Editorial correction: This guide uses manufacturer documentation. ThermalFinn has not performed firsthand heater testing. Unsupported measurements, rankings and universal installation prescriptions from earlier versions have been removed.

Identify the Equipment Before Planning the Circuit

Use the exact heater item number, voltage version, controller and manufacturer’s wiring diagram. Product-family names and rated kW alone do not establish an installation specification. The earlier generic breaker and cable tables on this page have been withdrawn.

The Harvia PC90E product page identifies a North American 240 VAC single-phase version. The HUUM DROP product page offers regional electrical specifications and its user manual. Do not transfer a wiring table from another regional version to your purchase.

Prepare an Installation Packet

Give your electrician:

  • The exact heater and controller model numbers and current manuals.
  • A room plan showing dimensions, glazing, heater, benches and doors.
  • The intended locations of controls, sensors and other accessories.
  • The proposed equipment location and the route to the electrical panel.
  • Details of any existing sauna equipment being replaced.

Ask the installer to determine supply compatibility, panel capacity, circuit protection, conductors, routing and applicable permit or inspection requirements. Do not calculate spare panel capacity by subtracting a sum of breaker labels from the main breaker rating; the former instruction to do that was incorrect.

Follow Model-Specific Placement Instructions

Sensor and control placement must follow the selected equipment’s instructions. Avoid generic assumptions about where every controller can be mounted or what every sensor requires. Confirm remote-control accessories and safeguards with the manufacturer if remote operation is part of the package.

HUUM states that electrical installation and connection must be performed by a certified electrician under the applicable local requirements. This page is a preparation checklist, not a wiring procedure.

Before Ordering

Have the installer review the proposed equipment and include installation costs in the complete package comparison. Start with the heater comparison hub if the model has not yet been selected.

Manufacturer Sources

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