Manufacturer

AERCO Modbus register maps

Updated 16 October 2026

1 AERCO model, 57 registers in all, each re-typed from AERCO’s own free documentation and checked against it.

1 of 1 shown

Boiler / water heater controller
AERCO C-More Boiler Controller (Benchmark / KC series)
AERCO C-More boiler controllers (software 2.00 or later) used on Benchmark and KC Series boilers and water heaters, as a Modbus RTU slave.
57 registers · 34 writable · RTU
Also known as: C-More, Benchmark, KC1000, KC Series, Benchmark boiler, Benchmark water heater

AERCO: default communication settings

Factory defaults as the manufacturer documents them. Change one setting at a time on site and write down what you changed. Word order applies to 32-bit values; the addressing column says how the manufacturer prints register numbers (every map on this site also gives the 0-based wire address).

Model	Transport	Unit ID	Serial	Word order	Documented addressing	Registers
C-More Boiler Controller (Benchmark / KC series)	RTU	Not stated	9600 baud	CDAB	0-based	57

AERCO Modbus register maps

AERCO C-More Boiler Controller (Benchmark / KC series)

AERCO: default communication settings