1. Quick Reference Electrical Specification Matrix

All ratings apply to North American single-phase residential electrical service (240V, 2-wire + equipment ground).

Table 1: 240V Single-Phase Specifications

\Note on HL80E: NEC 125% continuous duty rule requires 50A breaker in strict inspection jurisdictions. \\Note on Combi Interlock: The Xenio Combi control interlocks the heating elements and steamer tank so they do not energize full heating load simultaneously, maintaining 50A maximum service.*

2. Critical Electrician Directives & Code Mandates

A. Supply Conductor Standards & Conduit Entry

• Conductor Material: Copper conductors only, rated minimum 90°C (194°F) (THHN/THWN).
• Conduit Rough-In: Terminate wiring using flexible metallic or liquid-tight conduit through the bottom knockout on the side of the heater base.
• Neutral Conductor: No neutral wire is connected to the standard Virta heater. For the Virta Combi, the steamer boiler and automated water refill solenoid connect to the Xenio Combi contactor unit per the manufacturer schematic.

B. GFCI Breaker Policy

• Manufacturer Recommendation: Connect to a dedicated standard 2-pole thermal-magnetic breaker without GFCI. Standard Class A GFCI breakers (4–6 mA) are prone to nuisance tripping during startup due to minor atmospheric moisture absorption in the heating elements, which evaporates within 1 hour of heating.

3. Clearances & Spatial Layout (Safety Distances)

Table 2: Minimum Safety Clearances to Combustibles

                      SAUNA CEILING (Min Height: 75.0 in / 1900 mm)
      =============================================================================
             ^                                                             ^
             | Min. 43.3 in (1100 mm)                                      |
             | Clearance Above Stone Rim                                   |
             v                                                             |
      +---------------+                                                    |
      | ############# | <--- Sauna Stones (120-160 lbs)                    |
      | ############# |                                                    |
      |   HARVIA      |                                                    |
      |    VIRTA      | <--- Front Maintenance Hatch                       |
      |   (6-10.5kW)  |      (Terminal access without removing stones)     |
      |               |                                                    |
      +---------------+                                                    |
        | |       | |                                                      |
        +-+       +-+ <--- Adjustable Leveling Feet (Floor Mount)          |
      =====================================================================+
             | <--- Side Wall Clearance: Min. 4.0 in (HL60-90) / 6.0 in (HL110)
             | <--- Front Guard Clearance: Min. 4.0 in (HL60-90) / 6.0 in (HL110)

4. Floor Mounting & Sauna Kit Timber Construction

The loaded operating weight of the Virta with 120–160 lbs of stones is ~170 to 230 lbs (77–104 kg).

A. Pre-Fabricated Solid Timber Sauna Kits (Dundalk Leisurecraft & SaunaLife)

B. Bench Embedding Cutouts

• If recessing the Virta into lower benches, maintain the 4.0-inch (or 6.0-inch) perimeter clearance and install the official Harvia Virta Embedding Flange (Black).

5. Control System Architecture (Xenio CX170 vs Xenio Combi CX170C)

• Virta Standard (HL60E/HL80E/HL90E/HL110E): Operated via the Harvia Xenio CX170 power unit, ceiling temperature sensor, and digital touch panel.
• Virta Combi (HL80SA/HL90SA/HL110SA): Operated via the Harvia Xenio Combi CX170C power unit, which features dual sensor inputs:
• Ceiling temperature sensor with thermal safety fuse.
• Relative humidity sensor to monitor and automate steam output.

  [Main Distribution Panel (240V 1-Phase)]
     Dedicated 2-Pole Circuit Breaker (30A / 40A / 50A)
                |
                v (240V Line In: L1, L2 + Equipment Ground, 90°C Copper)
  [Harvia Xenio CX170 / CX170C Power Unit] <==== (Low-Voltage Sensor Line) ====> [Ceiling Temp Sensor w/ Fuse]
                |                                                                  (Directly above heater on ceiling)
                |                                                                  (Combi adds RH% Sensor)
                +==== (Data Cable) ====> [Xenio Touch Control Panel]
                |                        (Exterior surface mount)
                v (Load Out: Terminals U, V, W + Ground)
  [Virta Terminal Compartment (Front Access)]
   - Terminal U / V / W: Heating Element Banks
   - Steamer Interlock (Combi): Automated Tank Relay
   - Ground Lug: Equipment Grounding Conductor

6. Sizing Formula & Sauna Kit Verification

• Formula: Room Volume (cu. ft.) + (3.3 cu. ft. × Sq. Ft. Uninsulated Glass/Tile).
• Kit Compatibility:
• Virta 6kW (177–294 cu. ft.): 4-person indoor saunas or 6'×6' outdoor barrels.
• Virta 8kW / 9kW (177–494 cu. ft.): Sized for 6-person barrels (Tranquility, Serenity) and cabin saunas (Georgian Cabin).
• Virta 10.5kW (354–636 cu. ft.): Large outdoor cabin saunas and high-volume commercial installations.

8. Official Manual Audit & Compliance Verification