High Efficiency Water Heaters

AERCO has been an industry leader in water heating design for 65 years ever since it developed the first on-demand, temperature-controlled water heater that didn’t need storage. In addition to the original B+II WaterWizard, AERCO offers a broad portfolio of indirect-fired, water-to-water and steam-to-water water heaters that provides you with a high efficiency system and instantaneous hot water across a wide variety of commercial applications from small multi-family housing to large hospitals, universities and five-star hotels.

Sizing Guidelines

  • Innovation, AM Series and SWDW U-Tube Double Wall selections should be performed using HeatSmart
  • SmartPlate selections should be made via the sizing tables found under Application and Sizing Guidelines section of the SmartPlate product page
  • B+II WaterWizard selections should be made by logging in and installing the desktop tool, HeatSmart II (1999)

For any questions on water heater sizing, please contact us at applications@aerco.com.


The AERCO Innovation commercial tankless water heater provides safe, reliable hot water on demand without the need for any significant storage volume to buffer load change and provide stable hot water temperatures.

View Innovation

AM Series Water Heaters

AM Series high efficiency water heaters provide you with a powerful hot water system with built-in redundancy in a compact footprint.

View AM Series Water Heaters


 SmartPlate water heaters are specifically engineered to complement condensing boilers in low temperature applications to promote system-wide energy efficiency. 

View SmartPlate

Steam-To-Water Heaters

AERCO's line of steam-to-water heaters feature fully modulating steam input and a temperature-control design that is time-tested across a variety of applications.

View Steam-To-Water Heaters