3 Alternatives to the Harvia Spirit SP90XW (Including Lower-Cost Portable Options)

The main thing to understand is that these alternatives are not direct like-for-like replacements. The Harvia Spirit SP90XW is a 9 kW electric sauna oven with Xenio WiFi control, designed to heat a fixed sauna room and deliver the intense, high-heat Finnish sauna experience. The alternatives listed here are portable infrared products, which are much cheaper and easier to use, but they work differently: they warm the body with infrared heat rather than heating a room to traditional sauna temperatures. That difference matters for comfort, installation, running costs, and the style of wellness experience you get.

LifePro Infrared Sauna Blanket For Relaxation, Detoxification & Rejuvenation | Infrared Therapy Portable Home Sauna | 25–80°C Adjustable Range With Handheld Controller & Storage Bag | Weight Loss — £359.99

This is the most budget-friendly way to get into at-home heat therapy, and at roughly £630 less than the Harvia, it is a completely different purchase category. The LifePro blanket is portable, folds away easily, and can be used in a flat, house, or even while travelling, which makes it far more practical than a fixed sauna oven that needs a proper sauna cabin, electrical installation, and room planning. It also gives you a wide temperature range from 25–80°C and a handheld controller, so it is simple to use without a smart control system.

The practical trade-off is obvious: you are not getting a true Finnish sauna. There is no heater output measured in kW, no sauna room heating, no stones, and no steam löyly. Instead, you get a personal infrared sweat session where the heat is concentrated around the body. That means it is far easier to install and much cheaper to run, but it will never replicate the communal, high-humidity, high-temperature ritual of a Harvia-powered sauna. Build quality is also naturally lighter-duty than a premium Finnish sauna oven. You are paying for portability and convenience rather than a long-life metal heater unit designed for a permanent sauna environment.

Who should choose it? This is best for someone who wants affordable, space-saving heat therapy and values convenience over authenticity. If your goal is relaxation, gentle detox-style sweating, or occasional recovery sessions without building a sauna room, the LifePro blanket makes sense. If you want a real sauna experience, this is not the substitute you want.

Firzone Portable Infrared Sauna Tourmaline Pro — £310.00

At £310, the Firzone Portable Infrared Sauna Tourmaline Pro undercuts the Harvia by about £680, making it one of the cheapest ways to create a home sauna-style routine. Like the LifePro, it is portable and infrared-based, so it avoids the cost and complexity of a fixed Finnish sauna heater. The practical benefit is that you can set it up quickly and store it away when not in use, which is ideal if you do not have a dedicated wellness room.

Compared with the Harvia Spirit SP90XW, the biggest difference is performance and permanence. The Harvia is a serious 9 kW oven built to heat a sauna room efficiently and consistently, with Xenio WiFi control adding modern convenience for scheduled use and remote management. The Firzone is much more basic in structure and output. It is not built to heat a large timber sauna cabin, and it won’t deliver the same dry heat intensity or the same thermal mass effect you get from a stone-based Finnish heater. In practical terms, that means a less immersive sweat, less dramatic temperature rise, and a more personal, contained experience.

Build quality is another key distinction. A Harvia heater is a premium, fixed installation product with the kind of engineering you expect from a proper sauna appliance: robust casing, high heat tolerance, and long-term durability. A portable infrared sauna is inherently less substantial because it has to remain lightweight and foldable. That does not mean it is poor quality, but it does mean it is designed around convenience and affordability rather than decades of heavy-duty use.

Who should choose it? The Firzone is a sensible pick if you want the lowest-cost route into home sauna use and you are happy with an infrared experience rather than a traditional sauna. It is especially attractive for first-time buyers, renters, or anyone who wants a personal wellness tool without committing to a fixed installation.

Smartmak Portable Infrared Sauna, 1 or 2 Person Large Space Infrared Sauna Tent, Full Size Personal Home Sauna Spa, with Upgraded Adjustable Folding Chair, Remote Control, LED Light — £294.99

The Smartmak is the cheapest option here, saving you about £695 compared with the Harvia. It is also the most sauna-like of the portable alternatives because it uses a tent format with room for one or two people, a folding chair, remote control, and LED light. For buyers who want a slightly more immersive at-home setup than a sauna blanket, this is the most appealing compromise between price and experience.

In practical terms, the tent design gives you more usable space than a blanket and a more enclosed feel, which can make sessions more comfortable and more like a real sauna routine. However, it still sits in a very different category from the Harvia Spirit SP90XW. The Harvia’s 9 kW output is built to heat a dedicated sauna room properly, while the Smartmak relies on infrared heat within a portable enclosure. That means the temperature profile is gentler, the heat distribution is less even, and the overall experience is less powerful. You also lose the premium control ecosystem of the Harvia Xenio WiFi setup, which is a genuine advantage if you want precise, modern control over a fixed sauna.

On build quality, the Smartmak is better suited to occasional domestic use than heavy daily use. The tent structure, chair, and accessories make it more versatile than a blanket, but it is still a lightweight portable product rather than a long-life sauna appliance. If you want something that feels more like a proper home spa setup without the cost and installation demands of a Finnish sauna oven, it is a strong middle ground.

Who should choose it? Choose the Smartmak if you want the best balance of price, space, and sauna-like feel among the portable options. It is a good choice for someone who wants a one- or two-person infrared routine at home and prefers a tent-style setup over lying inside a blanket. If you are comparing purely on practicality, it offers more everyday usability than the Firzone and a more traditional session format than the LifePro.

Overall, the alternatives here are best understood as different wellness tools rather than direct substitutes. The Harvia Spirit SP90XW remains the proper choice for anyone building or upgrading a real Finnish sauna and wanting premium performance, WiFi control, and long-term durability. The portable infrared products make sense when budget, space, and ease of use matter more than authenticity. If you are buying for a flat, renting, or simply want a lower-cost sweat session at home, the portable options are the more practical purchase — just be clear that you are trading away the full sauna experience.