Sauna heaters explained: wood-fired, electric, infrared, propane and more

Wood-fired

A wood stove heats stones and the air in the room, and you can pour water on the stones for steam. Many people love the crackle, the smell and the soft, enveloping heat. Wood-fired saunas don't need electricity, which makes them a natural fit for rentals, cabins and remote spots.

The trade-offs: you need dry firewood, someone has to tend the fire, and the chimney and clearances must be set up correctly. Heat-up time depends on the sauna's size and the weather. Check local fire rules, especially during dry seasons.

Electric

An electric heater also heats stones and air, so you still get steam when you pour water. It's easy to control with a dial or timer and is the most common heater in home and gym saunas.

The key question is power. Many electric heaters need a dedicated circuit, and larger ones need more electrical capacity than an ordinary outlet. Have a licensed electrician check your supply before you buy or install one, and when renting, ask the owner exactly what power they need on site.

Electric with Wi-Fi

This is an electric heater you can control from your phone, usually through the maker's app. The big convenience is starting it remotely so the sauna is hot when you get home. Check that your Wi-Fi reaches the sauna (outdoor saunas are often at the edge of the signal), which app it uses, and which safety limits it has, such as automatic shut-off. Power and installation needs are the same as any electric heater.

Infrared

Infrared saunas use panels instead of a stove. They run at lower air temperatures and warm you more directly, and they usually heat up quickly. Most are electric indoor units. There are no hot stones to pour water on, so the experience is drier and different from a traditional sauna. Some people prefer it; others want the steam.

Hybrid

A hybrid setup combines two heat sources, most often a traditional heater with infrared panels, so you can choose between classic heat with steam and gentler infrared, or use both. Because "hybrid" can mean different combinations, ask the seller exactly which heat sources it has and what power or fuel each one needs.

Propane

Propane (gas-fired) heaters heat stones and air like a wood stove but without hauling firewood, and they can work where there's no electricity. They need proper venting and a safe fuel supply, so installation should be done by a qualified gas installer following the maker's instructions and local codes. Check what ventilation and safety devices (such as carbon monoxide detection) the maker requires.

No heater

Some saunas are sold without a heater, for example when the seller kept theirs or the buyer wants to choose their own. You'll need to buy a heater sized for the room following the maker's guidance, and budget for professional installation. Factor that into the price when comparing listings.

Comparing them at a glance

• Steam (pouring water on stones): wood-fired, electric, electric with Wi-Fi and propane yes; infrared no; hybrid depends on the setup.
• Needs electricity: electric, electric with Wi-Fi and infrared yes; wood-fired and propane usually not.
• Hands-on to run: wood-fired is the most involved; electric and infrared are set-and-go, and Wi-Fi models can be started from your phone.
• Setup checks: clearances and chimney for wood; venting and a gas installer for propane; a suitable electrical supply for electric and infrared.