Harvia WHP1000M is the 1000 mm / about 39-3/8" insulated extension for the Harvia WHP1500M steel chimney. Black powder-coated steel. You only need this if the 1.5 m kit is short for the roof. Harvia’s joint screws the sections together so heat expansion does not walk the pipe.
How it is used
Stack on the WHP1500M insulated chimney, same black family. Harvia: indoor unsupported height up to 3 m; outdoor self-supported height 2 m; total chimney not over 5.0 m. The installer sets bracing from the manual — we do not guess wind load.
What’s included
- One WHP1000M insulated chimney extension (1000 mm / about 39-3/8")
- For use only with Harvia WHP1500M steel chimney (Harvia: may only be installed with WHP1500 / WHP1500M)
Specs
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Brand: Harvia (Finland)
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Model: WHP1000M
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Finish: Black powder-coated steel
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Height: 1000 mm / about 39-3/8"
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Outer casing: 220 mm / about 8.66"
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Fits: Harvia WHP1500M steel chimney only
Downloads
Code, UL, and who decides the flue
A licensed chimney installer and the authority having jurisdiction decide the flue for your building. We sell the manufacturer’s European steel chimney system named on this page. Harvia prints CE on the pages we cite. Those pages do not print a UL listing. We will not invent one. This is not a US 6-inch Class A kit.
Harvia WHP1000M. Extension only — not a complete flue. Still not UL, still not 6-inch Class A.
Email hello@selfcaresaunas.com with roof type (flat vs pitched), ceiling height, and whether the stove loads from inside or through the wall — before you order pipe.
FAQ
Is this a US 6-inch Class A chimney?
No. Harvia’s WHP steel chimney is a European modular flue: inner smoke pipe 115 mm (about 4.53"), outer casing 220 mm (about 8.66"). Harvia.com prints CE. We do not invent UL. Your installer and local code decide whether this system is legal on your building.
Indoor house chimney?
Harvia’s own support page for WHP1500: suitable only for standalone outdoor sauna buildings — not as the chimney for a fireplace inside a house or vacation home. If the sauna is inside a dwelling, stop and email hello@selfcaresaunas.com.
Does the kit include a damper?
No. Harvia names WHP270SP (stainless) and WHP270SPM (black) as the matching dampers, sold separately.
Vertical only?
Harvia’s WHP steel chimney manual: vertical only. Total insulated height max 5.0 m with extensions. Indoor unsupported and outdoor self-supported heights are in that manual.
Do I need the full kit first?
Yes. Harvia: extensions mount only with the WHP1500 / WHP1500M steel chimney. Match stainless with stainless, black with black.
Questions? Email hello@selfcaresaunas.com or email hello@selfcaresaunas.com.
