Finlandia FLB-80 Sauna Heater (300 – 425 cu ft)
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Finlandia FLB-80 Sauna Heater
Wall-mounted electric heater with built-in controls — timer and thermostat mounted directly on the heater, no separate wall control required. Rated for rooms up to 300 – 425 cu ft. Built-in 60-minute timer plus 1–8 hour time delay.
Choose Your Package
- Heater Only — Heater unit with built-in controls. Source your own stones (recommended 45 lbs of Finnish peridotite).
- Heater + Stones — Includes 45 lbs of Finnish peridotite igneous stones.
Why the FLB-80?
The FLB-80 is the largest heater in Finlandia's FLB series: 8 kW of traditional Finnish heat with the timer and thermostat right on the heater. It is rated for rooms of 300 – 425 cu ft, so it fits most family-size home saunas. Its 8 kW elements are heavy-duty Incoloy. The interior is stainless, and the welded unibody casing has a glossy powder-coated enamel finish. Made in Finland.
Key Specifications
| Model | FLB-80 (Red Enamel) / FLB-80-S (Stainless exterior) |
| Power | 8.0 kW (8,000 W) |
| Room size | 300 – 425 cu ft |
| Voltage / phase | 240V, single phase |
| Controls | On heater: thermostat, 60-min timer, 1–8 hr delay start |
| Dimensions | 16" W × 11" D × 24" H |
| Stone capacity | 45 lbs |
| Use | Residential only. Not for commercial use because of the delay timer. |
Is the FLB-80 Right for Your Room?
Multiply length × width × height (in feet) to get cubic feet. For example:
- 7' × 7' × 7' = 343 cu ft. A good FLB-80 fit.
- 7' × 8' × 7' = 392 cu ft. A good FLB-80 fit.
- Under 300 cu ft: choose the FLB-60 (170 – 300 cu ft) or the FLB-45 instead.
Glass doors or walls, stone or tile surfaces, and uninsulated outdoor walls all add heat load. Try our sauna heater sizing tool, or compare other 8 kW sauna heaters.
Installation & Safety
The FLB-80 runs on 240V single phase and must be permanently hardwired by a licensed electrician, following local code. Please follow the Finlandia FLB installation manual:
- For installation steps and electrical requirements, see page 2 of the Finlandia FLB installation manual (PDF).
- For safety clearances, ventilation, and minimum ceiling height, see page 3 (Figures 2–4 and Table 1).
- For thermostat sensor placement, see page 4.
- For the FLB-80 wiring diagram, see page 5.
- For troubleshooting and general information, see page 6.
Every home is a little different, so we recommend having your licensed electrician review the specs in the installation manual during install to make sure everything meets your local codes. Questions along the way? We're happy to help.
Every heater needs a wood guard. See our heater guards made for FLB heaters.
What's in the Box
- FLB-80 heater with built-in thermostat and timer
- Mounting hardware, thermostat bulb guard, and wood molding
- "CAUTION" and "WARNING" safety signs
- Installation and operation manual
- 45 lbs of sauna stones, only with the "Heater + Stones" package. You can also buy Finnish peridotite sauna stones separately.
Controls Compatibility
- Built-in (included): thermostat, 60-minute timer, and 1–8 hour delay start, all on the heater.
- You can move the controls to the side of the heater, which helps when access is tight.
- Want a digital wall control or Wi-Fi? The FLB isn't designed for an external control. Look at the Finlandia FIN-80 (same body, external control) or Harvia heaters with wall controls instead.
How It Compares
| Heater | Controls | Best for |
|---|---|---|
| Finlandia FLB-80 | Built-in thermostat and timer | Simple, proven, wall-mounted heater with no extra control to buy |
| Harvia KIP-80 (B1) | Built-in | Sister model. Finlandia's manual covers the KIP-80-B1 and FLB-80 together. |
| Finlandia FIN-80 | Separate wall control | Buyers who want the control outside the hot room |
| HUUM (e.g., Drop / Hive) | Separate digital or app control | Modern design, big stone mass, Wi-Fi |
| EOS (e.g., Cubo / Invisio) | Separate premium control | High-end and commercial builds |
Ask us for a side-by-side quote for your room.
Why Buy From Finnish Sauna Builders
- Real sauna builders. Our shop is in Lake Forest, Illinois, and we design and build saunas every day.
- Expert sizing and wiring help before and after you buy. Contact us anytime.
- Authorized dealer for Finlandia, Harvia, HUUM, EOS, and more.
- One place for heater guards, stones, accessories, and full sauna kits.
Frequently Asked Questions
What size room does the FLB-80 heat?
It is rated for 300 – 425 cu ft.
What electrical service does it need?
It runs on 240V single phase and must be hardwired by a licensed electrician. Breaker and wire requirements are on page 2 of the Finlandia FLB installation manual.
Do I need a separate control?
No. The thermostat, 60-minute timer, and 1–8 hour delay are built into the heater.
Are stones included?
Only with the "Heater + Stones" package, which includes 45 lbs of Finnish peridotite. The heater holds 45 lbs.
How much clearance does it need?
Safety clearances and minimum ceiling height are on page 3 of the installation manual (Figures 2–4 and Table 1).
Can I use it in a commercial sauna?
No. Finlandia says the FLB isn't for commercial use because of the delay timer.
What's the difference between FLB-80 and FLB-80-S?
The exterior finish: Red Enamel or Stainless Steel.
Downloads & Manuals
- FLB Heater Installation & Operation Manual (PDF). Get it from our Downloads & Manuals page.
Frequently Asked Questions
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