Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove vs Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension

The Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove costs $1,765 and the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension costs $1,781. This comparison covers the full spec sheets of both, the deciding difference between them, and which buyer each one fits.

Prices verified August 2026

How we vet

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Our verdict

The choice between the Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove ($1,765) and the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension ($1,781) comes down to model. The Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove offers model of WP500, while the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension offers Pro 20 SL. The Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove saves you $16; pay the difference for the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension only if that gap buys a spec you will use.

Prices verified August 2026.

How we vet

Which one is right for you?

It depends on your situation.

Choose the Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove if

Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove: You want model of WP500. The Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove also costs $16 less than the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension.

Choose the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension if

Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension: You want model of Pro 20 SL.

Full specs comparison

Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove vs Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension full spec comparison
SpecHarvia Cauldron 50L WP500 Wood-Burning Sauna StoveHarvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension
Price$1,765$1,781
Type··
Heat Type··
Temp Range··
Heat-Up Time··
Capacity··
Dimensions··
Weight80 lbs154 lbs
EMF Level··
Power·24.1 KW
Warranty··

Pros and cons

Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove

Pros

    Cons

      Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension

      Pros

        Cons

          Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove vs Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension: common questions

          How much more does the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension cost than the Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove?

          The Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension costs $1,781, which is $16 more than the $1,765 Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove. Beyond price, the main spec difference is model: the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension offers model of Pro 20 SL, the Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove offers model of WP500.

          Is the Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove worth it over the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension?

          It depends on the spec you need, and we do not name one of these two better than the other. The Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove offers model of WP500, while the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension offers Pro 20 SL. The Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove costs $1,765 and the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension costs $1,781, a difference of $16.

          What is the main difference between the Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove and the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension?

          The Harvia Cauldron 50L WP500 Wood-Burning Sauna Stove offers model of WP500; the Harvia Pro 20 SL Wood-Burning Sauna Stove w/ Firebox Extension offers model of Pro 20 SL. That is the deciding spec difference between the two.

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