Harvia R-991 Sauna Heater Stones

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.

✓ Authorized Harvia Dealer

✓ Price Match Guarantee

✓ Speak with a Wellness Expert- 1 (800) 398-3770

$140.00
Shipping calculated at checkout.
In stock, ready to ship
Logo for GOVX ID, a service used to verify military, first responder, nurse or teachers to qualify them for discounts

Discount available for Military, First Responders, Medical Workers and Teachers

Speak with a Wellness Expert

Call us at: 1 (800) 398-3770

Monday-Saturday: 9am-6pm EST

Fast & Secure Shipping

Secure shipping options are available for all products.

Price Match Guarantee

If you find a lower price from an authorized dealer, we will match or beat it whenever possible.

Secure Payments

Our website uses SSL encryption to protect your personal information and payment details. All transactions are securely encrypted to help ensure your privacy at every step of checkout.

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.

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
Here at TRO, we understand that building a wellness space at home takes planning. Our team is here to help you choose the right equipment with confidence.
Call us at 1 (800) 398-3770

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