I had a bunch of questions before ordering and they were very patient with me. Ended up getting exactly what I needed and the price was good too.
Sauna Heater Size Calculator
📏 Measure Your Sauna Space
Accurate dimensions ensure the perfect heater match
🎯 Why Dimensions Matter
Your sauna's volume (length × width × height) is the most critical factor in selecting the right heater. A heater that's too small won't reach proper temperature, while one that's too large wastes energy and can overheat your space.
Pro Tip: Measure the interior space of your sauna where you'll actually sit. Don't include wall thickness or equipment areas.
Total Cubic Feet Volume of the Sauna
0 cu ft
❄️ Cold Surfaces & Insulation
These factors significantly impact heating requirements
🪟 What Are Cold Surfaces?
Glass doors, windows, tile walls, brick, concrete, and stone absorb significantly more heat than wood. These materials require extra heating power to maintain proper sauna temperature.
How to Measure: Enter each glass door, window, or non-wood surface separately using the "+ Add Another Surface" button below. For a full-glass front, enter its full width and height. Each heater brand has its own rule for how much heating power cold surfaces require (2–4 cu ft per sq ft) — we apply it automatically based on the brand you choose in the next step.
Choose wisely: Poor insulation adds 15% to your heating needs. Well-insulated walls keep heat in and reduce energy costs.
Total Square Feet of Cold Surfaces
0 sq ft
💡 Note: The floor doesn't count as a cold surface since you're sitting above it. Focus on walls, doors, and windows.
🌍 Location & Climate
Environmental factors affect heating performance
🌡️ Why Location & Climate Matter
Outdoor saunas face wind, cold air, and temperature fluctuations that require more heating power. Cold climates compound this effect, so we add a percentage of your base volume to compensate.
Location impact: Indoor saunas benefit from home heating, while outdoor saunas must combat external temperatures and weather.
Why we ask: Each manufacturer publishes its own guidance for how much extra heating power glass and other cold surfaces require. We apply your preferred brand's sizing guidance — or every brand's guidance if you have no preference.
🎯 Your Perfect Heater Match
Personalized recommendations based on your specifications
📊 Your Adjusted Sauna Volume
0 cu ft
📋 Calculation Breakdown
How we calculated this: We started with your base volume, then added each manufacturer’s own allowance for cold surfaces (HUUM 3.3, Harvia & Finlandia 3.94, Saunum 3.0, Scandia 2.0 cu ft per sq ft), plus adjustments for insulation quality and location/climate, so your heater can maintain optimal temperature (150-195°F) even in challenging conditions.
✨ Your Recommended Heaters
Perfectly matched to your sauna specifications
Still not sure? All recommended heaters will work for your space. Consider factors like: brand preference, built-in vs external controls, and aesthetic design. Need help? Contact our sauna experts for personalized guidance!