Control Board for Ecosmart ECO 18/21/24/27/36 (CB QC MEDLRG)

Control Board PCB for Ecosmart ECO 18, 21, 24, 27 and 36

Ecosmart tankless water heater technical overview

The ECO 18 is the medium sized model and carries (2) heating elements and exchangers using two 9 kW @ 240 Volts.
The ECO 21, ECO 24, ECO 27 and ECO 36 have the largest-sized form factor and they each use heating elements and exchangers. The ECO 21 uses three 7 kW elements running at 240 Volts. The ECO 24 uses three 8 kW elements operating at 240 Volts. The ECO 27 uses three 9 kW elements running at 240 Volts. The ECO 36 uses four 9 kW elements running at 240 Volts.