Harvia WHP-AS Chimney Roof Accessory Kit for Tilted Roofs, Stainless Steel

The Harvia WHP-AS tilted roof accessory kit contains everything needed to take a Harvia steel chimney through a pitched (tilted) roof: rain cap, tilted rain flange with clamp, smoke pipe, lead-through flange, and lead-through insulation with protector. The stainless steel finish matches Harvia’s stainless chimney modules.

Features

• Complete lead-through and weatherproofing kit for pitched roofs
• Tilted rubber rain flange seals against sliding rain and snow
• High-quality stainless steel components
• Pairs with Harvia WHP chimney modules (115 mm smoke path)
• Limited 2-year warranty (consumer use); limited 1-year warranty (commercial use)

What’s Included

• Rain cap
• Tilted rain flange
• Rain flange clamp
• Smoke pipe
• Lead-through flange
• Lead-through insulation and protector

Specifications

Compatibility

Use with Harvia WHP steel chimney modules such as the WHP1000500 chimney or the WHP1500 kit components. For flat roofs and barrel saunas, choose the symmetric kit (WHP-ASSYM) instead.

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

Tilted or symmetric kit — which one do I need?

Pick the tilted kit (WHP-AS) for a pitched roof; its angled rain flange conforms to the slope. The symmetric kit (WHP-ASSYM) is for flat roofs and barrel saunas with a flat roof plate.

How is the rain flange installed?

Harvia specifies silicone sealant beneath the flange, roof screws spaced no more than 35 mm apart, and a fully tightened clamp with no sealing gaps. Where sliding snow can load the flashing, add a snow barrier above the chimney.

Does the kit include the insulated chimney itself?

No — this is the roof accessory set only. Combine it with a Harvia WHP insulated chimney module to complete the system.

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)
• 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 (this page)
• 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)