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Father's Day Sale — Ends Jun 21

Dad won't buy it for himself. He's been talking about it for years. Jun 21 is your window.

Father's Day VIP pricing by phone through Jun 21. Size his sauna below — then one call does the rest.

Free Expert Tool

Sauna Heater Size Calculator

Enter your room dimensions and we will calculate the exact kW you need — then show you matching heaters from Huum, Harvia, Narvi & more.

✓ Free & Instant ✓ No signup needed ✓ Expert-verified formula
1
Dimensions
2
Glass & Stone
3
Setting
4
Results
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Step 1 of 3

Define Your Sauna Space

Enter your sauna room dimensions in feet. Already know the total volume? Enter that instead.

— or enter total cubic volume —
💡 A typical 2-person home sauna is 200–350 cu ft. Multiply L × W × H to get yours.

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Step 2 of 3

Cold Surfaces Matter

Glass panels and uninsulated stone/concrete walls drain heat rapidly. Each sq ft of glass is equivalent to 7 extra cu ft of volume. Do not include the floor.

— or enter total cold surface area —
💡 No glass or stone walls? Leave blank and continue — we will use your room dimensions only.
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Step 3 of 3

Indoor or Outdoor?

Outdoor and uninsulated saunas require 50% more heater power to compensate for heat loss to the environment.

Your Personalised Recommendation

Here Is Your Ideal Heater Size

kW

Minimum recommended power

Adjusted volume cu ft
Setting
Rule of thumb 1 kW per 45 cu ft
⚠️ Always size up to the next available kW — never down. A slightly oversized heater runs cooler and lasts longer.

Matching Heaters From Our Catalog

Not 100% sure? Talk to a real specialist — free.

We size heaters all day. One call and you will know exactly what to order.