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Narvi

Narvi Black 20 Through-the-Wall Wood-Burning Sauna Heater

£509.50

Price includes VAT where applicable. Delivery calculated at checkout.

Model: Narvi Black 20 ST Tunnel Model
Not included with this heater
  • Sauna stones — see the description for the quantity this heater needs
  • Flue or chimney kit

These are sold separately unless the option you choose says it includes them.

Available to order — contact us for the current lead time
Secure checkout
Freight delivery This item is too large or heavy for a parcel carrier and travels by freight or pallet service. Please contact us before ordering so that we can confirm the delivery arrangements, any delivery charge, the lead time and the access requirements for your address. Delivery information
14-day right to cancelChanged your mind? Tell us within 14 days of delivery. We cover reasonable return costs for faulty or incorrect items. Returns and refunds
Questions before you buy?Email support@brambleandbolt.shop or call +44 7848463927

Narvi Black 20 Through-the-Wall Wood-Burning Sauna Heater provides power, precision, and refined Finnish craftsmanship.  

Offering robust performance, enduring quality, and timeless elegance, the Narvi Black 20 through-the wall sauna heater is a masterclass in engineering. Its large stone compartment ensures optimal heat retention and a long, consistent "löyly," while the generously sized fire grate spans the full base of the heater, maximising combustion efficiency. Secondary air is carefully directed beneath the ash pan, further enhancing burn performance for cleaner, more efficient heating. 

The firebox is built for durability, with a 10 mm-thick stainless steel roof capable of withstanding years of intense use. The glazed cast-iron door not only showcases the warm glow of the fire but also helps maintain a steady flame, adding ambience to the adjacent room. 

With adjustable legs for effortless installation and a through-the-wall configuration, the Narvi Black 20 is conveniently loaded from outside the sauna, keeping your sauna clean and uncluttered while adding warmth to the adjoining space. 

For those seeking both substantial heating capacity and elegant Nordic design, the Narvi Black 20 is a refined yet powerful choice.  

Please note that the flue kit and sauna stones are to be purchased separately

We recommend the Kota Insulated Steel Flue / Chimney Kit.

This heater requires 60kg of sauna stones. We recommend using 10-15cm Olivine Diabase or Vulcanite Sauna Stones for optimal performance.

Warranty

The warranty on this Narvi Sauna Heater is 2 years in private use.

About Narvi Oy

Browse our wider Narvi sauna heater collection. 


Product Disclaimers

All Narvi sauna heaters are CE tested and bear the Finnish Key Flag Symbol. This is awarded to sauna heaters that are made and designed in Finland, where over 95% or more of the production must be within Finland itself. There are many brands that claim to be made in Finland but are actually made in the Far East or Russia and merely assembled or labeled in Finland.

Please note, we recommend that sauna heaters should be installed by a suitably qualified builder/plumber/fitter.

Complete your setup

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Before you buy

Questions before you buy

How much is delivery?

Standard UK delivery is £4.99, or free on orders of £50 or more. Express delivery is £6.99. The options available for your address, and their cost, are shown at checkout before you pay. See our delivery information.

Can I return my order?

You can cancel within 14 days of receiving your goods without giving a reason — please contact us before sending anything back. Faulty, damaged or incorrect items are covered by your rights under the Consumer Rights Act 2015. See our returns and refunds policy.

Do I need an electrician?

Yes for hard-wired equipment. Electric sauna heaters, steam generators, controllers and sauna lighting must be installed by a qualified electrician in line with BS 7671 and the manufacturer's instructions. Check the electrical requirements in the product description before ordering.

Which payment methods can I use?

Payment is taken through Shopify's secure checkout. The methods currently accepted are shown at checkout, including Apple Pay and Google Pay where your device supports them.

Is there a warranty?

Manufacturer warranties, where offered, are in addition to your statutory rights. Warranty length and terms vary by product and manufacturer — contact us if you need help identifying the warranty that applies.

Can I get advice before ordering?

Yes. Email support@brambleandbolt.shop or call +44 7848463927 with the product you are considering and details of your space, and we will help you check suitability, delivery access and anything else you might need.

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