Skip to main content
Device Type:misc
Electrical Standard:global
Board:esp8266
Difficulty:Chip needs replacement (5/5)
Project URL:https://github.com/owangen/esphome/tree/dev/esphome/components/mill_panelheater_gen2

Mill panel heater (generation 2)

General Notes​

Mill panel heaters are available in various versions. This component is specifically designed for Generation 2 panel heaters (not compatible with portable heater models). Have a look here to check which generation you have https://millheat.zendesk.com/hc/en-us/articles/360000252071-Which-generation-do-I-have. If you have a Generation 3 panel heater (which comes with a built-in ESP32), check out this component: https://github.com/ssieb/esphome_components/tree/mill/components/mill_heater

To use this component with a Generation 2 panel heater, you’ll need to replace the HF-LPT120A module with an ESP8266. Desolder

HF-LPT120A desoldered

Removed

Solder the ESP8266 in place. Refer to the GPIO Pinout section for detailed instructions

Solder

GPIO Pinout​

PIN (mill board)ESP8266Description
+3.3VVCCPower input (3.3V)
GNDGNDGround
WTXTX (GPIO1)UART transmitter
WRXRX (GPIO3)UART receiver

Configuration​

substitutions:
  devicename: "millzero_heater"  #Lower case name
  friendly_name: "Mill Zero heater"

esphome:
  name: "${devicename}"

external_components:
  source:
    type: git
    url: https://github.com/owangen/esphome
  components: [ mill_panelheater_gen2 ]

esp8266:
  board: d1_mini

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap:

captive_portal:

# Enable logging
logger:
  baud_rate: 0 # Deactived to prevent conflict with UART, sending UART to mill controller does not work if enabled

# Enable Home Assistant API
api:

ota:

uart:
  id: uart_bus
  tx_pin: GPIO01
  rx_pin: GPIO03
  baud_rate: 9600

climate:
  - platform: mill_panelheater_gen2
    name: Mill heater

Credits​

This component builds on the work by: