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Every hybrid sauna Topture carries. Exterior dimensions.
| Model | Interior / Exterior | Electrical | Dimensions | Seats | From |
|---|---|---|---|---|---|
| Finnmark FD-4 Trinity | Canadian Cedar / Thermo-Aspen | 120V 15A plug for infrared; dedicated 20A for the Harvia stove | 48″ × 48″ × 83″ | 2 | $7,795 |
| Finnmark FD-5 Trinity XL | Canadian Cedar / Thermo-Aspen | Dedicated 240V 20A circuit | 75″ × 64″ × 83″ | 4 | $8,995 |
The practical difference is the electrical supply. On the FD-4 Trinity the infrared and red-light side runs from a standard 120V 15-amp plug, while the Harvia Vega stove needs its own dedicated 20-amp circuit. The FD-5 Trinity XL runs everything from a single dedicated 240V 20-amp circuit. Both require a licensed electrician for the heater connection. Always consult a licensed electrician — requirements vary by local code and jurisdiction.
A hybrid sauna carries two independent heat systems in one cabin: infrared panels that warm your body directly, and a traditional electric heater topped with stones that heats the air and takes water for löyly.
They are genuinely separate systems with separate controls and, on the FD-4, separate electrical supplies. Check the model’s operating instructions for how Finnmark intends the modes to be used together.
That independence is the point. A hybrid gives you a 120–140°F radiant session on a weeknight and a 170–190°F stone session with steam at the weekend, without owning two saunas.
A hybrid sauna makes sense in three situations, and it is an expensive way to solve a problem you may not have.
If you already know which heat you want, buy the specialist. Topture’s infrared saunas and traditional saunas both start well below hybrid pricing, and a dedicated cabin does its one job better than a compromise.
Installation cost on a hybrid sauna is set by the traditional heater, not the infrared panels. The panels are the easy half.
On the Finnmark FD-4 Trinity the infrared panels and red light run from a standard 120V 15-amp plug, but the Harvia Vega stove still needs a dedicated 20-amp circuit installed by a licensed electrician. The FD-5 Trinity XL needs a single dedicated 240V 20-amp circuit. Either way the electrical work is a separate line in the budget from the sauna price.
For the checks your electrician will want, read Topture’s sauna electrical requirements guide.
Both hybrid saunas Topture carries are built for indoor installation — a basement, spare room, home gym or large bathroom. Neither is weatherised for outdoor use.
The FD-4 needs a 48″ × 48″ floor area and the FD-5 needs 75″ × 64″. Both stand 83″ tall, so a standard 8-foot ceiling clears them, though a finished basement at 84″ leaves almost no margin.
For the full room-fit checklist, see 2 person indoor saunas. If the sauna needs to live outside, hybrids are not the category — compare outdoor saunas instead.
Topture’s hybrid range splits by capacity, though at present each size holds a single Finnmark model. The FD-4 Trinity is the two-person option and the FD-5 Trinity XL is the four-person.
Both hybrid cabins also appear in Topture’s indoor hybrid saunas collection, since neither is built for outdoor installation.
Topture carries hybrids alongside dedicated infrared and traditional cabins, which means the team can tell you when a hybrid is the wrong purchase.