HeatDepth / The heat journal

A clearer
view of heat.

Sauna, heat therapy, and the questions worth asking. Thoughtful reading on the evidence, the equipment, and the limits of what we know.

Read the latest feature

Heat, considered.Journal / 01

Evidence, clearly labeled.Independent editorial guidance.Educational information, not medical advice.

Three ways in.

01 — Discover

I / Read the research

The Evidence

Look beyond a headline. Understand study design, uncertainty, and where conclusions stop.

Explore the evidence

II / Understand the setup

Equipment

Materials, maintenance, and everyday constraints. Start with the questions a specification sheet cannot answer.

Browse equipment

III / Put time in context

Protocols

Temperature and duration belong in context. A routine is never a substitute for individual guidance.

Consider duration

04 — Plan the operating cost

Estimate sauna running costs.

Model warm-up, session use, accessories, standby, and your electricity rate before comparing equipment.

This arithmetic worksheet gives a planning estimate—not an electrical installation, code, heater-sizing, medical, safety, or utility-bill guarantee.

Open the sauna energy cost calculator

Latest feature / Equipment

Why Sauna Rocks Crack or Pop and When to Replace Them

□ Equipment meets context

I approach sauna rocks cracking as a maintenance question first: repeated heating and cooling gradually damage stone, and water on a hot surface adds thermal stress. Replace stones…

Read the feature

02 — Evidence lens

The claim is only
the beginning.

We ask who was studied, what was measured, and whether the result applies to the question at hand.

These labels are editorial summaries of specific claims, rather than medical grades or recommendations.

■ Established: Consistent evidence supports the specific claim within clearly stated limits.
▪ Promising: Early findings warrant attention; confirmation and broader applicability remain open.
□ Uncertain: Evidence is limited, mixed, or too indirect to support a confident conclusion.
◆ Not supported: Available evidence does not substantiate the claim as stated.