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Ignis-V35 External Wood-Fired Hot Tub Heater – 35kW Marine Aluminium
Ignis-V35 External Wood-Fired Hot Tub Heater – 35kW Marine Aluminium
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The Ignis-V35 is a 35kW external wood-fired hot tub heater built from high-quality, seawater-resistant marine aluminium. Designed for hot tubs up to 170 cm in diameter, it sits outside the tub and heats the water via the natural thermosiphon principle — cold water flows in through the lower pipe, heated water returns to the tub through the upper pipe, with no pump or electricity required.
Marine aluminium conducts heat approximately 15× more efficiently than stainless steel, making this heater up to 30% more effective. The 3 mm thick shell is twice the thickness of standard stainless steel units, yet 30% lighter — and aluminium holds its shape over time, where thin stainless steel can warp with prolonged use. Every weld is completed using high-quality MIG technique and individually tested for impermeability before dispatch.
All prices are fully inclusive of VAT, UK customs fees, import duties, and shipping to the UK mainland. No hidden charges at checkout.
- Ignis-V35 external hot tub heater – 35kW, seawater-resistant marine aluminium
- Stainless steel chimney – 2 m (two-part)
- Ash grill
- Door
- Drain plug
- 50 mm aluminium connection pipes – 2 pcs
- Rubber connection hoses (200 mm) – 2 pcs
- Pipe clamps – 4 pcs
- Model: Ignis-V35
- Type: Wood-fired (external)
- Power output: 35 kW
- Material: Marine aluminium (seawater resistant), 3 mm thick
- Suitable for: Hot tubs up to 170 cm diameter
- Width: 360 mm
- Height: 660 mm
- Length: 560 mm
- Weight: 37 kg
- Chimney: 2,000 mm stainless steel, two-part
- Connection pipe diameter: 50 mm
- Never start heating before the hot tub is filled with water. The connection pipes must be submerged before lighting. Operating dry will permanently damage the unit.
- When temperatures reach -1°C or below, drain the heater fully using the drainage tap on the underside to prevent frost damage.
- Chlorine is not recommended with aluminium heaters. Verify any other pool chemicals are safe for marine aluminium before use.
Estimated delivery across the UK and Europe within 5 days. All prices are fully inclusive of VAT, customs fees, import duties, and UK mainland shipping.