Electric vs Wood-Burning Sauna Heaters NZ Which Is Right For You?
As sections get smaller and homes are built closer together, more New Zealanders are moving toward electric sauna heaters. No flue, no smoke, no consent complications. and you can have a session running at the touch of a button. But wood-burning still has a loyal following in New Zealand, and for good reason. This guide breaks down both options honestly so you can make the right call for your build.
Why Your Heater Choice Matters More Than You Think
The heater is the heart of a sauna. Everything else, the timber, the layout, the ventilation are all designed around it. Choosing between electric and wood-burning isn't just a technical decision, it shapes how your sauna feels, how convenient it is to use, and what's actually possible given your property and location.
Both types produce an outstanding sauna experience. But they work differently, and each comes with trade-offs worth understanding before you commit.
How Electric Sauna Heaters Work
An electric sauna heater heats a bed of stones, you throw water on them, they produce steam. That's the basics of it.
Where quality heaters differ is in how well they heat those stones. A well-engineered heater heats the stone mass deeply and evenly, which produces soft, sustained löyly rather than a quick burst that fades. The stone mass does the work, the more thoroughly it's heated, the better the steam.
Electric heaters generally come in two configurations. The simpler option has manual controls built directly onto the heater itself, you set the temperature and timer on the unit. The other option uses an external controller mounted on the sauna wall, which gives you a thermostat, a timer, and the ability to delay start so the sauna is ready when you arrive. For everyday home use, the external controller is worth it.
Electric heaters are sized by kilowatt output matched to your room volume. As a rough guide, allow around 1 kW per cubic metre of sauna space. Not sure what size you need? Use our sauna heater sizing calculator to get a recommendation based on your specific room dimensions.
Browse our range of electric sauna heaters.
How Wood-Burning Sauna Heaters Work
A wood-burning sauna heater burns wood in a firebox, heats a large mass of stones above it, and you throw water on those stones to produce steam. Same principle as electric, different experience entirely.
The stone mass is what matters most. Quality wood-burning stoves like the Narvi range are engineered around generous stone capacity, which is what produces soft, sustained löyly rather than a sharp burst of steam that disappears quickly. Narvi have been building heaters in Finland for over 80 years and make no compromises on this, every stove is designed around optimal stone load first.
The other thing wood-burning stoves deliver that electric can't is its "atmosphere". The crackle of the fire, the smell of wood burning, the slow build of heat as the stove comes up to temperature. For a lot of sauna enthusiasts, that ritual is half the point. It does mean planning ahead though, a wood-burning sauna needs to be lit an hour or two before you want to use it, and it needs tending while it heats.
Electric vs wood-burning Sauna Heaters. NZ Comparison
| Electric | Wood-Burning | |
|---|---|---|
| Heat-up time | 30–45 minutes | 1–2 hours |
| Installation | Registered electrician required | Certified fireplace installer required |
| Running cost | ~$1.50–$4.50* per session | Depends on wood supply |
| Convenience | High, timer and delay start | Lower, requires fire management |
| Suburban/urban use | Ideal | Check local council rules |
| Council consent (NZ) | Generally not required | Check with your local council |
| Löyly quality | Excellent with quality heater | Often described as superior |
| Maintenance | Low | Moderate, ash removal and flue checks |
| Temperature control | Precise, external thermostat | Manual |
* Running cost estimate based on a 6–8 kW heater at current NZ electricity rates. Costs vary by region and provider.
Installation in New Zealand. What's Actually Involved
Electric installation requires a dedicated circuit, typically 32A or 40A depending on heater size. A registered electrician connects the heater. a straightforward job for any competent sparky and usually completed in a day. The heater mounts inside the sauna room on the wall or floor. Please consult with your local registered electrician.
Wood-burning installation requires a flue that exits the building safely, with correct clearances from combustible materials. Installation must be carried out by a registered and certified fireplace installer, and you should check with your local council regarding consent requirements before you build. You'll also need to consider firewood storage and ash disposal as part of your setup.
In New Zealand's denser urban environments. Particularly Auckland, Wellington, and Christchurch. electric is almost always the more practical and straightforward path.
