Good and simple way to monitor temperature on hot pipes in central wood boiler heating system?

Then ESPHome is what you are looking for. Configured with a simple yaml config. Like this:

esphome:
  name: hot-water-monitor
  platform: ESP32
  board: mhetesp32minikit

wifi:
  ssid: 'WAPRU'
  password: !secret wifi_pwd
  manual_ip:
    static_ip: 10.1.1.197
    gateway: 10.1.1.1
    subnet: 255.255.255.0

api:
  password: !secret api_password
  encryption:
    key: !secret api_encryption_key

logger:

ota:
  password: !secret esp_pwd

dallas:
  - pin: GPIO33
    update_interval: 3s

binary_sensor:
  - platform: status
    name: "Hot Water Monitor Status"

sensor:
  - platform: wifi_signal
    name: "Hot Water Monitor WiFi Signal"
    update_interval: 15s
    filters:
      - sliding_window_moving_average:
          window_size: 15
          send_every: 15
          send_first_at: 1

  - platform: dallas
    address: 0x1a3c01e07605b228
    name: "Tank Temperature"
    filters:
      - sliding_window_moving_average:
          window_size: 10
          send_every: 10
          send_first_at: 1

  - platform: dallas
    address:  0x58000000167d7228
    name: "HP Inlet Temperature"
    filters:
      - sliding_window_moving_average:
          window_size: 10
          send_every: 10
          send_first_at: 1

  - platform: dallas
    address: 0xa23c01e07646d628
    name: "HP Return Temperature"
    filters:
      - sliding_window_moving_average:
          window_size: 10
          send_every: 10
          send_first_at: 1

  - platform: dallas
    address: 0x2000000018fee128
    name: "Hot Water Temperature"
    filters:
      - sliding_window_moving_average:
          window_size: 10
          send_every: 10
          send_first_at: 1

  - platform: dallas
    address: 0xec00000019647a28
    name: "Tempered Water Temperature"
    filters:
      - sliding_window_moving_average:
          window_size: 10
          send_every: 10
          send_first_at: 1

  - platform: dallas
    address: 0x7900000018552628
    name: "Air Temperature"
    filters:
      - sliding_window_moving_average:
          window_size: 10
          send_every: 10
          send_first_at: 1

switch:
  - platform: restart
    name: "Hot Water Monitor Restart"

Load it up to an ESP board from your web browser, then after it is discovered by home assistant you can do whatever you want with the sensors, e.g.

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