Wood Fired Hot Tub Heater - Aluminum 70,000 BTU

Both the stove body of the Water Heater and the firebox are made with high quality aluminum, making this wood burning hot tub heater easy to move. The heater can be left outside without the danger of rusting or burning-out. A specially designed vented smoke outlet provides secondary combustion of unburned gases, thereby reducing smoke emissions and chimney sparks. The heater comes with 10' of stainless-steel stove pipe and includes a top rain cap as well as an adjustable flue damper for fine control.

The Lightweight Champion of Off-Grid Heating

Experience the primal joy of a wood-fired soak without the hum of electric pumps or the shock of utility bills.

The TimberLine BonFire is a high-performance 100% Aluminum water stove designed for medium-to-large hot tubs. Producing a robust 70,000 BTUs (20kW), it harnesses the superior thermal conductivity of aluminum to transfer heat into your water faster than comparable steel models.

The Aluminum Advantage: Faster Heat, Less Weight

• Superior Conductivity: Aluminum conducts heat roughly 4x better than stainless steel. This means the fire's energy is absorbed instantly by the water jacket, reducing warm-up times.

• Ultra-Portable: Weighing only 66 lbs, the BonFire is easy for a single person to carry.3 It is the ideal choice for remote cabins, cottages, or difficult-to-access backyard installations.

• Rust Free: Aluminum naturally resists rust, ensuring years of outdoor service.

How It Works: "Thermosiphon" (No Pump Required)

This heater is truly electricity-free. It utilizes the laws of physics to circulate water.

1. Rise: As water inside the double-walled jacket heats up, it becomes lighter and naturally rises out of the top port into your tub.

2. Draw: This movement creates a vacuum that pulls cold water from the bottom of your tub into the heater.

3. The Result: A completely silent, continuous loop of heating that requires zero pumps, zero noise, and zero electricity.

Engineered for Efficiency

• Double-Wall Water Jacket: The firebox is surrounded by a 1.5-inch layer of water, capturing heat from all sides.

• Baffle Tube Technology: Water-filled tubes run horizontally through the flames. This forces the fire to travel around them (secondary combustion), squeezing every last drop of heat from your wood before smoke exits the chimney.