Finnleo Designer SL2 4.5 kW (240V 1PH) Sauna Heater

Finnleo Designer SL2 4.5 kW (240V, 1-Phase) Electric Sauna Heater

The Finnleo Designer SL2 4.5 kW (240V, 1-Phase) Electric Sauna Heater is a compact, wall-mounted sauna heater engineered for home saunas ranging from 100 to 210 cubic feet. Manufactured in Finland to Finnleo's exacting standards and backed by Finnleo/Sauna360 in Cokato, Minnesota, the Designer SL2 delivers fast, deeply penetrating heat and rich, authentic steam by holding up to 33 lbs of sauna rocks in direct contact with the heating elements. It's the ideal choice for smaller or space-conscious sauna builds that still demand a genuine Finnish sauna experience.

Designed to keep your sauna floor clear and your layout flexible, the Designer SL2 mounts directly to the wall, giving your sauna a clean, modern look while freeing up valuable bench and floor space. Available in 4.5 kW, 6.0 kW, and 8.0 kW versions to match rooms of nearly any size, the 4.5 kW single-phase model is purpose-built for smaller home saunas without sacrificing performance or heat quality.

Key Features

• Space-Saving Wall-Mounted Design: Mounts to the wall to keep the sauna floor clear, freeing up bench space and giving your sauna room a clean, modern aesthetic.
• 4.5 kW Heating Output: Sized specifically for saunas between 100 and 210 cubic feet, running on 240V single-phase power for reliable, efficient performance.
• Rock Capacity: Holds up to 33 lbs of sauna rocks, positioned in direct contact with the heating elements for fast heat-up, authentic steam, and consistent, penetrating warmth.
• Compact Dimensions: Approximately 16"W x 11.5"D x 24"H, fitting easily into smaller sauna cabins without crowding the room.
• Strong Steel Construction: Built with a rust-resistant, tough steel housing designed to withstand the demanding humidity and temperature swings of regular sauna use, including exceptional performance in outdoor saunas.
• Made in Finland: Manufactured to trusted Finnish quality standards with every unit.
• Pairs with SaunaLogic2® Control: Compatible with the SaunaLogic2 smart control system, available in Wi-Fi or non-Wi-Fi versions, letting you manage heat, timing, and lighting from a sleek touchscreen or the SaunaLogic2 mobile app (iOS and Android).
• Remote & App Control (with SL2 Control): Start, stop, and adjust your sauna from anywhere, schedule delayed starts up to 24 hours in advance, and save favorite settings for fast, one-tap access.
• Integrated Lighting Compatibility: The SaunaLogic2 control lets you turn sauna lighting on and off alongside heat settings, with optional mood lighting add-ons available.
• Flexible Configuration: Available as Heater Only or bundled with the SaunaLogic2 control package to match your installation needs.
• Safety Certified: ETL listed and safety-tested for use in wet, high-heat environments throughout North America.
• Energy Efficient: Fast heat-up with smart power use, so you spend less time waiting and more time enjoying your sauna.
• Easy Maintenance: Simply wipe down the heater as needed and replace the rocks every 1-3 years—no complicated upkeep required.
• Industry-Leading Warranty: Backed by Finnleo's 5-year residential sauna heater warranty, with friendly, knowledgeable technical support based in Cokato, Minnesota.

What's Included

• Finnleo Designer SL2 4.5 kW electric sauna heater (wall-mounted)
• Sauna rocks (up to 33 lbs, included with every unit)
• SaunaLogic2® control panel (Wi-Fi or non-Wi-Fi version, depending on configuration selected)
• CB (contactor) box
• Wiring for heater and control connection
• Manufacturer's 5-year residential warranty

Note: The Designer SL2 is offered as Heater Only or as a bundled package with the SaunaLogic2 control. Professional installation by a licensed electrician is recommended for all configurations.

Construction & Design

The Designer SL2 features a rugged, wall-mounted heater body constructed from strong, rust-resistant steel built to endure the harsh, high-humidity environment inside a sauna, including outdoor sauna installations. Its compact housing is engineered to maximize rock contact with the heating elements, a hallmark of the Finnleo Designer line, ensuring heat transfers efficiently for a traditional, high-quality sauna experience rather than the drier heat produced by lower-capacity heaters. Every unit is manufactured to Finnish quality standards and is ETL listed for safe use in wet environments.

Control System

The Designer SL2 4.5 kW is designed to integrate with Finnleo's SaunaLogic2® control system, a sleek, modern, water-resistant, full-glass touchscreen display with a slim profile (approximately 3-3/8" wide x 5-1/2" tall x 1/4" deep) that can be mounted inside or outside the sauna room. With the Wi-Fi enabled version, the SaunaLogic2 mobile app (available on iOS and Android) lets you:

• Start your sauna, adjust the temperature, set a timer, or turn on the lights from anywhere—your couch, car, or office
• Schedule delayed start times up to 24 hours in advance, so your sauna is ready when you are
• Save your favorite temperature and lighting settings for fast, one-tap access
• Check sauna status remotely for added peace of mind

The control is UL/ETL certified and safe for wet environments, and optional add-ons such as mood lighting and a Bluetooth soundbar can further enhance the sauna experience.

Rocks Included

Every Designer SL2 4.5 kW heater ships complete with up to 33 lbs of sauna rocks, so there's no need to source rocks separately. The rocks sit in direct contact with the heating elements, a key part of the Designer SL2's fast heat-up and quality steam production. For long-term performance, Finnleo recommends replacing the rocks approximately every 1 to 3 years.

Why Choose the Finnleo Designer SL2

Finnleo, manufactured by Sauna360 in Cokato, Minnesota, is one of the most established names in authentic Finnish sauna heating. Every Finnleo heater, including the Designer SL2, is safety-tested and ETL listed for North American use, and works seamlessly within the SaunaLogic2® ecosystem to unify your heater, lighting, and sauna experience into one convenient, app-controlled system. Backed by an industry-leading 5-year residential warranty and dedicated Minnesota-based technical support, the Designer SL2 4.5 kW delivers the reliable, penetrating heat that defines a genuine Finnish sauna session—whether you're building a compact home sauna or upgrading an existing one.