Harvia WZ Smoke Pipe, 115mm, for Wood-Burning Sauna Stoves (20cm, 50cm, 1m)

Harvia WZ smoke pipes are the non-insulated 115 mm (4.5″) connector pipes that join a Harvia wood-burning sauna stove to its chimney. They are CE certified, soot-fire resistant, and available in stainless steel or black powder-coated steel in three lengths — 20 cm, 50 cm, and 1 m — so you can bridge exactly the distance between the stove collar and the insulated chimney or lead-through.

Features

• Standard Harvia 115 mm (4.5″) smoke path
• CE certification — complies with fire and operational safety requirements
• Soot-fire resistant steel construction
• Stainless steel or black powder-coated finishes
• Compatible with all Harvia wood-burning sauna stoves except the Harvia 50 (the 20 cm pipe also fits the Harvia 10)
• Limited 2-year warranty (consumer use); limited 1-year warranty (commercial use)

What’s Included

• One smoke pipe in the selected length and finish

Specifications

Compatibility

Connects Harvia wood-burning stoves (115 mm outlet) to the Harvia WHP1500 chimney kit or a masonry flue. Remember that non-insulated smoke pipe requires a much larger clearance to combustibles than the insulated chimney — 500 mm for stainless and 375 mm for black pipe unless shielded. Transitioning to a 6″ US Class A chimney? Use the Harvia WZ115155 adapter, also available at Sauna Marketplace.

Planning note: Harvia’s WHP steel chimney system installs vertically only and is designed for wood-burning sauna stoves in standalone outdoor sauna buildings. Keep at least 4″ (100 mm) of clearance between the insulated outer casing and any combustible material, and confirm your installation with your local building authority before you build.

Good to Know

Which smoke pipe length do I need?

Measure from the stove’s smoke outlet to where the insulated chimney or ceiling lead-through begins. Harvia’s slot-and-lock connection lets pipes combine, and the smoke pipe can be cut to length while keeping a proper overlap at each joint.

What is the clearance to combustible materials?

Per Harvia’s manual, non-insulated stainless smoke pipe needs 500 mm (19.7″) of clearance and black smoke pipe needs 375 mm (14.8″), unless protective shielding is used. The insulated chimney above it needs only 100 mm (4″).

Will these pipes fit a non-Harvia stove?

They are built for Harvia’s 115 mm smoke outlet. Many European sauna stoves share this size, but always verify your stove’s outlet diameter before ordering; US stoves typically use 6″ pipe instead.

Designing a Harvia Chimney System

Every part on this page belongs to Harvia’s modular WHP steel chimney system: a 115 mm (4.5″) smoke path inside a 220 mm (8.6″) insulated casing, assembled with slot-and-lock joints. Here is how a complete system comes together:

1. Start with the chimney. For pitched roofs, the WHP1500 kit (1500 mm chimney plus rain cap, tilted rain flange, smoke pipe, and ceiling lead-through set) is the core of the system. For flat roofs and barrel saunas, the WHP1000500 package bundles the chimney with the symmetric roof kit.
2. Connect the stove. Bridge the stove collar to the insulated chimney with 115 mm WZ smoke pipes (20 cm, 50 cm, or 1 m). Add the WZ115030SP damper plate at the stove to control draft while firing, a WZ115120 reducer where pipe sections step down, or the WZ115155 adapter if you are transitioning to 6″ US Class A pipe.
3. Reach your height. Add WHP500 (500 mm) or WHP1000 (1000 mm) extensions. Stay within Harvia’s limits: 5.0 m (16.4 ft) total chimney height, no more than 2.0 m (6.5 ft) above the last support, lateral supports every 3.0 m (9.8 ft).
4. Go through the roof. Choose the roof kit that matches your roofline — WHP-AS for tilted/pitched roofs, WHP-ASSYM for flat roofs and barrels. Replacement rain collars: WHM22 (tilted) and WHM24 (symmetric). Add a snow barrier above the chimney where sliding snow can load the flashing.
5. Seal and control. The WHM25 vapor barrier restores the vapor-tight layer where the chimney passes the sauna ceiling; the WHP270 insulated damper closes the flue after the fire is fully out so the sauna holds its heat.
6. Finish the stove side. Stone-filled covers — WL300 for Legend stoves, WL300PC for Cilindro — absorb radiant heat from the smoke pipe and significantly reduce its required safety distances.

Key clearances and rules: vertical installation only; 100 mm (4″) from the insulated casing to combustibles; 500 mm (stainless) or 375 mm (black) from non-insulated smoke pipe unless shielded; designed for wood-burning stoves in standalone outdoor sauna buildings. Confirm your plan with your local building authority — and if you would like help speccing the system, talk to us; we design these daily.

Shop the Complete Harvia Chimney System

1. Start with the chimney

• WHP1500 Chimney Kit, 1500mm (stainless or black) — the system core
• WHP1000500 Complete Chimney Package for flat roofs & barrel saunas

2. Connect the stove

• WZ Smoke Pipes, 115mm (20 cm / 50 cm / 1 m, stainless or black) (this page)
• WZ115030SP Stove-Side Damper Plate (draft control while firing)
• WZ115120 Reducing Pipe (joins mismatched pipe sections)
• WZ115155 Adapter, 4.5″ Euro to 6″ USA (hybrid Class A transitions)

3. Reach your height

• WHP500 Chimney Extension, 500mm
• WHP1000 Chimney Extension, 1000mm

4. Go through the roof

• WHP-AS Roof Accessory Kit for tilted / pitched roofs
• WHP-ASSYM Roof Accessory Kit for flat roofs & barrel saunas
• WHM22 Replacement Rain Collar, tilted roofs
• WHM24 Replacement Rain Collar, flat roofs & barrels

5. Seal and control

• WHM25 Chimney Vapor Barrier (seals the ceiling penetration)
• WHP270 Insulated Smoke Damper (retains heat after firing)

6. Finish the stove side

• WL300 Smoke Pipe Cover for Legend stoves (cuts clearances)
• WL300PC Chimney Cover for Cilindro stoves (cuts clearances)