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Harvia Vapour Barrier for Steel Chimney | WHM25

Silicone-rubber vapour barrier for the sauna-ceiling opening of Harvia's WHP1500 steel chimney: a 19.7 × 19.7 in sheet with an 8.07 in opening

Current price $300
Original price $399
Save $99
+ Free Shipping Free Delivery within the Continental US

In stock

Estimated delivery

7–12 days after you order

*Eligible returns must be requested within 30 days of delivery. Restocking and freight charges apply, and some items are final sale. See the Refund Policy.

Description

What is the Harvia WHM25 vapour barrier?

The Harvia WHM25 is a silicone-rubber vapour barrier for the ceiling opening of the Harvia WHP1500 steel chimney: a 19.7" × 19.7" (500 × 500 mm) sheet with an 8.07" (205 mm) opening that fits around the insulated chimney where it passes through the sauna ceiling. Harvia's WHP1500 manual lists it as the chimney's silicone-rubber vapour barrier.

Which chimney does the Harvia WHM25 fit?

The Harvia WHM25 fits the Harvia WHP1500 chimney kit in stainless steel or black, whose insulated chimney is 8.66" (220 mm) across. The kit does not include a vapour barrier, so the WHM25 is sold separately. Harvia's WHP1500 manual says a silicone vapour collar on a sauna ceiling must withstand at least 320°F (160°C) continuously.

What's Included

What's in the box with the Harvia WHM25?

  • Harvia WHM25 silicone-rubber vapour barrier, 19.7" × 19.7" (500 × 500 mm)

What you need separately

  • The Harvia WHP1500 or WHP1500M steel chimney kit, which the vapour barrier fits around
Specifications

Harvia WHM25 specifications

Harvia WHM25 (Harvia instructions Y05-1287 09/25; WHP1500 manual Y05-0100 10/25)
Material Silicone rubber
Size 19.7" × 19.7" (500 × 500 mm)
Opening 8.07" (205 mm)
Fits Harvia WHP1500 and WHP1500M steel chimneys, 8.66" (220 mm) across
Position At the sauna ceiling, around the insulated chimney
Net weight 1.1 lb (0.5 kg)
Harvia part number WHM25 (GTIN 6417659019040)
Warranty 2-year manufacturer warranty

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What Topture Customers Say

Topture is rated 4.9/5 across 463 customer reviews

We thought about buying a sauna for years and finally did. We absolutely love it, especially in the winter. It’s incredibly easy to assemble with two people the whole family uses it.

Verified buyer

Ordered this sauna fall 2024 and we love it. No better feeling during a Minnesota winter. Lastly, I have to mention the customer service for this purchase has been like no other. Any questions or requests I had were addressed immediately by Topture. I got more than I expected from them and have already recommended them to several people looking for saunas. SO if you're thinking about it, JUST DO IT already..

Verified buyer

Thanks for the great service - greatly appreciated.

Verified buyer
463 Customer Reviews

Product and store reviews from Topture customers, collected by Judge.me.

Lifetime Expert Support

Same team before and after the sale, from sizing to warranty support.

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Sold by Topture, with the applicable manufacturer warranty.

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Freight damage? We help coordinate the claim and replacement process.

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Frequently Asked Questions

General Topture Questions

Where are you located, and where do you ship from?

Topture is an online retailer serving customers in the contiguous United States. The company is Topture LLC, a Wyoming limited liability company, and its registered business address is 30 N Gould St, Ste N, Sheridan, WY 82801.

Orders ship from manufacturer and distributor warehouses in the U.S. and Canada, and some products ship directly from the manufacturer in Europe. Each product page shows its estimated delivery time.

How much is shipping?

Orders over $200 ship free within the continental United States. Orders under $200 carry a small shipping fee.

Two exceptions: SaunaLife and ThermaSol products carry a freight charge at any order value, and sauna stones ordered without a heater ship at $60 per box because of their weight.

Every charge is shown at checkout before you pay.

Do you provide financing?

Absolutely! To view your financing offer, simply select Shop Pay Installments as your payment method at Step 3 of checkout.

You'll need to enter a debit card to receive your offer, but don’t worry—you can still back out before completing the purchase.

How long will it take for my items to arrive?

If your order is in stock, most orders ship within 2–7 business days of purchase. Transit time then depends on the distance from the warehouse and, for freight, on booking a delivery appointment.

For custom, pre-order or made-to-order items, the estimated delivery time frame is listed on the product page. Delivery dates are estimates, so please don't book installation labor until your order has arrived and been inspected.

What happens after I place my order?

As soon as you place your order, you'll receive a confirmation email with your order details—be sure to keep it for your records. Once your order ships, you'll receive another email with tracking information.

For freight deliveries, the carrier will call or text you to schedule an appointment once the shipment reaches their local terminal. Someone needs to be there to inspect the shipment and sign for it. Smaller parcels arrive by UPS or FedEx without an appointment.

Is there a warranty?

Yes. Products purchased through Topture include the applicable manufacturer’s warranty, subject to the manufacturer’s terms. You’ll find the warranty details for each product under the "Warranty" tab on its product page, and we help with troubleshooting and warranty coordination if an issue comes up.

Do you have a showroom?

We don’t have a showroom — we sell online. Our team is available by phone, email and chat to help you compare models, sizes and heaters, and we can send dimensions, installation manuals and electrical requirements before you buy.

Where do you deliver to?

We deliver throughout the 48 contiguous states, with curbside freight delivery for large items. Free shipping and standard rates apply there only. Alaska, Hawaii, Puerto Rico, other U.S. islands and Canada are quoted separately, depending on the brand and model. We can't ship freight or oversized items to P.O. boxes.

Do you ship internationally?

International Shipping

For many products, yes, including to Canada, by custom quote. Email contact@topture.com with the product and your address before you order; availability and cost depend on the brand and model. Any duties, taxes and customs fees are your responsibility.

Shipping to Hawaii, Alaska, and Puerto Rico

Free shipping applies to the continental United States only. Shipping to Alaska, Hawaii, Puerto Rico and other U.S. islands is quoted separately and depends on the brand and model. Email contact@topture.com for a quote before you order.

Your sauna chimney component, done the right way.

*Eligible returns must be requested within 30 days of delivery. Restocking and freight charges apply, and some items are final sale. See the Refund Policy.