BOCK HG/HGX — German semi-hermetic recip for industrial duty
By DigiEntropy Engineering · 2026-03-08 · 5 min read
BOCK's HG and HGX families are the German engineering standard for industrial semi-hermetic reciprocating compressors. R744-qualified ECOLINE-equivalent variants, ammonia industrial, transport refrigeration — BOCK covers ranges where Bitzer doesn't quite fit.
About this post — Authored by an AI assistant using DigiEntropy's polynomial corpus, the universal compressor predictor, and the project's chart-generation tooling. Charts are produced by Python scripts that read the same database the live site queries; tables and formulas are pulled from the same engineering modules. Findings reflect the project's current dataset and methodology — send corrections or deeper questions to admin@digientropy.com.
BOCK Kältemaschinen (founded 1932, now part of GEA) makes a specific kind of compressor: semi-hermetic reciprocating, German-engineered, optimised for industrial-duty cycles. The HG and HGX families are the workhorses — HG for general industrial, HGX for the F-Gas-era extended-envelope variants.
BOCK sits in DigiEntropy as one of the longest-tail brand integrations, with a transparent decoded catalog covering most of the industrial commercial refrigeration sizes Bitzer doesn't quite specialise in.
1932 - BOCK founded - now part of GEA
BOCK Kältemaschinen (founded 1932, now part of GEA) makes a specific kind of compressor: semi-hermetic reciprocating, German-engineered, optimised for industrial-duty cycles.
20-100 kW - HGX CO2 versus Bitzer ECOLINE CO2 - per compressor
BOCK's HGX CO2 variants compete strongly with Bitzer ECOLINE CO2 in the 20-100 kW per compressor range.
200-1000 kW - ammonia cold storage - mid-size industrial, central and eastern Europe
BOCK's HG ammonia variants are deployed extensively in mid-size (200-1000 kW) industrial cold storage, particularly in central and eastern Europe.
80,000+ h - designed service life - BOCK HGX CO2
Reliability: industrial-grade build, designed for 80,000+ hour service life.
± 10 % - pricing parity with Bitzer - central and eastern European supermarket packs
For supermarket packs in central + eastern Europe, BOCK and Bitzer both compete actively. Pricing parity ± 10 %; choice often comes down to local distributor support.
9754 - polynomial rows after ingest - from 14.4 MB of decoded source
DigiEntropy's BOCK integration decodes that file to plaintext for the polynomial + envelope data — 14.4 MB of source, 9754 polynomial rows after ingest.
Where BOCK wins
Three niches where BOCK is the default rather than the alternative, one per tab:
Transport
1. Transport refrigeration. BOCK's HGX12 and HG12 series are widely used in truck/trailer refrigeration (Carrier Transicold, Thermo King, and others ship BOCK compressors in their TRU units). The compressors are designed for the vibration / shock / wide-ambient envelope that truck refrigeration demands.
R744 transcritical
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