4kW Sauna Heaters

How do I know if a 4kW heater is the right size for my sauna?

A 4kW heater is typically ideal for well-insulated indoor sauna rooms ranging from 100 to 210 cubic feet. To get a precise recommendation based on your room's specific dimensions and features, we strongly recommend using our official sauna heater size calculator to ensure the perfect fit.

What's the difference between 120V and 240V heaters?

Think of it like a garden hose—a 240V connection is like a wider hose that can deliver more "power" more quickly. While some very small heaters might use a standard 120V outlet, nearly all traditional sauna heaters, including most 4kW models, require a 240V dedicated circuit. This allows them to heat the space powerfully and efficiently. Always have a licensed electrician handle the installation to ensure everything is safe and up to code!

Can I pour water on the rocks of these heaters?

Absolutely! That amazing burst of steam, or "löyly," is what a traditional sauna is all about. Our 4kW electric heaters are designed for this, so you can splash water over the hot rocks to create that wonderful, humid atmosphere. Just be sure to use the proper tools from our sauna heater accessories collection.

What are the benefits of a WiFi-enabled heater?

A WiFi-enabled heater brings your sauna into the smart home era. The biggest perk is convenience—you can turn on your sauna from your phone while you're heading home from work or the gym, and it will be perfectly heated and ready the moment you walk in the door. It also helps with energy efficiency, as you can schedule heating times and ensure you never accidentally leave it on.

For an even deeper dive, check out our complete guide to choosing the perfect sauna heater.