heat reflectors, bricks, rocks, fire-safe metal deflector) and under/over the tub (wood blocks, thermal wrap, foam, plywood covers), heat-up times improve significantly.
General estimate: 60 minutes to 8 hours depending on tub size and conditions.
Smaller tubs heat fastest; larger tubs may benefit from running two coil kits side-by-side. Our 100-gallon tub is among the fastest-heating options available due to its low water volume and portability.
Extra Tip
Boiling water in a pot and adding it to the tub can reduce heating time by ~30%. Using the stainless BBQ/steaming grill while heating can also speed things up, and feed you at the same time.
Relax
And the process 🔥🦧🌲
SAFETY INFORMATION
Exercise extra caution when using your heater coil in settings where children or animals might be present. Safety should always be the top priority.
It is recommended to perform a quick and practical safety check of the setup before igniting the coil. Ensure that the coil is positioned away from any walkways and flammable materials, among other precautions.
Be aware that your cold water inlet and hot water outlet feeds must remain submerged beneath the water level in your hot tub at all times while the coil is in operation. If the water level in your tub drops below the point where warm water is discharged from your coil, or if it falls below this level while you are using the tub, water flow through the coil will cease and just sit in the coil, leading to a dangerous situation known as 'dry firing' the coil. This can result in the release of scalding hot water or steam from the hot water outlet. This is easily avoided by ensuring the top hot water outlet is always submerged beneath water.
Additionally, ensure that legs and body parts are kept at a safe distance from the hot water outflow pathway and it does not become blocked at any time.
Ensure the top hot water outlet is ALWAYS SUBMERGED IN WATER
*Heads up for international customers; your country may charge import taxes, duties, or brokerage fees on delivery. Those costs are out of our control and are the buyer’s responsibility.
The original Sasquatch coil; full steel, proven heat, built for off-grid soaking.
Have your own tub and want to turn it into a hot tub for less? Or warm up a pool while enjoying a real fire? This kit is for you.
Our stainless steel coil kit includes everything needed to convert your tub into a durable, wood-fired hot tub;perfect for backyard setups, camping, or on-the-go DIY tubs. No electricity. No pumps. No gas. Just fire, water, and efficient design.
Built from food-grade stainless steel, the coil resists corrosion, salt, acid, and alkali, making it ideal for outdoor use. Its engineered curvature promotes smooth natural circulation for faster, more efficient heating.
Easy Setup
Drill two holes in your tub
Push-on and quick-fit stainless connections install in seconds
Newly upgraded high-heat, high-pressure hoses hold their shape over long runs and tight bends
You can do it.
Fire-Powered, Old-School Reliable
This is a non-electric hot tub system, powered only by firewood.
No wires. No engines. No pumps. No gas. No chemicals. No worries.
Just a bonfire and a better soak.
What’s Included
Stainless steel heating coil
Upgraded high-heat, high-pressure black hoses for improved durability and heat resistance.
Push-on coil connections
Stainless quick-fit connections to tub bulkheads
Thermometer
And good times
Note: This model does not include leg stands to keep the price down and the vibe up. Performance is unchanged, simply set it on bricks, rocks, or whatever you’ve got around the fire.
Best Use
Smaller tubs (~100 gallons)
Lightweight, compact, travel-friendly
Use 3 layers of insulation in cold or freezing conditions
Optional Add-Ons
Grill kit for cooking while your tub heats
Carrying bag to keep everything organized and easy to transport
Heat-Up Times (to ~40°C / 104°F)
Heating time depends on:
Water volume & starting temperature
Insulation quality (tub and coils)
Firewood quality (dense wood works best)
Examples:
~100-gallon tub, ~20°C water: ~60 minutes with light insulation
170-gallon tub:
0–15°C water: ~2.5–3+ hours
15–25°C water: ~90+ minutes
With proper insulation around the coils (heat reflectors, bricks, rocks, fire-safe metal deflector) and under/over the tub (wood blocks, thermal wrap, foam, plywood covers), heat-up times improve significantly.
General estimate: 60 minutes to 8 hours depending on tub size and conditions.
Smaller tubs heat fastest; larger tubs may benefit from running two coil kits side-by-side. Our 100-gallon tub is among the fastest-heating options available due to its low water volume and portability.
Extra Tip
Boiling water in a pot and adding it to the tub can reduce heating time by ~30%. Using the stainless BBQ/steaming grill while heating can also speed things up, and feed you at the same time.
Relax
And the process 🔥🦧🌲
SAFETY INFORMATION
Exercise extra caution when using your heater coil in settings where children or animals might be present. Safety should always be the top priority.
It is recommended to perform a quick and practical safety check of the setup before igniting the coil. Ensure that the coil is positioned away from any walkways and flammable materials, among other precautions.
Be aware that your cold water inlet and hot water outlet feeds must remain submerged beneath the water level in your hot tub at all times while the coil is in operation. If the water level in your tub drops below the point where warm water is discharged from your coil, or if it falls below this level while you are using the tub, water flow through the coil will cease and just sit in the coil, leading to a dangerous situation known as 'dry firing' the coil. This can result in the release of scalding hot water or steam from the hot water outlet. This is easily avoided by ensuring the top hot water outlet is always submerged beneath water.
Additionally, ensure that legs and body parts are kept at a safe distance from the hot water outflow pathway and it does not become blocked at any time.
Ensure the top hot water outlet is ALWAYS SUBMERGED IN WATER
*Heads up for international customers; your country may charge import taxes, duties, or brokerage fees on delivery. Those costs are out of our control and are the buyer’s responsibility.