Description
The Celsium Jonas Grand is the largest of Celsium's Jonas outdoor saunas: a deep, square-lined cabin for four to six people with room to lie out on the upper bench. PIR insulation in the walls, ceiling and floor helps it heat efficiently and hold temperature through cold weather.
A large bronze-tinted glass front looks out from tiered aspen benches, and a full-height tempered glass door opens on the left side. Thermowood clads the exterior and indoor LED lighting comes installed. Jonas saunas are handcrafted by Celsium in Lithuania; this unit is in stock at Celsium's U.S. warehouse in Illinois.
Before you order: the heater is not included. Buy a U.S.-spec Harvia or HUUM sauna heater rated 9 to 11 kW, and have a licensed electrician install it; Celsium confirms the right heater model for your sauna. The sauna also needs a solid, level foundation of at least 86.6 × 110.2 in (2.2 × 2.8 m). Installation is not included; you can assemble the sauna yourself and the warranty stays valid. Read the Celsium Shipping, Delivery & Returns section below as well.
Motion Theory Labs is an Independently Owned Authorized Celsium Dealer.
Specifications
- Model: Celsium Jonas Grand
- SKU: CELSIUM-JONAS-GRAND
- Type: Outdoor traditional sauna
- Capacity: 4 to 6 people
- Exterior Dimensions: 85.0 W × 109.6 D × 98.0 H in (2160 × 2785 × 2490 mm)
- Interior Dimensions: 73.2 W × 97.8 D × 84.3 H in (1860 × 2485 × 2140 mm)
- Weight: 1,808 lb (820 kg)
- Exterior: Thermowood
- Interior: Aspen
- Insulation: Walls, ceiling and floor insulated with 5 cm (2 in) PIR boards
- Glass: Bronze-tinted glass front; full-height 8 mm tempered glass door, left side
- Lighting: Indoor LED
- Heater: Not included. U.S.-spec Harvia or HUUM, 9 to 11 kW; Celsium confirms the model
- Electrical: Set by the heater you choose; licensed electrician required
- Foundation: Solid, level base, at least 86.6 × 110.2 in
- Assembly: Owner assembly keeps the warranty valid
- Origin: Handcrafted in Lithuania; ships from Illinois
- Use: Residential, outdoor
Wood is a natural material. Grain and color vary from sauna to sauna, and on-screen color may differ from the finished product.
Warranty
Celsium covers this sauna against material and production defects, starting from the delivery date:
- 5 years on the sauna structure (Celsium's Thermal Sauna line, which includes the Jonas).
- 2 years on other parts Celsium supplies, including the glass, lighting and other electrical components.
The warranty stays valid when you or your installer assemble the sauna. It does not cover problems caused by incorrect assembly, modification, improper electrical work or damage during installation; natural wood characteristics such as discoloration, dimensional changes or cracking from humidity; normal wear and tear; weather damage; or misuse, incorrect storage or unauthorized repairs. Follow the user manual to keep your coverage. The heater is not included and is covered by its own manufacturer's warranty.
Report a defect within 7 days of discovering it. Email support@motiontheorylabs.com with your order number and photos, and we will open the claim with Celsium for you.
Celsium Shipping, Delivery & Returns
Our standard Shipping Policy and Return and Refund Policy cover this product. Because it ships by freight directly from Celsium, some terms differ, and where they differ, the terms below govern.
Delivery
- Free curbside liftgate delivery within the contiguous United States. Your sauna ships by freight directly from Celsium's U.S. warehouse in Elk Grove Village, Illinois, and is lowered to the curb by liftgate.
- Timing: this sauna is in U.S. stock. We will confirm the ship date with you after you order.
- It arrives on a pallet of about 2,100 lb, with step-by-step installation guidelines. Plan the path from the curb to the site, and the people or equipment to move the sections, before delivery day.
Inspection
- Inspect before you sign. If the shipment has significant visible damage, refuse it.
- Report damage within 48 hours of delivery, with photographs of the sauna and packaging, to support@motiontheorylabs.com. Approved shipping-damage claims are resolved with a repair, a replacement or a full refund, with no restocking fee.
Cancellations and returns
- Cancel any time before your sauna ships for a full refund.
- Only an unopened sauna may be returned, if you request it within 30 days of delivery. Once the packaging has been opened, or the sauna assembled or used, it cannot be returned.
- Every return must be approved first. Contact us before anything ships back and we will arrange it with Celsium.
- You pay the return freight to Celsium's warehouse in Illinois unless the sauna is defective or not as described, and a 25% restocking fee applies to the sauna's purchase price. On a freight item this size, please be confident before ordering.
- Refunds are issued after Celsium receives and inspects the sauna.
Questions about any of this? Contact us at support@motiontheorylabs.com before placing your order.
Our Shipping Policy
All orders ship via the method best suited to the size and weight of the product. Smaller items ship via standard parcel carriers. Large items such as saunas and fitness equipment ship via LTL freight and require a scheduled delivery appointment.
- Free shipping on every order in the Continental U.S. (excludes AK/HI), including freight delivery on large equipment. Nothing is added at checkout
- Freight deliveries are curbside unless otherwise noted
- You will be contacted to schedule a delivery appointment for freight orders
- Inspect all items carefully upon delivery before signing. Note any visible damage on the delivery receipt before the driver leaves — failure to note damage at delivery may affect your ability to file a claim
- For shipping questions, contact us at support@motiontheorylabs.com
Our Return Policy
We stand behind the products we carry and want you to be confident in every purchase.
- Most items are eligible for return within 30 days of delivery in original, unopened condition, less a 25% restocking fee
- Large freight items (saunas, fitness equipment) must be unopened and in original packaging to be eligible for return. A 25% restocking fee applies to all approved returns, and you pay return shipping, including freight. Once opened, they are not eligible for return or refund.
- Defective or damaged items are handled through the manufacturer warranty process — contact us at support@motiontheorylabs.com and we will assist
- Return shipping costs are the responsibility of the customer unless the item arrived damaged or defective
- For return requests, contact us at support@motiontheorylabs.com before sending anything back

















































































































































