Harvia Sauna Heater Stones, Rounded Olivine, 5-10cm, 33lbs (R-991)
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Rounded Olivine Diabase sauna heater stones resemble nature's rounded stones from the great rapids, bringing a softer tone to your sauna along with multiple benefits. Sold in 33 lbs boxes. Fits the Harvia Spirit SP60E, Spirit SP80E and Spirit SP90E. Supplied in natural stone.
We recommend using angular stones in the bottom layers as they give more heating surface area for the water. This combination provides the best result for soft steam and effective heat generation, especially in heaters with smaller stone capacity.
- Elegant rounded sauna heater stones made of olivine diabase
- Selected, clean and safe to use
- Rounded stones provide more softer steam
- Needs to be piled loosely to guarantee good air circulation and longer heater life
33 lb box of 2" to 4" (5-10 cm) sauna stones
| Harvia Part Number | R-991 |
| Color / Finish | Natural Stone |
| Material | Natural Stone |
| Dimensions | 2" (5 cm) x 4" (10 cm) |
| Weight | 33 lbs |
| Warranty | 2 years (consumer use, +1 year if registered with Harvia); 2 years (commercial use) |
| Ships | Parcel |
| Made In | Finland |
Harvia lists these stones for the following heaters and stoves.
SpiritHarvia Spirit SP60E, Harvia Spirit SP80E, Harvia Spirit SP90E
- Sauna stones are not a decorative topping — they are the thermal mass that makes a sauna a sauna.
- Rinse before loading to wash off dust.
- Stack loosely by hand, largest at the bottom. Never wedge, hammer or pack them.
- Re-stack once a year and replace any that have split or crumbled.
What does the Harvia Sauna Heater Stones, Rounded Olivine, 5-10cm, 33lbs (R-991) fit?
Harvia lists it for the Spirit series. These parts are size-specific — check your exact model against the list above, not just the series name.
How many boxes of stones do I need?
Each box holds 44 lb, except the rounded R-991 at 33 lb. Your heater's product page gives its stone capacity and the number of boxes Harvia specifies. Order one box more than the minimum so you can set aside any that will not stack cleanly.
How often should sauna stones be replaced?
Re-stack them once a year and replace any that have cracked or crumbled. Stones break down with thermal cycling, and a bed of broken fragments chokes the airflow the heater needs to survive.
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