Carbon Smart Saunas - 3' x 4' x 8' - by Finnish Sauna Builders

A complete interior sauna kit sized for tight spaces — Thermo Poplar wood, precision-cut to your dimensions, with everything needed to finish the interior once your walls, insulation, and wiring are in place.

Right For You If…

• You have a small or narrow space and want a real sauna built to fit it, rather than a larger footprint that won't work
• You're comfortable with (or hiring for) framing, insulation, and electrical work, and want the interior finish handled by a dedicated kit
• You want wood specifically modified for sauna humidity and heat conditions rather than standard lumber

What Makes It Worth It

• Thermo Poplar wood, thermally modified at approximately 374°F — chemical-free process for improved humidity and heat resistance, plus a warm, rich tone
• Precision-cut to your room's dimensions — components arrive ready to install rather than requiring on-site cutting
• Customizable bench configuration — choose the layout that fits your space
• Complete finishing kit — includes wall and ceiling boards, bench boards, corner moldings, duckboard flooring, vent grills, all-glass door, sauna bucket and ladle, thermometer, headrest, and a vapor-proof light
• Responsibly sourced wood — part of a carbon-conscious forestry sourcing line

Specs at a Glance

Sauna Heater Comparison Chart

Feature	Harvia KIP45B 4.5KW	Harvia KIP45W 4.5KW	HUUM Cliff Mini 3.5KW
Product Image
Power Output	4.5 KW	4.5 KW	3.5 KW
Cubic Feet Coverage	176 - 353 cu ft	176 - 353 cu ft	106 - 247 cu ft
Control Type	Built-in Control	WiFi Control	WiFi Control
WiFi Connectivity	❌ No	✅ Yes	✅ Yes
Heater Stones Included	✅ Yes	✅ Yes	✅ Yes
Railing Included	❌ No	❌ No	✅ Yes
Brand	Harvia	Harvia	HUUM
Model	KIP45B	KIP45W	Cliff Mini
Remote Control	Manual only	App-based via WiFi	App-based via WiFi

Harvia KIP45B 4.5KW

Power Output

4.5 KW

Cubic Feet Coverage

176 - 353 cu ft

Control Type

Built-in Control

WiFi Connectivity

❌ No

Heater Stones Included

✅ Yes

Railing Included

❌ No

Brand

Harvia

Model

KIP45B

Remote Control

Manual only

Harvia KIP45W 4.5KW

Power Output

4.5 KW

Cubic Feet Coverage

176 - 353 cu ft

Control Type

WiFi Control

WiFi Connectivity

✅ Yes

Heater Stones Included

✅ Yes

Railing Included

❌ No

Brand

Harvia

Model

KIP45W

Remote Control

App-based via WiFi

HUUM Cliff Mini 3.5KW

Power Output

3.5 KW

Cubic Feet Coverage

106 - 247 cu ft

Control Type

WiFi Control

WiFi Connectivity

✅ Yes

Heater Stones Included

✅ Yes

Railing Included

✅ Yes

Brand

HUUM

Model

Cliff Mini

Remote Control

App-based via WiFi