A sauna heater runs hot enough that its own manual calls for a guard around it. If children or pets can reach your sauna, plan for that before the first session.
This article covers heater guards and the rules around them. For the rest of the accessory list, start with the sauna accessories buying guide.
Short answer: fit the guard your heater’s manual calls for, don’t put a lock on the sauna door, and keep children and pets out unless an adult is with them.
What the manual says
Harvia’s KIP electric heater manual covers this in a few lines:
- A heater fence “is necessary for safety.”
- Build it from 1” x 2” or 2” x 2” softwood to match the interior.
- Attach it to the wall, at the clearances shown in the manual.
- Don’t place it higher than the top of the heater, below the rock line.
That manual is for KIP heaters. Yours may differ, so read the one that came with your heater.
A purpose-built rail
Some heater lines have a matching rail. The Harvia Spirit Safety Rail (HSP3M) is one.
| Spec | Harvia Spirit Safety Rail |
|---|---|
| Price | $233 (Select Saunas listing, October 9, 2026) |
| Fits | Harvia Spirit SP60/90 electric heaters |
| Material | Black painted, heat-treated birch |
| Mounting | Stainless steel brackets, attached to the heater |
| Size | 21.46 x 17.72 x 5.12 in. |
| Weight | 4.4 lbs |
Harvia says the birch surface “is always safe to touch.” That’s the manufacturer’s claim. The page doesn’t cite a test.
You get a rail made for the heater that mounts at the height you choose around its top. You give up $233, and it only fits the Spirit SP60/90.
Don’t lock the door
Here’s what the spec sheet won’t tell you. The obvious fix, a lock on the sauna door, is the one Harvia’s manual rules out. It says the door “must open out and should not have a lock.” Anyone inside has to be able to push out at once.
So control access one step back. If the sauna is in a basement or bathroom, close that room. For an outdoor sauna, a gated yard does the same job.
Children in the sauna
Cleveland Clinic lists people under 16 among those who should talk to a healthcare provider before using a sauna. If a child does join you, an adult stays in the room.
Other heater rules worth knowing
The same Harvia manual adds three more:
- Don’t place anything combustible over the heater. It names towels, bathing suits, and wooden buckets and dippers.
- Fasten the supplied caution sign to the wall near the heater, where people can see it.
- Each heater has a high limit control that shuts it off if it overheats.
My rule of thumb: hardware first, habits second. Fit the guard, then make “nobody under 16 goes in alone” a house rule.
If you’re still choosing a heater, the traditional sauna buying guide covers types and sizing.
Bottom line: a guard stops an accidental touch. It doesn’t replace supervision, and a lock on the sauna door isn’t the answer.
This article is general information, not safety certification advice. Follow your heater’s manual and local codes.
Sources
- Harvia, KIP electric sauna heater owner’s/operator’s manual (North America), September 17, 2015: almostheaven.net
- Harvia, Spirit SP60/90 safety railing (HSP3M) product page, accessed October 8, 2026: harvia.com
- Cleveland Clinic, “Get Your Sweat On: The Benefits of a Sauna,” August 12, 2024: health.clevelandclinic.org
- Price: The Sauna Heater listing for the Harvia Spirit Safety Rail, checked September 2026