Laboratory dry baths: how can tubes and microplates be heated without a water bath?

In many laboratory workflows, precise thermal control makes all the difference. Dry baths — also known as dry block heaters, block heaters, etc. — provide uniform, water-free heating by conduction via aluminium blocks tailored to microtubes, centrifuge tubes, microplates, or other vessels.

Stable, fast and clean, they ensure reliable enzymatic reactions, thawing steps and constant-temperature incubations. Depending on your needs, they are available with shaking to accelerate heat transfer, or without shaking for maximum stability.

What are the different types of dry block heaters (dry baths), and how do you choose the right one?

A dry block heater warms by conduction via a machined metal block (often anodised aluminium) whose wells match your vessels. PID control delivers typical ranges of ambient +5 to 150/200 °C with tight stability and uniformity. Heated covers/lids reduce heat loss and condensation. Selecting a model depends on load, tube format, target temperatures and whether mixing is required.

• Dry block: the go-to for perfectly repeatable temperatures. Ideal for molecular biology, clinical labs and QC.

• Shaking dry block (thermomixer/microplate incubator): combines heating with orbital/linear/vortex motion to speed up kinetics and improve homogeneity (ELISA, hybridisations, PCR preparations).

• Bead or sand baths: replace water with thermally conductive metal beads or sand, depending on the model. Highly versatile (accommodates multiple formats without a dedicated block), cleaner to use and eliminates splashing risks.

In which applications is a dry block heater used?

Versatile, dry block heaters are used wherever temperature needs to be controlled without water. Life sciences: enzymatic digests (37 °C), lysis at 56 °C, nucleic acid inactivation/elution, denaturation at 95 °C, heat shock at 42 °C. Microbiology and diagnostics: sample thawing, incubation of microplates (with shaking). Pharma/QC: temperature conditioning of retention/reference samples; solubilisation. Food and environmental testing: pre-analytical extraction and standardisation of time/temperature. Chemistry/cosmetics: maintaining vial temperature, controlled kinetics, gentle evaporation under a lid.

Available dry block heaters

Frequently asked questions about dry block heaters

What’s the difference between a dry bath and a water bath?
A dry bath heats by conduction via a block or metal beads, with no water. Cleaner, less maintenance, and no liquid-borne contamination.

What is the built-in shaking for?
It speeds up heat transfer and sample homogeneity—ideal for microplates, ELISA, hybridisations or extractions that need controlled movement.

What temperature ranges do they cover?
Most go from ambient +5 to 150 °C (up to 200 °C depending on model), with tight stability and uniformity thanks to PID control.

Do beads replace every block?

Metal beads are very versatile, but a machined block remains optimal for maximum accuracy on a given format.
Top selection criteria?
Temperature range and stability, compatible formats, capacity, shaking options, safety (over-temperature protection), heated lid and ease of cleaning.

Everyday care and safety?
Keep it dry: dust the block, wipe down with a cold disinfectant, wear heat-resistant gloves, and keep vents clear to avoid overheating.

Can a dry bath be calibrated?
Yes—using reference probes and an offset/calibration function where available, to align the display with the wells’ actual temperature.