Running Costs in New Zealand
A 6–8 kW electric heater running through a heat-up and session typically uses 6–10 kWh. At current NZ electricity rates that works out to roughly $1.50–$4.50* per session, varying by region and provider.
Wood-burning running costs depend entirely on your supply. Access to free or cheap firewood makes per-session costs negligible. Buying seasoned hardwood in Auckland brings the cost closer to electric. With the added consideration that wood needs to be kept dry.
Neither option is very expensive to run. You can't put a cost on the convenience of having your own private sauna.
The Löyly Question
Löyly is the Finnish word for the steam produced when water hits hot sauna stones. It's central to the sauna experience. the softness of the steam, how it rises, how long it lasts, how it feels on your skin.
Many experienced sauna users argue wood-burning stoves produce better löyly, largely because they carry more stone mass heated over a longer burn. Deeply heated stones release steam more gently and sustain it longer.
That said, a quality electric heater with a generous stone load can produce excellent löyly. The key is choosing a heater that takes stone mass seriously, not just a heating element with a handful of stones balanced on top. If löyly quality is your priority and you're going electric, invest in a heater built around proper stone volume.
See our top-rated electric heaters for löyly quality.
Outdoor vs Indoor Saunas in New Zealand - which heater is best?
For standalone outdoor sauna cabins. a growing trend across New Zealand. both heater types are viable, wood-burning suits the aesthetic of a traditional timber cabin well, and flue installation is simpler when building from scratch.
For indoor saunas built inside a home, garage, or sleepout, electric is almost always the better choice.
NZ Regulations and Council Consent
This is worth checking before you finalize your heater choice.
Electric sauna heaters generally don't require building consent in New Zealand, provided the electrical work is carried out by a registered electrician and the sauna structure itself falls within exempt building work thresholds.
Wood-burning heaters are more complex. Installing a solid fuel burner may require building consent depending on your region and the nature of the installation. Some councils. particularly in urban areas. also have air quality rules that restrict solid fuel burning during certain conditions. Auckland Council's clean air rules are worth reading if you're in the region.
If in doubt, check with your local council before your choose your heater, It can also be worth contacting your insurance company notifying them you have a sauna.
Day-to-Day Reality
How spontaneous do you want your sauna sessions to be?
An electric heater with a digital controller can be switched on remotely or set to a timer and will be ready when you walk in. After the session, you leave. The heater cools on its own. There's no preparation, no tending, no wind-down.
A wood-burning sauna needs the fire lit an hour or two beforehand. You tend it during heat-up. Afterwards, you confirm it's fully out before leaving. If you love that ritual. and many sauna enthusiasts genuinely do. it adds to the experience. If you want a session after work on a Tuesday with no planning involved, electric is the clear choice.
So Which Should You Choose?
Choose electric if:
You're in an urban or suburban NZ property You want convenience and spontaneous use You're building indoors or converting an existing space You want precise temperature control You'd prefer to avoid consent and flue complications.
Choose wood-burning if:
You're building a standalone outdoor cabin with space for a proper flue The ritual of firing a sauna is genuinely part of the appeal You have reliable, affordable access to firewood You want the most traditional sauna experience possible Löyly quality is a top priority and you're happy to plan sessions in advance.
A Note on Heater Quality
Whichever type you choose, quality makes an enormous difference. A cheap electric heater with minimal stone mass will never produce the experience a well-engineered Finnish heater delivers. The same applies to wood-burning, a lightweight stove won't hold heat the way a properly built kiuas does.
Finnish manufacturers have been building sauna heaters for generations and that heritage shows in the engineering: stone capacity, element design, material quality, longevity. The heater is the one component you can't compensate for elsewhere in the build. It's worth getting right. After all Finland is the birth place of sauna.
Final Thoughts
There's no universally right answer between electric and wood-burning. Both can deliver an exceptional sauna experience when chosen thoughtfully and installed correctly.
What's changed in New Zealand is the context. Smaller sections, tighter neighbourhoods, and busier lives have made electric the practical choice for most residential builds. wood-burning remains the gold standard for those with the space, the setup, and the inclination to do it properly.
If you're working through your build, start with our sauna heater sizing calculator to find the right kW for your room. And if you want to talk through your setup in more detail, get in touch with us at Kauri Point Sauna. We're happy to help you get it right.
