Harvia Sauna Heater Stones, Rounded Olivine, 5-10cm, 33lbs (R-991)
Harvia
These stones are added on the heater page, where the right amount for your heater is worked out for you. Pick your heater or stove and choose these stones in the "Choose your stones" step.
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- Description
- What's Included
- Product Specifications
- Fits These Models
- Installation & Use Notes
- FAQs
- Downloads
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.
Choose options
- Description
- What's Included
- Product Specifications
- Fits These Models
- Installation & Use Notes
- FAQs
- Downloads
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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FAQ
Ordering & Payment
Are you an authorized dealer?
Yes. We're an authorized dealer for every brand we carry, so your purchase includes the full manufacturer warranty.
Do you offer financing?
Yes. You can pay over time with Shop Pay Installments at checkout on orders up to $30,000. Available plans and rates depend on your order total and approval, and you'll see your options before you pay.
Shipping & Delivery
Where do you ship?
We currently ship within the continental United States only. We don't ship to Alaska, Hawaii or Canada at this time.
How long will my order take?
Orders are processed within 1-2 business days, and orders placed before 2 PM EST start processing the same day. Orders don't process or ship on weekends or holidays, so anything placed after 2 PM on Friday or over the weekend starts processing the next business day. In-stock items usually arrive within 3-9 business days.
Some products are made to order and take longer. When that's the case, the lead time is listed on the product page.
How does freight delivery work?
Larger items ship by freight. Here's what to expect:
- The carrier will call to schedule a delivery window, Monday to Friday
- Someone 18 or older needs to be there to receive and sign for it
- Delivery is curbside, lowered by liftgate to your driveway or nearest accessible spot
- Please double check your phone number at checkout so you don't miss the carrier's call
Installation
Does it come assembled?
It depends on the product. Some items arrive ready to use, while others need assembly. Check the product page for what's included, and download the manual for full setup instructions.
Do I need a professional to install it?
Many products can be set up yourself. For anything involving a natural gas line, hardwired electrical or built-in installation, we recommend a licensed professional and checking your local codes.