How to Choose a Rotary Evaporator: 2026 Buying Guide

A rotary evaporator ("rotovap") removes solvent from a sample by spinning a heated flask under vacuum. Choosing the right one comes down to five decisions: whether you need automated vacuum control, which glassware condenser fits your solvents, water or oil bath, how you'll pull vacuum, and voltage. This guide walks through each and maps it to the Yamato Scientific RE / REV 202/212 line. Every specification comes from Yamato's published catalog.

1. Manual or automated vacuum control? RE vs REV

• RE-202-A / RE-212-A (basic) — the standard digital evaporator. You regulate vacuum with a separate controller or manually. Lowest cost; ideal if you already have vacuum control or run simple, consistent distillations.
• REV-202M-A / REV-212M-A (with vacuum controller) — an integrated VR-102S controller (2.3" color LCD, 0–1013 hPa) with Manual, Gradient, and Auto modes. It suppresses bumping, finds the right pressure automatically, and gives reproducible runs. Choose REV for mixed solvents, unattended runs, or method consistency.

2. Which glassware set? A, B, or C

All three use the same main unit; the condenser geometry differs:

• Set A — diagonal (traditional): the classic tilted condenser. Best paired with a recirculating chiller. General-purpose.
• Set B — vertical (standard): a space-saving vertical condenser — three fit in a standard fume hood. Best where bench/hood space is tight.
• Set C — cold finger (vertical): a cold-finger condenser for volatile or low-boiling-point solvents, where you charge the finger with dry ice or coolant instead of running chilled water.

3. Water bath or oil bath?

• Water bath (BM-302/312-A) — RT +10°C to 90°C, ±1.0°C. Right for most solvents (ethanol, acetone, water, dichloromethane).
• Oil bath (BO-302/312-A) — RT +10°C to 180°C, ±2.0°C. Needed for high-boiling solvents (DMF, DMSO, toluene at low vacuum). Both are 5 L (Φ240 mm) with automatic and independent overheat protection.

4. How will you pull vacuum?

The evaporator needs a vacuum source. Yamato's N820G diaphragm pump is chemically resistant, oil-free, and pairs with the system (N820GKIT adds the hose). For closed-loop solvent recovery, add the RT302 unit. If you bought a basic RE, you can still automate later by adding the VR-102S controller and OVR10 valve, or the DIG-VPCM controller (UL/CE/CSA, USB) where the REV's wireless controller isn't permitted.

5. Voltage

Order 202 models for 115V (with plug) and 212 models for 220V (single-phase, round terminal). The machine is otherwise identical.

Compare the Yamato rotary evaporator range

Model	Vacuum control	Speed	Evaporation	Bath options	Best for
RE-202-A / 212-A	Separate / manual	5–315 rpm	Up to 23 ml/min	Water or oil, 5 L	Simple, consistent distillations
REV-202M-A / 212M-A	Integrated VR-102S	5–315 rpm	Up to 23 ml/min	Water or oil, 5 L	Automated, reproducible runs

Frequently Asked Questions

What is the difference between the RE and REV models?

The RE-202-A/212-A is the basic digital rotary evaporator; you supply vacuum control separately. The REV-202M-A/212M-A adds an integrated VR-102S vacuum controller (color LCD, 0–1013 hPa, Manual/Gradient/Auto) for automated, bumping-free, reproducible distillation.

Which glassware set should I choose?

Set A (diagonal) is the general-purpose choice and pairs with a chiller; Set B (vertical) saves space — three fit in a standard fume hood; Set C (cold finger) is for volatile or low-boiling-point solvents using dry ice or coolant in the finger.

Do I need a water bath or an oil bath?

A water bath (RT +10°C to 90°C) covers most common solvents. Choose an oil bath (RT +10°C to 180°C) for high-boiling solvents such as DMF, DMSO, or toluene. Both baths hold 5 L with automatic and independent overheat protection.

What vacuum pump works with a Yamato rotary evaporator?

Yamato's N820G diaphragm vacuum pump is chemically resistant and oil-free, and the N820GKIT works with all RE-series rotary evaporators. For automated control, combine it with the VR-102S controller and OVR10 solenoid valve, or add the RT302 solvent-recovery unit for closed-loop recovery.

What is the difference between 202 and 212 models?

It's voltage only: 202 models run on 115V (with plug), 212 models on 220V (single-phase, round terminal). The evaporator is otherwise identical.

Source: Yamato Scientific Rotary Evaporator Catalog. LabSupplies.com is an authorized Yamato dealer — genuine units, full manufacturer warranty, in stock, ships from USA.