Harvia R-991 sauna heater stones for electric sauna heaters, home and commercial use

Harvia

Harvia R-991 Sauna Heater Stones

HSA/FSA Accepted
FDA Registered

The Harvia R-991 Rounded Olivine Diabase Sauna Heater Stones are premium 5–10 cm rounded stones designed to sit on the top layer of your sauna heater, helping create a softer steam experience by allowing water to flow deeper through the stone bed for greater surface contact. Each box includes 33 lbs of natural stones, ideal for refining steam feel and upgrading the look of your heater.

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$140.00
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Harvia R-991 sauna heater stones for electric sauna heaters, home and commercial use

Rounded Stones Designed for Softer Steam

The Harvia R-991 stones are crafted from natural olivine diabase and shaped with a rounded profile specifically for top-layer use on sauna heaters. Unlike angular stones, the rounded design allows water to cascade downward through the stone bed, increasing contact with heated surfaces and producing steam that feels smoother and more evenly distributed.

These stones are compatible with all sauna heaters when used as the top layer and pair best with angular stones beneath, which handle the primary heat load. This combination helps balance strong heat retention with a more comfortable steam response.

Important note: These stones are intended for top-layer placement only and are typically purchased alongside a compatible Harvia sauna heater or stove.

Harvia Cilindro PC80E cylinder sauna heater with sauna stones in a home sauna

Gentler Löyly and a More Refined Sauna Feel

R-991 stones help achieve a sauna environment that feels smoother and more controlled by improving how steam is created and distributed. Their rounded shape allows water to travel deeper into the stone bed rather than evaporating instantly on the surface, producing a fuller, more even wave of steam that spreads through the room instead of hitting all at once.

The result is a sauna environment that feels smoother and more controlled, where heat and humidity work together rather than competing.

This setup is ideal for:

  • You want soft, enveloping steam instead of sharp bursts
  • You’re refining the quality of your sauna sessions, not just increasing heat
  • You want better water penetration through the stone bed for consistent steam release
  • You prefer a traditional Finnish-style löyly with gradual, natural heat transitions

Product Specifications

  • Model: R-991
  • Product Type: Sauna heater stones
  • Stone Material: Rounded olivine diabase
  • Stone Size: 5–10 cm (2–4 inches)
  • Box Weight: 33 lbs
  • Intended Use: Top-layer placement on sauna heaters
  • Compatibility: Suitable for all sauna heaters when used as top-layer stones
  • Recommended Pairing: Angular sauna stones underneath for optimal heat and steam balance
  • Stone Characteristics: Natural variation in shape and size