Harvia Heaters Harvia Pro 20 SL Wood Burning Sauna Stove with Firebox Extension
Harvia Heaters Harvia Pro 20 SL Wood Burning Sauna Stove with Firebox Extension
Harvia Heaters Harvia Pro 20 SL Wood Burning Sauna Stove with Firebox Extension
Harvia Heaters Harvia Pro 20 SL Wood Burning Sauna Stove with Firebox Extension
  • Wood burning Stove
  • Stove door
  • Ash box
  • Installation and operation manual
  • 2-year warranty
Model Pro 20 SL
Kilowatt Rating 24.1kW
Primary Fuel Wood
Maximum Firewood Length 13.7" (350mm)
Diameter of Firewood 3 - 6" (80 - 150mm)
Minimum Cubic Feet 283 CF
Maximum Cubic Feet 706 CF
Minimum Room Height 81.1" (2060mm)
Heater Weight 154 lbs
Shipping Weight with Sauna Stones 242 lbs
Width 17" (430mm)
Depth 28.7" (730mm)
Height 30" (760mm)
  • Heats two rooms
  • Heater and fireplace
  • Wood-burning
  • 24.1kW
  • For sauna rooms from 283 to 706 cu. ft.
  • Requires a minimum of 88lbs of stones ( 2 boxes-AC3020)
  • cast-iron-framed glass door
  • Floor model
  • Upper connection opening
  • Rear connection opening
  • Soot opening
  • Designed, engineered, and made in Finland
  • Limited 2-year warranty 
  • Dimensions: 17" W (430mm) x 28.7" D (730mm) x 30" H (760mm)

The Harvia Pro 20 SL Wood Burning Sauna Stove with Firebox Extension is a Finnish-made floor model designed for sauna rooms from 283 to 706 cubic feet. With a 24.1kW wood-burning heater, fireplace-style firebox extension, cast-iron-framed glass door, and 88 lb stone capacity, it is a strong choice for sauna layouts where you want to feed the fire from outside the sauna room.

Best Uses for Harvia Pro 20 SL:

  • Best for larger sauna rooms from 283 to 706 cubic feet that need a 24.1kW wood-burning sauna heater.
  • Ideal for homeowners who want a heater and fireplace effect in one traditional sauna stove.
  • Well suited for cabin saunas, backyard saunas, and wellness spaces where wood heat is preferred.
  • Great for buyers who want a Finnish-made floor model with upper, rear, and soot openings for installation flexibility.
  • Best for sauna layouts where the firebox extension can heat the sauna while wood is loaded from another room.
  • A strong fit for shoppers who prefer a cast-iron-framed glass door and a limited 2-year warranty.

Yes, we really do offer FREE shipping! We will send your order at no additional cost to anywhere in the lower 48 states in the US. If you have questions about shipping to Alaska or Hawaii, please contact us through our live chat to discuss a custom freight quote.

Harvia Pro 20 SL Wood Burning Sauna Stove with Firebox Extension

$1,781.00 $1,978.89
You Save $197.89 (10% Off)

  • 24.1kW - For sauna rooms from 283 to 706 cu. ft.

  • 24.1kW - For sauna rooms from 283 to 706 cu. ft.

Quantity:
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Sauna Specialist
Exclusive Offer Talk to our Sauna Specialist to unlock an exclusive offer
  • Wood burning Stove
  • Stove door
  • Ash box
  • Installation and operation manual
  • 2-year warranty
Model Pro 20 SL
Kilowatt Rating 24.1kW
Primary Fuel Wood
Maximum Firewood Length 13.7" (350mm)
Diameter of Firewood 3 - 6" (80 - 150mm)
Minimum Cubic Feet 283 CF
Maximum Cubic Feet 706 CF
Minimum Room Height 81.1" (2060mm)
Heater Weight 154 lbs
Shipping Weight with Sauna Stones 242 lbs
Width 17" (430mm)
Depth 28.7" (730mm)
Height 30" (760mm)
  • Heats two rooms
  • Heater and fireplace
  • Wood-burning
  • 24.1kW
  • For sauna rooms from 283 to 706 cu. ft.
  • Requires a minimum of 88lbs of stones ( 2 boxes-AC3020)
  • cast-iron-framed glass door
  • Floor model
  • Upper connection opening
  • Rear connection opening
  • Soot opening
  • Designed, engineered, and made in Finland
  • Limited 2-year warranty 
  • Dimensions: 17" W (430mm) x 28.7" D (730mm) x 30" H (760mm)

The Harvia Pro 20 SL Wood Burning Sauna Stove with Firebox Extension is a Finnish-made floor model designed for sauna rooms from 283 to 706 cubic feet. With a 24.1kW wood-burning heater, fireplace-style firebox extension, cast-iron-framed glass door, and 88 lb stone capacity, it is a strong choice for sauna layouts where you want to feed the fire from outside the sauna room.

Best Uses for Harvia Pro 20 SL:

  • Best for larger sauna rooms from 283 to 706 cubic feet that need a 24.1kW wood-burning sauna heater.
  • Ideal for homeowners who want a heater and fireplace effect in one traditional sauna stove.
  • Well suited for cabin saunas, backyard saunas, and wellness spaces where wood heat is preferred.
  • Great for buyers who want a Finnish-made floor model with upper, rear, and soot openings for installation flexibility.
  • Best for sauna layouts where the firebox extension can heat the sauna while wood is loaded from another room.
  • A strong fit for shoppers who prefer a cast-iron-framed glass door and a limited 2-year warranty.

Yes, we really do offer FREE shipping! We will send your order at no additional cost to anywhere in the lower 48 states in the US. If you have questions about shipping to Alaska or Hawaii, please contact us through our live chat to discuss a custom freight quote.

Let customers speak for us

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We ordered the biggest heater (harvia spirit 8kw) and it heats up the sauna in about 15 mins inside our 40-50° garage. Overall this style of sauna is hotter and you sweat a lot faster than in an infrared sauna. I truly 10/10 recommend!
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Easy Assembly/great performance

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FAQ

GENERAL INQUIRIES

We are located in Indianapolis, Indiana.

Yes, we have some great financing options from our partner, Bread Pay. Just choose the monthly payment option at checkout to get started.

SHIPPING

Shipping in the Continental U.S. is free!

Since we carry different brands our products also ship from different locations.  See the list below:

  • Almost Heaven Saunas -  West Virginia
  • Dundalk Leisure Craft - Canada
  • Harvia - Portland
  • Baltic Leisure - Pennsylvania
  • Saunacore - Canada
  • TheraSauna- Iowa

The list below is the current delivery timeline by brand:

  • Almost Heaven Barrel Saunas - 6 to 8 Weeks
  • Almost Heaven Indoor Saunas - 4 to 6 Weeks
  • Amba Products - 1 to 2 weeks
  • Baltic Leisure - 3 to 4 weeks
  • Dundalk Leisure Craft -  Approximately 1 to 2 weeks after the estimated build date
  • Golden Designs Sauna - Within 1 week
  • Saunacore - 2 to 3 weeks
  • TheraSauna - 10 to 12 weeks

We currently do not ship to Alaska but if you are really interested we can request for a custom freight quote.

SAUNA ASSEMBLY

It is an easy assembly. Here is the link to our video gallery for a quick look.

The sauna comes in a crate. You'll need to assemble it but it is a very quick assembly.