mitsubishi’s ac/heat pumps, that have a cn105 connector (the connector is on each indoor unit; it should also work for the water tank indoor unit) can be integrated with esphome, but you have to connect each indoor unit seperatly. If you run jysty cable from each indoor unit to a central point you can use 1 esp32 for 2 indoor units. From my experience it works very well, but i have my esp on wired ethernet.

I don’t have the water heater indoor unit, so that’s part of my air indoor unit esphome config:

logger:
  baud_rate: 0

external_components:
  - source: github://echavet/MitsubishiCN105ESPHome
    refresh: 0s

climate:
  - platform: cn105
    id: hvac_eg
    name: "HVAC EG"

    horizontal_vane_select:
      icon: 'mdi:arrow-left-right'
      name: EG Horizontal Vane
    vertical_vane_select:
      icon: 'mdi:arrow-up-down'
      name: EG Vertical Vane

    supports:
      fan_mode: ["AUTO", "DIFFUSE", "LOW", "MEDIUM", "HIGH"]
      swing_mode: ["OFF", "VERTICAL", "HORIZONTAL", "BOTH"]

    uart_id: hvac_eg_uart

    update_interval: 500ms

sensor:
  - platform: uptime
    name: Uptime

uart:
  - id: hvac_eg_uart
    rx_pin: 5
    tx_pin: 17
    baud_rate: 2400

it only send the first 5 characters of the sha1 hash, thats pretty much useless for finding the password

thats what I meant. I was referring to setting PasswordAuthentication to no in the sshd_config.

just use ssh with password auth disabled, you can copy files over it with any sftp client or forward applications or an entire desktop session with waypipe. Way easier to set up and you’re not giving some silicon valley company full access to your home network nor are you affected by their services outages.

You could use a different homeserver like tuwunel (a conduit fork), which is wayy easier to setup than the official one.

Im doing this with esphome, i replaced the thermostats with dht22 sensors and wired the valves via solid state relays (one for each zone) to the esp. Im using an esp with ethernet (wt32-eth01 clone), but wifi can work, if you can place it outside of the metal box of the heating system.

For control you can use a pid controller. I think there are some, which can run directly on the esp if everything is connected to the same esp.

Note: Dont use dht22 in the bathroom, it will slowly get less accurate when exposed to high humidity. Running the onewire of the sensors straight through existing 5 conductor thermostat wire/1.5mm^2 wire works reliably