Narvi Ultra Big - Stainless Steel - Commercial Electric Sauna Heater

Designed for large commercial saunas.

Product Description

The Narvi Ultra Big large commercial electric sauna heater is ideal electric heaters for large commercial saunas fitted in gyms, spas, hotels and wellness retreats. These heaters can also be fitted in large personal or group saunas. They are the perfect choice for demanding usage requirements, such as being active all day, every day. The Ultra Big is a truly unique, one-of-a-kind commercial heater. No other sauna heater on the market combines the authentic Finnish sauna experience that comes with such a large stone capacity, with such an outstanding build quality and durability. When it comes to heating large authentic commercial saunas, there is no better option that the Narvi Ultra Big.

The Ultra Big is a larger version of the Narvi Ultra and similarly is stainless steel inside and out, with some of the highest material thicknesses on the market. The elements have a market leading thickness and grade, making this the ideal heater for frequent use where water can and should be poured over the stones.

It is certainly true that there are sauna heaters and there are sauna heaters. This is also very much the case for commercial heaters. Most modern hidden/behind-the-bench heaters and commercial heaters simply act as a heater with no stones. This creates an unpleasant löyly and is nothing like the very relaxing and enjoyable experience of authentic Finnish sauna. Sadly however, this is the experience that many of the British public attribute to sauna from their brief encounter with their local health club. This heater will set your sauna apart from the competition by being one of the few truly authentic Finnish electric sauna heaters in the U.K.

The Ultra Big series combines Narvi's renowned build quality and longevity with their market leading stone capacity to provide a commercial heater that is simply like no other on the market. Show your customers what it means to relax and enjoy a true Finnish sauna, with a genuine Finish-made, Finnish-designed commercial sauna heater.

The sauna heater is controlled from a separate control panel that can be installed where required. 

Control panel C-2003 for use with the Narvi Ultra Big.

- Heater temperature control 40°C - 115°C (in 1°C steps)
- Temperature display 20°C - 125°C
- 14 memory locations for switch on time (2 times a day)
- The programmed switching-on time can be bypassed
- Switching-on time 6h, 12h, 18h or continuous time
- Control for sauna room lights
- External temperature sensor for sauna room
- Same timer as weekly timer, but two settings/day possible

There is also a thermostat unit, separate from the control panel that ensures that the sauna is kept at the desired temperature. The Ultra Big Control panel C-2003 can be purchased with the heater and is also sold separately. The Narvi Ultra Big Power Supply Unit is to be purchased separately too.

Product Specification

* Minimum distances to combustible materials.

Warranty

The warranty on this Narvi Sauna Heater is 2 years. The heating elements have a 6-month warranty.

About Narvi Oy

You can browse our wider Narvi collection here. 

Product Disclaimers

All Narvi commercial 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. Watch out for these symbols as a mark of an authentic, Finnish-made, safe, quality product:

As part of Finnmark Sauna's Endurance Ethos, we only deal in products that are market leaders in quality. We commit ourselves to search exhaustively for the highest quality authentic Finnish sauna products.

Please note, we recommend that electric sauna heaters should be installed by a suitably qualified electrician/builder/fitter. Finnmark Limited accepts no liability for loss or injury caused by the incorrect installation of your sauna heater. Please Contact Us if you require information on our recommended fitters.

Please note: All of our Narvi commercial electric heaters above 12kW are made to order, so once you receive an order confirmation from us, Narvi will start to custom-produce your heater(s) for you in Finland, and your order cannot be cancelled or returned any longer. We suggest that you make sure your design specifications and all necessary electrical and wood-burning provisions are finalised and confirmed with your designers, architect, engineers and electricians before placing your order with us.

Christmas and New Year's Delivery Notice

Please note the following changes to our pallet shipping and DPD delivery service on parcel orders over the Christmas period.

Our warehouse is fully closed for operation over the following days: Wednesday 24 December, Thursday 25 December, Friday 26 December, Wednesday 31 December and Thursday 1 January.

Orders requiring a pallet

The last dispatch date for orders requiring a pallet is Friday 19th December 2025. Pallet orders dispatched on this day must be booked and signed for with one of our sales team representatives latest by close of business on Friday 19th December 2025.

Please note:

• Pallets dispatched on 19th December will be delivered on either 22nd or 23rd December, depending on your postcode
• We strongly advise against booking deliveries to the Highlands or Channel Islands close to the 19th December, as these may be held at the hub over the festive period
• There may be limited availability for pallet shipping on this day and we cannot guarantee that available slots remain

We will commence our regular pallet shipping service on Monday 5th January 2026.

If you have any questions about your pallet order, please get in touch with our Sales team: +44 (0) 20 8050 2895 or email info@finnmarksauna.com

Small Parcel Orders

DPD will deliver as normal up to and including Tuesday 23rd December 2025. Orders for next day delivery must be placed latest by 3pm.

Limited dispatch service: We will dispatch DPD orders on Monday 29th December and Tuesday 30th December only during the festive closure period.

We will commence our regular delivery service on Monday 5th January 2026.

*Estimated delivery times are applicable to the UK mainland only (excludes Highlands and Islands). Additional delays and charges will be required for Non-UK Mainland and Highlands and Islands deliveries.