Kohler C1 vs. C2 Sauna Guide: Indoor vs. Outdoor, Sizes & Pricing (2026)
Kohler is one of the most trusted names in home wellness, and as an authorized Kohler dealer, we get asked the same question almost every week: what's the actual difference between the C1 and the C2? It sounds like a simple size question, but it isn't — one is built for inside your home, the other for your backyard, and the two lines don't overlap. This guide breaks down every size, finish, and pricing configuration across both lines, plus what installation, space, and flooring actually require before you buy.
In This Guide
- C1 vs C2: The Core Difference
- Kohler C1 vs C2 Comparison Chart
- Kohler C1 Indoor Sauna — Sizes, Finishes & Pricing
- Kohler C2 Outdoor Sauna — Sizes, Finishes & Pricing
- Installation: What Each Model Actually Requires
- Size & Space Planning
- Shipping & Delivery: What to Expect
- Flooring: Why It Only Applies to the C1
- Which Kohler Sauna Is Right for You
- Frequently Asked Questions
Quick Answer
Have interior space and want the lowest entry price: Kohler C1 2-Person in Scandinavian Spruce ($15,412.50).
Want the finished, matching interior look: Kohler C1 with the floor kit added — any size, either finish.
Building a backyard wellness space for the family: Kohler C2 5-Person in Douglas Fir ($38,062.50).
Want the darker, more modern look: Graphite Grey (C1) or Weathered Grey Spruce (C2) — both cost more than the standard wood finish.
C1 vs C2: The Core Difference
Every Kohler home sauna sold through Collective Relaxation falls into one of two families — and the split isn't about size or style, it's about where the sauna lives.
The C1 is Kohler's indoor sauna line. It's built for installation inside a home — a bathroom, home gym, basement, or dedicated wellness room — and comes with both freestanding and alcove installation options. The C2 is Kohler's outdoor sauna line, engineered for backyard placement with weatherproofing, a lockable protective cover, and roof eaves that most indoor units simply don't need.
The rule of thumb: There is no dual-purpose Kohler model. If you're deciding between the two, the first question isn't "which is better" — it's "where is this sauna actually going to sit." That answer picks the line for you before price or finish ever enters the conversation.
Kohler C1 vs C2 Comparison Chart
| Feature | Kohler C1 (Indoor) | Kohler C2 (Outdoor) |
|---|---|---|
| Installation location | Indoors only | Outdoors only |
| Sizes available | 2, 3, 5-Person | 3, 5, 6-Person |
| Finish options | Scandinavian Spruce, Graphite Grey | Douglas Fir, Weathered Grey Spruce |
| Installation styles | Freestanding or alcove | Freestanding only |
| Flooring option | With Floor or Without Floor | Not applicable — ships complete |
| Weatherproofing | Not required | Lockable cover, roof eaves, Aerotherm ventilation |
| Starting price | $15,412.50 | $33,656.25 |
| Heater | FERO freestanding electric | FERO freestanding electric |
| Warranty | 5-Year Limited | 5-Year Limited |
🪵 Kohler C1 Indoor Sauna — Sizes, Finishes & Pricing
The C1 is built for interior spaces and comes in three capacities. Every size is available in two finishes and can be ordered with or without a matching floor kit, with professional installation as an optional add-on.
Lowest Entry PriceKohler C1 in Scandinavian Spruce
The Kohler C1 in its standard Scandinavian Spruce finish.
From $15,412.50
The Scandinavian Spruce finish is the C1's standard, natural-wood look — light, warm, and traditional. It uses the same obeche wood bench, tempered glass, and FERO freestanding heater as the Graphite Grey version, just without the darker exterior treatment.
| Size | No Floor / No Install | No Floor / With Install | With Floor / No Install | With Floor / With Install |
|---|---|---|---|---|
| 2-Person | $15,412.50 | $17,662.50 | $16,068.75 | $18,318.75 |
| 3-Person | $17,381.25 | $19,631.25 | $18,281.25 | $20,531.25 |
| 5-Person | $20,456.25 | $22,706.25 | $21,487.50 | $23,737.50 |
Shop the Kohler C1 in Scandinavian Spruce →
Modern FinishKohler C1 in Graphite Grey
The Kohler C1 in the darker, contemporary Graphite Grey finish.
