Electric vs wood-burning sauna heaters

The short verdict: if 240 V to your sauna is easy, electric is more convenient and most people should take it. If that run is long, trenched or expensive — which on a typical suburban lot it is — a wood stove removes the cost entirely and gives you a heat many enthusiasts prefer. The lead time is what you pay instead.

How wood stoves are rated

Wood stoves publish an electric-equivalent rating — "9–15 kW equivalent", "15 kW equivalent" — because that is the only comparison that means anything across the two technologies. A 15 kW-equivalent stove puts out considerably more heat than any residential electric heater, which is why wood-fired is the natural answer for large rooms and hard winters.

Two specs separate a stove that lasts a decade from one that rusts through in three winters:

• 304 stainless steel. The correct grade for a hot, wet outdoor environment. A stove that names the grade is telling you something; one that says only 'stainless steel' is telling you less.
• Published stone capacity in pounds. Thermal mass determines how the heat behaves after the fire dies down and how well it takes a water throw. One stove in our survey publishes 55 lb — and note the stones are usually not included at that weight.

The install cost is the real comparison

Every electric heater above roughly 4.5 kW needs 240 V. To the back of a garden that means a trench, conduit, a permitted circuit and an electrician's time. We cannot give you a figure — it depends entirely on distance, local permit regime and rates — but it is routinely the largest single line in an outdoor sauna budget.

A wood stove needs none of it. What it needs instead is a correctly installed chimney with correct clearances, which is a specified job with a documented spec rather than an open-ended cost. That asymmetry is the substance of this decision. Full detail in the electrical guide.

The heat genuinely differs

An electric heater holds a setpoint. A wood stove peaks and declines with the fire, so a session has an arc — hottest shortly after a good load, gentler as it burns down. Many enthusiasts prefer that, and a stove with a large stone mass smooths it considerably.

There is also the fire itself: the sound, the smell, the ritual of building it. That is not a specification and we are not going to pretend it is, but it is why people who could easily run a circuit choose wood anyway.

The honest downsides of wood

1. 145 minutes of lead time, attended, every session. You cannot decide to have a sauna in twenty minutes. In January that means standing outside lighting a fire.
2. 2Ash management. A removable ash tray makes it a 30-second job; without one it is a chore. Check for it.
3. 3Firewood storage. Dry, seasoned wood, under cover, in quantity — that is a space commitment.
4. 4Chimney maintenance. Flues need periodic inspection and cleaning.
5. 5It cannot go indoors or attached without serious flue engineering, and often not at all.

Running cost

Electric: a 6 kW heater at rated draw for 45 minutes is 4.5 kWh, about $0.77 at $0.17/kWh — and the real figure is lower because the elements cycle once the room is up to temperature. Wood: the cost of the firewood you burn, which varies enormously by region and by whether you buy it or cut it.

Neither is expensive per session, and running cost should not decide this. Install cost and lead time should. Full arithmetic in sauna running costs.

Which to buy

Electric if the sauna is indoors, attached, or close enough to the panel that a circuit is straightforward — and if you value being able to press a button and sit down 30 minutes later.

Wood if the sauna is a freestanding outbuilding, the electrical run is long, you live somewhere genuinely cold, or you actively want the ritual. It is not the budget option so much as the option that removes a different cost entirely.

Every pick on this page comes from published specifications, not from hardware we own. Read how we pick — including what spec-led ranking cannot tell you.