Thermory 4 Person Barrel Sauna 53 DIY Kit

Overall Dimensions: approx. 77.5" diameter x 73.9" L x 80.3" H on cradles (Thermory assembly guide, rounded)

The Thermory No 53 is a four-person barrel sauna kit built from thermally modified Nordic spruce, the heat-and-steam treatment that makes the wood more stable and rot resistant without chemicals. It is long enough for two facing benches that seat four, with a glass front door and a solid rear wall, and it installs in about a day with no cutting. You supply and install the sauna heater of your choice.

Key Specifications

Dimensions and Cutout

All drawing dimensions are Thermory's informative, rounded values from the No 50 to No 63 assembly guide.

Features

• Thermally modified spruce, enhanced with heat and steam only, for rot and moisture resistance and dimensional stability
• Full glass front door for natural light
• Deep facing benches with backrests
• Duckboard floor and heat shield included
• Rain jacket roof cover with trim for year-round outdoor use
• Pre-cut, pre-milled staves: installs in about a day with no cutting
• Steel bands and cradles hold the barrel shape
• Cable raceway for a clean heater wiring run

Look inside a Thermory barrel (360 view of the No 54; the No 53 is longer with a solid rear wall), click and drag to look around:

What Is Included and What You Will Need

• Included: barrel cradles, body staves, wall panels, glass front door, interior benches, backrest staves, duckboard flooring, fasteners, adhesive roof tape, metal bands, heat shield, cable raceway, and rain jacket with trim
• Required: a sauna heater sized for the room, installed to the heater maker's instructions
• Electric heaters: a dedicated circuit installed by a licensed electrician
• Required: a level, drained foundation such as pavers or a concrete pad
• Optional: under-bench LED lighting, installed by you or your electrician

Installation Notes

Thermory recommends installing the barrel above ground level with a water-resistant layer between the cradles and the base, on a surface that stays level so the door keeps closing properly. Two people should assemble it. Supervise the first heating with the door open, never exceed 90 C (194 F) in the steam room, and clear heavy snow from the roof without damaging the cover. Heater wiring belongs to a licensed electrician, and any wood-fired heater needs its own chimney and clearances. Local zoning and permit rules for accessory structures vary, so check with your town or HOA. Talk to our team about siting and heater selection.

Documentation

• Installation Manual

Frequently Asked Questions

Does it come with a heater?

No. The kit is the sauna room only, so you can choose a heater sized for it. Ask us for a heater recommendation.

How long does assembly take?

Thermory designs the kit to install in about a day with two people, using pre-cut staves and no cutting.

Is there a version with a rear window?

Yes. In Thermory's assembly guide the No 53 has a solid rear wall and the No 52 is the same size with a panoramic rear window. Ask us if you prefer the windowed version.

Why thermally modified spruce instead of cedar?

Thermal modification bakes the wood with heat and steam, which reduces moisture uptake, shrinking and rot, and gives an even brown tone without chemical treatment.

Warranty

Per current listing: Thermory provides a 2-year limited warranty on the wood structure against construction, manufacturing and material defects. Heaters, lighting, electrical components and glass are warranted separately by their makers.