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Understanding AHRI 400/401 for Liquid-to-Liquid Heat Exchangers
ANSI/AHRI 400 defines rating methods, definitions and minimum marking data for liquid-to-liquid heat exchangers; AHRI also operates a third-party LLHE certification program so buyers can compare performance on a level field.
What it covers
Laboratory test requirements, rating rules and published data formats—not field testing—so that vendor selections are directly comparable.
At-a-Glance
Topic | Details |
Scope | LLHE performance rating & definitions |
Outputs | Certified selection reports and nameplate/marking data |
Certification note | AHRI Certified statements appear on selection software outputs for in-scope units. ahrinet.org |
Why it matters
Apples-to-apples thermal/hydraulic comparisons
Reduced performance risk at start-up
Supports energy/M&V programs
Buyer checklist
Ask the Vendor For | Why |
AHRI 400-based selection printout | Verifies the rating method used |
“AHRI Certified” statement on the printout | Confirms third-party certification for in-scope products |
Exact rating conditions | Ensure duty/fluids/temps match your process ahrinet.org |
FAQ
Does AHRI cover pressure-boundary code compliance?
No. AHRI addresses performance ratings; pressure rules come from codes like ASME or PED (see below).
Where AHRI fits
Thermal rating & comparability → AHRI 400/401
Pressure-boundary compliance → ASME / PED / CRN
Hygienic design & cleanability → 3-A / EHEDG
