Holl’s Moon 4 — 4 Person Circular Indoor Infrared Sauna
A generous circular infrared sauna for up to four
The Holl’s Moon 4 expands the distinctive circular Moon design into a more social four-person cabin. Its curved frontage and broad glass door create an open architectural presence, making it a natural focal point for a substantial home wellness room, private gym or considered hospitality setting. The additional internal space supports shared use without losing the calm material character that defines the range.
At a glance: four-person capacity, Ø180 × H196cm external dimensions, 4,620W total infrared output, four Quartz Full Spectrum emitters, twelve carbon panels, 220–240V supply and a choice of Natural Wood or Deep Black.
Natural warmth or a darker statement
Natural Wood
The Natural Wood finish foregrounds the grain of the FSC-certified Grade A hemlock cabin. Its warm, light appearance sits comfortably with stone, pale timber, textured plaster and other natural materials. Inside, the bench and contact surfaces are formed in abachi, selected for a smooth tactile finish within the sauna environment.
Deep Black
Deep Black gives the larger Moon 4 a confident, sculptural identity. The dark slatted exterior and tinted safety-glass door suit high-contrast interiors, contemporary gyms and wellness rooms where the cabin is designed to anchor the scheme. The listed capacity and core infrared specification are shared by both finishes; the choice determines the visual relationship between the sauna and its surroundings.
Full Spectrum and carbon infrared system
Four Quartz Full Spectrum emitters work with twelve carbon infrared panels to provide broad coverage around the larger cabin. The manufacturer lists a total infrared output of 4,620W and represents IR-A, IR-B and IR-C wavelengths within the Full Spectrum system. The arrangement is designed to deliver radiant warmth across the four seated positions.
Infrared heat is a different experience from a traditional Finnish sauna: the cabin uses radiant emitters rather than a stove and hot stones, and water must not be applied as though it were a conventional heater. User comfort and appropriate session length are individual. Follow the current manufacturer instructions, remain hydrated and take professional advice before sauna use if a medical condition, pregnancy or medication may be relevant.
Control and ambience for a larger cabin
The Moon 4 is equipped with a seven-inch colour touchscreen, providing a larger interface for the principal controls. Integrated Bluetooth audio allows music or guided content to become part of the session. Ambient LED lighting and chromotherapy settings bring adjustable colour and atmosphere to the curved interior.
The curved eight-millimetre tempered safety-glass door preserves the light, open quality of the design while creating a clear and generous entrance into the cabin.
Moon 4 specification
- Capacity: four seated people
- External dimensions: Ø180 × H196cm
- Total infrared output: 4,620W
- Infrared system: four Quartz Full Spectrum emitters and twelve carbon panels
- Wavelengths: IR-A, IR-B and IR-C
- Electrical supply: 220–240V
- Cabin: FSC-certified Grade A hemlock
- Interior and bench: abachi
- Door: curved 8mm tempered safety glass
- Controls: seven-inch colour touchscreen
- Features: Bluetooth audio and ambient LED lighting/chromotherapy
- Location: indoor use only
Technical planning is essential
The Moon 4 is an indoor-only product and must stand in a dry, ventilated room on a level, stable and load-bearing floor. Its 180cm diameter also makes delivery-route measurement, doorway access, assembly space and operating clearances important early design decisions. These points should be reviewed against the current installation manual before an order is finalised.
The sauna is listed for a 220–240V supply and has a substantially higher connected load than Moon 1 or Moon 2. A qualified electrician must assess the proposed location and confirm the connection method, circuit capacity, isolation, protection and any preparatory work required. No existing domestic socket or circuit should be assumed suitable.
Specialist pallet delivery and optional installation can be scoped around the property. Current supplier stock, lead time, access, unloading, positioning, assembly and electrical responsibilities are recorded in the written KeiCo quotation before delivery.
Designed as part of a complete wellness project
KeiCo can coordinate the Moon 4 with the broader room: finishes, floor build-up, lighting, circulation, storage and the relationship with showers, cold therapy and relaxation areas. This project-led approach is particularly valuable for the larger cabin, where technical planning and the surrounding user journey have a meaningful effect on the final experience.
The manufacturer lists a ten-year warranty for the wood and a two-year warranty for electrical components, subject to its current terms, correct installation and intended use. Optional KeiCo Care™ support can also be considered, with its scope and cost clearly set out in your quotation.
Planning a shared wellness space? Choose Natural Wood or Deep Black and request a KeiCo consultation. We will confirm current specification, pricing, availability, access, electrical provision and installation scope before your Moon 4 order is placed.
FAQ's
How many people can the Holl’s Moon 4 seat, and how large is it?
The Holl’s Moon 4 is designed for 4 seated people. Its external dimensions are Ø180 × H196cm. Check the complete access route, room dimensions and manufacturer-required clearances before ordering.
What infrared heating does the Moon 4 use?
It combines four Quartz Full Spectrum emitters with twelve carbon infrared panels, representing IR-A, IR-B and IR-C wavelengths within the manufacturer’s system. The listed total infrared output is 4,620W.
Can the Moon 4 be installed outdoors?
No. The Moon 4 is an indoor-only sauna. It requires a dry, ventilated room, a level load-bearing floor and the clearances stated in the current Holl’s installation manual.
What electrical supply and installation does the Moon 4 need?
The listed supply is 220–240V. A qualified electrician must confirm the connection method, circuit protection, isolation and any preparatory work against the current Holl’s manual. No existing socket or circuit should be assumed suitable.
What is the difference between Natural Wood and Deep Black?
The listed core Moon 4 specification is the same in both finishes. Natural Wood showcases the hemlock grain; Deep Black uses a dark exterior treatment and tinted glass for a more graphic appearance. Screen colours and natural timber grain can vary from imagery.
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