1. Quick Reference Electrical Specification Matrix

The Harvia Virta Pro is engineered for heavy commercial health clubs, hotels, and luxury wellness facilities.

Table 1A: 208V 3-Phase Specifications (Standard Commercial 3PH)

Calculated Phase Amps: I = P / (V × √3). Source: Harvia Virta Pro Technical Manual.

Table 1B: 240V Single-Phase Specifications (Dual-Feed Configuration)

When connecting Virta Pro to high-amperage 240V single-phase commercial/residential services, the element banks are split across dual branch circuits:

• HL135 (13.5 kW @ 240V = 56.3 A): Dual 40A + 40A 2-Pole Breakers with dual 8 AWG + 8 AWG copper runs.
• HL160 (16.0 kW @ 240V = 66.7 A): Dual 50A + 40A 2-Pole Breakers with 6 AWG + 8 AWG copper runs.
• HL210 (21.0 kW @ 240V = 87.5 A): Dual 60A + 60A 2-Pole Breakers with dual 6 AWG + 6 AWG copper runs.

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 knockout located on the lower electrical service base.
• Neutral Conductor: No neutral wire is connected to the heater element terminals.

B. GFCI Breaker Policy

• Manufacturer Recommendation: Connect to a dedicated standard 3-pole (or dual 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 large stone/element bank, which evaporates within 1 hour of heating.

3. Clearances & Spatial Layout (Safety Distances)

Table 2: Minimum Safety Clearances to Combustibles

                 COMMERCIAL CEILING (Min Height: 82.7 in / 2100 mm)
      =============================================================================
             ^                                                             ^
             | Min. 43.3 in (1100 mm)                                      |
             | Clearance Above Stone Rim                                   |
             v                                                             |
      +---------------+                                                    |
      | ############# | <--- Massive Stone Compartment (220-240 lbs)       |
      | ############# |                                                    |
      |  HARVIA VIRTA |                                                    |
      |      PRO      | <--- Independent Front Service Maintenance Door    |
      | (13.5-21.0kW) |      (Access element terminals without unloading)  |
      |               |                                                    |
      +---------------+                                                    |
        | |       | |                                                      |
        +-+       +-+ <--- Heavy-Duty Leveling Legs (350 lb static load)   |
      =====================================================================+
             | <--- Side Wall Clearance: Min. 6.0 in (HL135/160) / 7.9 in (HL210)
             | <--- Front Guard Clearance: Min. 6.0 in (HL135/160) / 7.9 in (HL210)

4. Floor Mounting & Commercial Structural Backing

The loaded operating weight of the Virta Pro with 220–240 lbs of stones is ~320 to 345 lbs (145–156 kg).

• Heavy-Duty Commercial Frame: Stands on 4 heavy-duty adjustable leveling legs. The floor structure (tile on concrete or heavy timber subfloor) must support a static load of 350 lbs.
• Front Access Maintenance Hatch: Like the residential Virta, the Virta Pro has an independent front service door allowing replacement of elements and terminal inspection without unloading the 220+ lbs of stones.

5. Control System Architecture (Harvia Xenio CX45 Commercial)

The Virta Pro is operated by the Harvia Xenio CX45 Commercial Contactor Unit.

 [Commercial Main Power Distribution Panel]
    208V 3-Pole Breaker (50A, 60A, or 80A)
               |
               v (Line In: Phase A, Phase B, Phase C + Ground)
 [Harvia Xenio CX45 Commercial Power Unit] <==== (Low-Voltage Sensor Wire) ====> [Temperature Sensor w/ Thermal Fuse]
               |                                                                   (Over heater ceiling per manual)
               |
               +==== (Data Cable) ====> [Xenio Touchscreen Control Panel]
               |                        (Mounted outside sauna room)
               v (Load Out: Terminals U, V, W + Ground)
 [Harvia Virta Pro Terminal Chamber]
  - Terminal U: Line 1
  - Terminal V: Line 2
  - Terminal W: Line 3
  - Ground Lug: Equipment Grounding Conductor

 [240V Single-Phase Dual-Feed Supply Architecture]
    Branch Circuit 1: 2-Pole Breaker (40A / 50A / 60A) ====> Runs to Xenio Contactor Bank 1 (Element Group A)
    Branch Circuit 2: 2-Pole Breaker (40A / 40A / 60A) ====> Runs to Xenio Contactor Bank 2 (Element Group B)
               |
               v (Common Enclosure Disconnect / Tie-Bar)
    [Harvia Virta Pro Dual Terminal Bus]
     - Bank 1 (L1A, L2A + Ground Lug 1)
     - Bank 2 (L1B, L2B + Ground Lug 2)

6. Sizing Formula & Commercial Room Applications

• Formula: Room Volume (cu. ft.) + (3.3 cu. ft. × Sq. Ft. Uninsulated Glass/Tile).
• Commercial Applications:
• Virta Pro HL135 (388–706 cu. ft.): Large boutique hotel saunas, gym suites (8–12 persons).
• Virta Pro HL160 (600–1,059 cu. ft.): High-traffic fitness clubs, Nordic spa thermal suites (12–16 persons).
• Virta Pro HL210 (777–1,412 cu. ft.): Massive commercial community saunas (up to 1,400 cu. ft.) requiring heavy continuous steam output and rapid thermal replenishment during frequent door openings.

8. Official Manual Audit & Compliance Verification