Choosing Between the CS3 and CS4 Electric Compressors

If you already know you need an electric compressor, compare the CS3 and CS4 with the same cylinder and use case in mind. Begin with the published power and airflow, then ask for evidence that covers your proposed cylinder and filling arrangement. A useful quote identifies the model, the version supplied and the conditions behind any timing figures.

Read the published figures in context

The TRIMIX CS3 listing gives 250 W and an air output of 8 L/min. The TRIMIX CS4 listing gives 300 W and 11 L/min. These are catalogue figures. Ask what the airflow number represents and whether the two figures were obtained under comparable conditions. An airflow figure and the electrical input each answer a different question about the equipment.

Use the estimates to frame questions. If a quote is for a cylinder outside the examples, ask the supplier for the exact supporting instructions and reference conditions instead of extending the table yourself. Ask about starting pressure, cooling limits and whether quoted elapsed time includes breaks. Give the same assumptions to both suppliers.

Compare the evidence before comparing the prices

For each offer, write down the nameplate model and version, supplied power components, outlet fittings and filtration. Request the current instructions and any air-quality evidence for the proposed arrangement. A qualified dive fill provider can check the cylinder markings and the entire configuration. Divers Alert Network’s breathing-gas guidance explains the role of gas analysis, contamination control and maintenance records.

Ask how you would obtain model-specific replacement filters and service after buying. A written answer helps you compare availability and maintenance time alongside the equipment price. If the offers describe different fittings or accessories, list those items separately so each total covers the same needs.

Use the CS4 quote inquiry if you want to compare that model against a CS3 offer. Include your cylinder identification, available power and country. Request an itemized configuration and the technical evidence a qualified provider needs to evaluate it.

Evergreen buyer guide verified November 12, 2026. Sources: TRIMIX CS3 Electric Air Compressor product listing (2026-10-21); TRIMIX CS4 Electric Air Compressor product listing (2026-10-21); Divers Alert Network breathing-gas contamination guidance (undated).