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Haven & Plunge

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Sauna Heater Sizing: Matching kW to Your Room

Illustrative photo of an indoor sauna, not the exact Almost Heaven model

Illustrative photo of this product type, not the exact Almost Heaven model. Photo: Unsplash.

Almost Heaven

Logan 1-Person Indoor Sauna

A compact 1-person indoor traditional sauna, 53"W x 36"D, with a Harvia 4.5kW heater and stones included and a limited lifetime room warranty.

Capacity
1 person
Installation
indoor
Dimensions
Exterior: 53"W x 36"D x 78"H; interior 49"W x 31"D x 77"H
Power
240V, 30-amp hardwired circuit for the heater; 110V, 15-amp plug-in for lighting
$3,885 Was $5,810
Check Current Price

Price checked Oct 18, 2026.

Reference price: Select Saunas compare-at price on its product listing, checked Oct 18, 2026.

We may earn a commission if you purchase through this link, at no extra cost to you. Price and availability are set by Select Saunas and subject to change.Information last checked October 18, 2026.

Logan 1-Person Indoor Sauna

$3,885

Check Current Price

Who it may suit

  • One person with a small indoor space and access to 240V
  • Buyers who want a traditional heater, not infrared, in a small cabin

Key Specifications

Capacity
1 person
Exterior Dimensions
53"W x 36"D x 78"H
Interior Dimensions
49"W x 31"D x 77"H
Heater
Harvia 4.5kW (240V, 30A, hardwired); 6kW and Wi-Fi control upgrades offered
Wood
1⅜" tongue-and-groove rustic fir or rustic cedar
Warranty
Limited lifetime (room); heater 5-year limited, 1-year on elements

Key Features

  • Fits a closet, bathroom, or spare corner at 53" x 36"
  • Heater and stones included
  • Pre-assembled wall and roof sections
  • Uses your existing floor (concrete, tile, vinyl, laminate; not carpet)

Installation

Indoor, on a hard existing floor (carpet not recommended); 240V/30A hardwired heater circuit; two people, about 6 hours to assemble (per the listing)

Warranty

Warranty terms: check manufacturer.

What the listing said when we checked it on Oct 18, 2026: Limited lifetime warranty on the sauna room; 5-year limited warranty on the heater and its components, with 1 year on the heating elements

Pros

  • + A traditional heater included in about 13 sq ft of floor space
  • + Limited lifetime warranty on the room
  • + Full dimensions, door, and bench sizes published

Cons

  • − Needs a 240V/30A hardwired circuit even at this size
  • − 1-person bench only (31" long)
  • − 500 lbs assembled; check the floor

Our Take on the Logan 1-Person Indoor Sauna

By

Short answer: the Logan is a 1-person indoor traditional sauna, 53” x 36”, with a Harvia 4.5kW heater included, for $3,885 at Select Saunas. It fits a closet or bathroom corner but still needs a 240V/30A hardwired circuit. The room has a limited lifetime warranty.

Will it fit?

Outside, it is 53” wide, 36” deep, and 78” tall: about 13 sq ft, our arithmetic. Inside, 49” x 31” x 77”. The bench is 31” long and 16” wide, so you sit, not lie down.

At 78” tall, check your ceiling and any lights or vents above the spot.

The electrical side

Here’s what the spec sheet won’t tell you. A small cabin still has a full traditional heater. The 4.5kW Harvia draws about 19A at 240V, our arithmetic, and the listing calls for a 30A hardwired circuit. Lighting is a separate 110V/15A plug.

If 240V isn’t available, an infrared cabin on a standard outlet is the alternative. Compact Saunas for Small Spaces compares the options.

Floor and assembly

It sits on your existing floor: concrete, ceramic, vinyl, laminate, or tile, and the listing advises against carpet. Wall and roof sections come pre-assembled. Two people with a cordless drill usually take 6 hours or less.

It weighs 500 lbs assembled.

Warranty

Limited lifetime on the room; 5-year limited on the heater and components, with 1 year on the elements.

You get, you give up

You get traditional heat in about 13 sq ft, with the heater in the price. You give up room for a second person and plug-in simplicity.

Bottom line: the traditional sauna for a small indoor space, if your panel can take a 240V circuit. The Almost Heaven Sutton at $4,667 is the step up to two people.

Not medical advice.This page is general product information. Heat and cold exposure aren't safe for everyone. Talk to a physician before starting a sauna or cold plunge routine, particularly if you are pregnant or have a heart, blood pressure, or circulation condition. See our Editorial Policy.

Alternatives to Consider

Price buttons are affiliate links. We may earn a commission at no extra cost to you.Affiliate disclosure

Almost Heaven

Bridgeport 6-Person Indoor Sauna

A 6-person indoor cabin with a Harvia 8.0kW heater included, a choice of white fir or rustic cedar, and a limited lifetime warranty.

Capacity
6 people
Placement
Indoor

May suit: Larger households wanting genuine 6-person indoor capacity with the heater included

$5,337Was $8,561

Checked Oct 1, 2026

Reference price: Select Saunas compare-at price on its product listing, checked Oct 1, 2026

Almost Heaven

Grandview 4-6 Person Canopy Barrel Sauna

A wide-body 4-6 person canopy barrel sauna that ships with a heater included — electric or wood-burning — and a limited lifetime warranty.

Capacity
4-6 people (holds up to 8)
Placement
Outdoor

May suit: Larger groups or families wanting genuine 6-8 person barrel capacity

$6,358Was $10,688

Checked Oct 1, 2026

Reference price: Select Saunas compare-at price on its product listing, checked Oct 1, 2026

Frequently Asked Questions

How hot does a traditional sauna get?

Traditional saunas typically run hotter than infrared cabins, often exceeding what most infrared units reach, since they heat the surrounding air directly.

What's löyly?

Löyly is the burst of steam created when water is ladled onto the hot rocks of a traditional sauna heater.