CompareSauna

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Last updated: August 2026

Transparency: CompareSauna is a research-based comparison site. We do not physically test products unless explicitly stated. All recommendations are based on verified evidence from primary sources.

Source hierarchy

We use a tiered evidence system. Facts must be supported by primary sources, not just repeated across affiliate blogs.

Tier A — Primary authoritative

  • Official manufacturer product pages
  • Official manufacturer manuals and installation guides
  • Official specification sheets and datasheets
  • Official warranty documents
  • Amazon Creators API for current pricing, availability, and ASIN data

Tier B — Strong secondary

  • Reputable specialist retailers publishing manufacturer data
  • Independent testing organizations
  • Recognized standards or regulatory bodies

Tier C — Context only

  • Blogs, forums, and user discussions
  • Non-authoritative comparison sites

Tier C alone never establishes a technical product fact. It can identify questions to investigate, but never answer them.

What we verify

For every product in a comparison, we attempt to verify:

  • Exterior and interior dimensions
  • Rated electrical power and voltage
  • Heater type and specifications
  • Occupancy capacity
  • Materials and construction
  • Temperature range (where documented)
  • Indoor/outdoor rating
  • Assembly requirements
  • Warranty terms
  • Certifications (only if documented)

If we cannot verify a specification from a primary source, we either:

  1. Attribute the claim explicitly to its source
  2. Rewrite the statement more narrowly
  3. Omit the claim
  4. Omit the product from the comparison

Conflict resolution

When sources disagree (e.g., Amazon listing says 1800W but the manual says 1500W), we:

  1. Verify the exact model and variant
  2. Check manual revision dates
  3. Seek a second manufacturer source
  4. If unresolved, exclude that specification or note the conflict openly

We never choose whichever value makes the article easier.

What we don't do

  • Claim hands-on testing that didn't happen
  • Infer specifications from product photographs
  • Convert marketing language into objective facts
  • Invent review statistics or aggregate ratings
  • Scrape Amazon customer reviews without API authorization