Short answer: Choose a dual boiler for independent temperature control and easy repeatability. Choose a heat exchanger for a traditional workflow, powerful steam, and potentially lower cost.
How each system works
A dual boiler uses separate heated vessels for brewing and steam. A heat exchanger passes brew water through a tube inside one steam boiler, so brew temperature depends on design, idle time, and workflow.
| Priority | Dual boiler | Heat exchanger |
|---|---|---|
| Temperature control | Direct and independent | More technique-dependent |
| Steam power | Strong to excellent | Often excellent |
| Ease of dialing in | Easier | May require cooling flushes |
Our recommendation
Most home users comparing similar prices will appreciate a dual boiler’s predictable workflow. Browse the best current options or learn how dual boilers work.