From $17,156.25
Graphite Grey swaps the exterior wood tone for a darker, more contemporary finish — everything else about the sauna, including the interior spruce, bench, and heater system, is identical to the Scandinavian Spruce version.
| Size | No Floor / No Install | No Floor / With Install | With Floor / No Install | With Floor / With Install |
|---|---|---|---|---|
| 2-Person | $17,156.25 | $19,406.25 | $17,812.50 | $20,062.50 |
| 3-Person | $20,025.00 | $22,275.00 | $20,925.00 | $23,175.00 |
| 5-Person | $23,118.75 | $25,368.75 | $24,150.00 | $26,400.00 |
Shop the Kohler C1 in Graphite Grey →
🌲 Kohler C2 Outdoor Sauna — Sizes, Finishes & Pricing
The C2 is Kohler's backyard sauna, built to handle weather year-round. Unlike the C1, there's no flooring decision to make — it ships as a complete freestanding unit — so pricing only splits by size, finish, and whether you want installation included.
Best Value Outdoor FinishKohler C2 in Douglas Fir
The Kohler C2 outdoor sauna in Douglas Fir, with Aerotherm ventilation and weather-protective roof eaves.
From $33,656.25
Douglas Fir is the C2's standard exterior — a warm, natural wood tone built to weather outdoors. It carries the same construction, insulation, and heater as the Weathered Grey Spruce version at a lower price point.
| Size | Without Installation | With Installation |
|---|---|---|
| Up to 3 People | $33,656.25 | $39,956.25 |
| Up to 5 People | $38,062.50 | $44,362.50 |
| Up to 6 People | $42,562.50 | $48,862.50 |
Shop the Kohler C2 in Douglas Fir →
Modern Outdoor FinishKohler C2 in Weathered Grey Spruce
The Kohler C2 in Weathered Grey Spruce, installed and ready for use.
From $34,762.50
Weathered Grey Spruce gives the C2 a cooler, more contemporary exterior tone — a popular pairing with modern decks, stone patios, and darker outdoor palettes.
| Size | Without Installation | With Installation |
|---|---|---|
| Up to 3 People | $34,762.50 | $41,062.50 |
| Up to 5 People | $39,487.50 | $45,787.50 |
| Up to 6 People | $44,006.25 | $50,306.25 |
Shop the Kohler C2 in Weathered Grey Spruce →
Installation: What Each Model Actually Requires
C1 Indoor Installation
The C1 can be installed one of two ways:
- Freestanding — the sauna sits as a standalone cabin inside a room, with clearance on all sides for ventilation and access to the external control panel.
- Alcove — the sauna is built into a recessed space (like a converted closet or bump-out), using existing walls on one or more sides. This saves floor space but requires the alcove to match the unit's exact dimensions.
Every C1 requires a dedicated electrical circuit for the FERO heater — this is not a standard household outlet, and most installations need an electrician to run a new line even if you skip Kohler's professional install add-on. Ceiling height and doorway clearance for delivery are the two most common issues buyers overlook.
C2 Outdoor Installation
The C2 is freestanding-only — there's no alcove option since it's designed to stand alone in a yard. Installation considerations are different from indoor units:
- A level, stable base is required — concrete pad, paver base, or reinforced deck section
- Electrical run from the house to the sauna location, sized for the FERO heater's draw — almost always a job for a licensed electrician regardless of the installation add-on
- Clearance from fences, structures, and combustible materials per local code
- Roof eaves and the lockable cover are already built in, so no separate weatherproofing structure is needed
Important: The "With Installation" price tier on both models covers professional on-site assembly and placement — it does not typically include the electrical trenching or wiring from your home's panel, which is usually quoted separately by a local electrician.
Size & Space Planning
Kohler's person-capacity ratings assume average adult body size at comfortable, not maximum-packed, seating — plan for slightly less real-world capacity than the label if your household runs larger.
C2 Outdoor Cabin Dimensions
| Capacity | Nominal Size (W x D x H) | Actual Size (W x D x H) |
|---|---|---|
| Up to 3 People | 101" x 86" x 91" | 100.9" x 85.3" x 90.4" |
| Up to 5 People | 109" x 85" x 91" | 108.8" x 84.2" x 90.4" |
| Up to 6 People | 117" x 93" x 91" | 116.7" x 92.3" x 90.4" |
| Capacity | Best For |
|---|---|
| 2-Person (C1 only) | Solo use, small bathrooms, apartments with limited space |
| 3-Person | Couples, small families, tighter interior rooms or modest yards |
| 5-Person | Families, entertaining a few guests, larger interior rooms or backyards |
| 6-Person (C2 only) | Larger households, frequent group use, spacious backyards |
For outdoor C2 installations specifically, budget extra footprint beyond the cabin's footprint itself — you'll want clearance for the door to swing open, a small landing area, and access on at least one side for maintenance.
Shipping & Delivery: What to Expect
Kohler sauna pricing includes freight shipping to the contiguous United States — there's no separate shipping line item at checkout. Canada delivery adds a flat $490 fee, and remote or complex delivery areas may require a custom freight quote.
