Hekla Indoor Traditional 210X Sauna — 4-5 Person Indoor Sauna

Hekla Indoor Traditional 210X — Real Finnish Sauna, 4-5 Person

The 210X is the wider sibling of the Traditional 210 — same height and width but 40cm deeper, opening up the floor plan for 4-5 people instead of 3-4. The extra room makes a real difference for shared sessions: more bench length, more stretching space, easier to lie down. Same Hekla build quality, same UK manufacturer, same proper Finnish sauna ritual — just sized for family use.

Built around a Harvia "The Wall" 9kW heater with stones included — the bigger heater needed for the larger volume — and 48mm thermo aspen walls that give Hekla its quality signature.

Running cost + warm-up

The Harvia 9kW heater pulls about 9 kWh peak — bigger sauna, bigger heater. Run cost at 30p/kWh is typically £2.50–£3.25 per 90-minute session. Warm-up from cold to working temperature (80–90°C) takes around 30–40 minutes. Once warmed, the larger 8.8m³ volume holds heat for longer between löyly throws — practical for sessions with more people getting in and out.

Why the 210X over the 210

• 40cm deeper interior — 2,000mm vs 1,600mm. That's enough for a proper full-length recline.
• 4-5 person capacity — fits couples + kids, or four adults for shared sessions.
• Harvia 9kW heater instead of 6kW — heat recovery between sessions is faster, important for multi-person use.
• 40-amp electrical supply — slightly more demanding than the 25-amp 210, but standard for sauna sizing.

What makes Hekla Traditional different

• 48mm thermo aspen wood walls — aspen has the lowest thermal conductivity of any common sauna wood, so benches stay comfortable even at 90°C. Thermo treatment (heat + steam, no chemicals) stabilises the wood and makes it more durable.
• 8mm grey safety glass on the door and window — proper safety spec, tempered for thermal shock.
• Harvia "The Wall" 9kW heater with Xenio digital control — Harvia is the named gold standard in every Finnish sauna review. Stones included.
• Chromotherapy LED lights + bluetooth sound system built in.
• Built-in non-slip vinyl floor grid.
• Choice of two finishes — Nero (dark, modern) or Scandi (lighter wood tone).

What's included

Cabin (48mm thermo aspen), 8mm grey safety glass door + window, Harvia "The Wall" 9kW electric heater, Harvia stones, Xenio digital control unit, chromotherapy LED lights, bluetooth audio, ventilation valve, non-slip vinyl floor grid, instructions. Comes with UK warranty.

Delivery & site preparation

• Standard delivery: Free standard UK delivery is included.
• Site: Indoor saunas need a level floor with clear access from front door to final placement room. The 210X needs more floor space than the 210 — measure 2,100 × 2,000mm plus working clearance.
• Electrical: The Harvia 9kW heater needs a dedicated 40-amp single-phase circuit connected by a qualified electrician before first use.
• Ventilation: Sauna ventilation valve included; ambient room ventilation (extractor) needs consideration for humidity management.
• Installation: Cabin assembly available — typically a full day for a 2-person team.

Specifications

• Capacity: 4-5 person
• Use: Indoor only
• Dimensions (W × D × H): 2,100 × 2,000 × 2,100 mm
• Sauna volume: 8.8 m³
• Wall thickness: 48mm thermo aspen wood
• Door + window: 8mm grey safety glass
• Heater: Harvia "The Wall" 9kW electric, Xenio control, stones included
• Power supply: 40A dedicated single-phase circuit
• Lighting: Chromotherapy LED
• Audio: Built-in bluetooth sound system
• Colour options: Nero or Scandi
• Warranty: Comes with UK warranty
• Brand: Hekla (Superior Wellness, UK)

💡 UK Sauna Buying Guide | Infrared vs Traditional comparison

Want a smaller indoor traditional? See the 210 (3-4 person). Want a larger one? See the 220 (6 person). Outdoor instead? See Outdoor Barrel or Outdoor Cube Saunas.