Choosing the right autoclave for your lab

An autoclave is one of the most-used pieces of equipment in almost any life-science or healthcare facility — and choosing the wrong size, chamber geometry, or cycle type costs labs real money in both throughput delays and energy bills. At Artech we build horizontal, vertical, and double-door autoclaves to each client’s specific workload. Here’s the decision framework we run through with every buyer.

1. Match the chamber to your real loads, not your paper loads

Many buyers size the chamber based on the vessels they think they will sterilize. In practice, effective chamber volume is reduced 30–50% by baskets, trays, and airflow gaps. If you are sterilizing 10 L fermenter bags or 20 L glassware, measure a real autoclave tray and count how many actually fit after spacing.

Typical chamber-to-workload mapping

• 50–80 L — Small microbiology labs, QC labs doing a few loads per day.
• 100–150 L — Mid-size research labs, small pharma R&D.
• 200–400 L — Production or validation-heavy labs; biotech fermentation groups.
• 500 L+ — CSSD / hospital central sterilization, or pilot-plant fermentation.

2. Horizontal vs. vertical — more than a footprint decision

Vertical autoclaves have a smaller floor footprint and cost less, but they require lifting vessels into the chamber from above — a real ergonomics problem above ~70 L. Horizontal autoclaves let you roll in loaded trolleys at waist height. For anything beyond 100 L or where staff will load multiple cycles a day, always specify horizontal.

3. Gravity vs. pre/post-vacuum cycles

A simple gravity-displacement cycle is fine for open liquids and unwrapped glassware. But if you sterilize wrapped instruments, porous textiles, or sealed containers, air pockets will defeat the cycle without a pre-vacuum pulse. Validation standards (ISO 17665, EN 285 for CSSDs) specifically require pre-vacuum for porous loads. Tell us what you sterilize and we’ll set the cycle-type accordingly.

One of our pharma clients switched from a gravity cycle to a pre/post-vacuum cycle on filtered media and cut cycle time from 58 minutes to 34 — while also passing their biological-indicator validation on the first attempt.

4. Utility specs that catch buyers out

Before we ship, we review three utility specs that are often overlooked:

• Electrical supply — 3-phase 415 V is standard above 100 L; 230 V single-phase works only on smaller models.
• Water quality — Hard water shortens heater life. Softened or RO-fed water is worth specifying upfront.
• Drain capacity — Post-cycle condensate can reach 80 °C; make sure the floor drain tolerates that temperature.

5. Validation documentation

If you operate under GMP, NABL, or a regulatory audit regime, ask upfront for IQ, OQ, and PQ documentation, plus calibration certificates for the chamber and safety-valve temperature sensors. We include these as standard on every pharma-bound unit.

Not sure which model fits?

Send us a short note on your sterilization workload — vessel sizes, daily cycle count, and the most air-sensitive items you handle — and our engineering team will recommend a chamber size and cycle configuration within one business day. You can use the enquiry form on any product page or WhatsApp us directly.