Important: Delivery is by special appointment only, arriving on a wooden pallet via freight carrier. The driver provides curbside delivery and will lower the unit to ground level — they do not carry it into your home, backyard, or installation site. Plan for help moving the unit from the curb to its final location, especially for larger 5- and 6-person models.
Before your sauna ships, expect a call or email to confirm delivery details and flag any site-specific circumstances (narrow driveways, stairs, gate access) that could affect delivery. If you've added the professional installation upgrade, that's scheduled separately from freight delivery — the installation team assembles and places the unit after it arrives.
Flooring: Why It Only Applies to the C1
The C1's floor kit is a Scandinavian spruce interlocking floor built to match the sauna's benches and walls — purely an interior finish option for indoor installs where you want the sauna floor to look intentional rather than showing your bathroom or basement flooring underneath.
The C2 doesn't offer this option because it isn't relevant — outdoor units are placed on an exterior base (concrete pad, deck, or paver foundation) rather than a household floor, so there's nothing to "match" with an interior floor kit.
Which Kohler Sauna Is Right for You
- Lowest cost to start → C1 2-Person, Scandinavian Spruce ($15,412.50) — smallest footprint, entry price point
- Best value indoor family size → C1 5-Person, Scandinavian Spruce ($20,456.25) — room for the household, still indoor pricing
- Best modern indoor look → C1 in Graphite Grey — same performance, darker exterior, $1,700+ premium
- Best value outdoor → C2 3-Person, Douglas Fir ($33,656.25) — smallest backyard footprint
- Best backyard family size → C2 5-Person, Douglas Fir ($38,062.50) — the most popular middle ground between price and capacity
- Best modern outdoor look → C2 in Weathered Grey Spruce — cooler tone, small premium over Douglas Fir
- Largest capacity overall → C2 6-Person — up to six people, outdoor only
Frequently Asked Questions
What is the difference between the Kohler C1 and C2 sauna?
The C1 is Kohler's indoor sauna, available in 2, 3, or 5-person sizes. The C2 is Kohler's outdoor sauna, available in 3, 5, or 6-person sizes. They are not interchangeable — the C1 is not weatherproofed for outdoor use, and the C2 is not designed for indoor installation.
Can I install a Kohler C1 outdoors or a C2 indoors?
No. Each model is engineered specifically for its intended environment. The C2's weatherproofing, roof eaves, and lockable cover are built for outdoor exposure, while the C1 lacks these features. Installing either model outside its intended use voids the warranty and can damage the unit.
Do I need an electrician to install a Kohler sauna?
Yes, in almost all cases. Both the C1 and C2 use a FERO electric heater that requires a dedicated circuit, not a standard household outlet. Even if you purchase Kohler's professional installation add-on, most buyers still need a licensed electrician to run the circuit to the sauna's location.
What's included in the "With Installation" price?
Professional on-site assembly and placement of the sauna unit itself. It generally does not include electrical trenching or wiring from your home's electrical panel to the sauna — that's typically quoted separately by a local electrician based on distance and local code requirements.
Should I choose the floor kit for my Kohler C1?
The floor kit is a cosmetic and comfort choice, not a functional requirement. It gives the interior a finished, matching look, but skipping it works fine if the sauna will sit on tile, concrete, or another floor you're happy to have visible — and can make cleanup and drainage simpler.
Why does the Graphite Grey C1 cost more than Scandinavian Spruce?
The price difference is for the exterior finish material and appearance only — both finishes use the identical Scandinavian spruce interior, obeche wood bench, and FERO heater system. Graphite Grey runs roughly $1,700 to $2,700 more depending on size and configuration.
What base or foundation does a Kohler C2 need?
The C2 requires a level, stable outdoor surface such as a concrete pad, paver base, or reinforced deck section. It does not include this foundation — buyers need to prepare the base before delivery and installation.
Does shipping cost extra on a Kohler sauna?
No separate shipping fee applies within the contiguous United States — freight delivery is included in the listed price. Canada adds a flat $490 fee. Delivery is curbside only, by special appointment, on a wooden pallet, so plan to move the unit from the curb to its final location yourself unless you've added professional installation.
How much does a Kohler home sauna cost?
Kohler C1 indoor saunas start at $15,412.50 for a 2-person unit without floor or installation, and range up to $26,400 for a 5-person unit in Graphite Grey with floor and installation. Kohler C2 outdoor saunas start at $33,656.25 for a 3-person unit in Douglas Fir without installation, and range up to $50,306.25 for a 6-person unit in Weathered Grey Spruce with installation.
Have Questions Before You Buy?
As an authorized Kohler dealer, our team can walk you through space planning, installation requirements, and which size and finish fit your home before you order.
Shop All Kohler Contact UsQuestions? Jerry@CollectiveRelaxation.com | 929-493-4366
Written by Jerry Vaiana — About Jerry
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