diff --git a/CODEOWNERS b/CODEOWNERS
index e859a9d0eac..66332531bd8 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -131,6 +131,7 @@ homeassistant/components/growatt_server/* @indykoning
 homeassistant/components/gtfs/* @robbiet480
 homeassistant/components/harmony/* @ehendrix23
 homeassistant/components/hassio/* @home-assistant/hass-io
+homeassistant/components/heatmiser/* @andylockran
 homeassistant/components/heos/* @andrewsayre
 homeassistant/components/here_travel_time/* @eifinger
 homeassistant/components/hikvision/* @mezz64
diff --git a/homeassistant/components/heatmiser/climate.py b/homeassistant/components/heatmiser/climate.py
index 6693e71878a..1954749c21b 100644
--- a/homeassistant/components/heatmiser/climate.py
+++ b/homeassistant/components/heatmiser/climate.py
@@ -4,56 +4,62 @@ from typing import List
 
 import voluptuous as vol
 
+from heatmiserV3 import heatmiser, connection
 from homeassistant.components.climate import (
     ClimateDevice,
     PLATFORM_SCHEMA,
     HVAC_MODE_HEAT,
+    HVAC_MODE_OFF,
 )
 from homeassistant.components.climate.const import SUPPORT_TARGET_TEMPERATURE
 from homeassistant.const import (
     TEMP_CELSIUS,
+    TEMP_FAHRENHEIT,
     ATTR_TEMPERATURE,
+    CONF_HOST,
     CONF_PORT,
-    CONF_NAME,
     CONF_ID,
+    CONF_NAME,
 )
 import homeassistant.helpers.config_validation as cv
 
+
 _LOGGER = logging.getLogger(__name__)
 
-CONF_IPADDRESS = "ipaddress"
-CONF_TSTATS = "tstats"
+CONF_THERMOSTATS = "tstats"
 
 TSTATS_SCHEMA = vol.Schema(
-    {vol.Required(CONF_ID): cv.string, vol.Required(CONF_NAME): cv.string}
+    vol.All(
+        cv.ensure_list,
+        [{vol.Required(CONF_ID): cv.positive_int, vol.Required(CONF_NAME): cv.string}],
+    )
 )
 
 PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
     {
-        vol.Required(CONF_IPADDRESS): cv.string,
-        vol.Required(CONF_PORT): cv.port,
-        vol.Required(CONF_TSTATS, default={}): vol.Schema({cv.string: TSTATS_SCHEMA}),
+        vol.Required(CONF_HOST): cv.string,
+        vol.Required(CONF_PORT): cv.string,
+        vol.Optional(CONF_THERMOSTATS, default=[]): TSTATS_SCHEMA,
     }
 )
 
 
 def setup_platform(hass, config, add_entities, discovery_info=None):
     """Set up the heatmiser thermostat."""
-    from heatmiserV3 import heatmiser, connection
 
-    ipaddress = config.get(CONF_IPADDRESS)
-    port = str(config.get(CONF_PORT))
-    tstats = config.get(CONF_TSTATS)
+    heatmiser_v3_thermostat = heatmiser.HeatmiserThermostat
 
-    serport = connection.connection(ipaddress, port)
-    serport.open()
+    host = config[CONF_HOST]
+    port = config[CONF_PORT]
+
+    thermostats = config[CONF_THERMOSTATS]
+
+    uh1_hub = connection.HeatmiserUH1(host, port)
 
     add_entities(
         [
-            HeatmiserV3Thermostat(
-                heatmiser, tstat.get(CONF_ID), tstat.get(CONF_NAME), serport
-            )
-            for tstat in tstats.values()
+            HeatmiserV3Thermostat(heatmiser_v3_thermostat, thermostat, uh1_hub)
+            for thermostat in thermostats
         ],
         True,
     )
@@ -62,15 +68,17 @@ def setup_platform(hass, config, add_entities, discovery_info=None):
 class HeatmiserV3Thermostat(ClimateDevice):
     """Representation of a HeatmiserV3 thermostat."""
 
-    def __init__(self, heatmiser, device, name, serport):
+    def __init__(self, therm, device, uh1):
         """Initialize the thermostat."""
-        self.heatmiser = heatmiser
-        self.serport = serport
+        self.therm = therm(device[CONF_ID], "prt", uh1)
+        self.uh1 = uh1
+        self._name = device[CONF_NAME]
         self._current_temperature = None
         self._target_temperature = None
-        self._name = name
         self._id = device
         self.dcb = None
+        self._hvac_mode = HVAC_MODE_HEAT
+        self._temperature_unit = None
 
     @property
     def supported_features(self):
@@ -85,7 +93,7 @@ class HeatmiserV3Thermostat(ClimateDevice):
     @property
     def temperature_unit(self):
         """Return the unit of measurement which this thermostat uses."""
-        return TEMP_CELSIUS
+        return self._temperature_unit
 
     @property
     def hvac_mode(self) -> str:
@@ -93,7 +101,7 @@ class HeatmiserV3Thermostat(ClimateDevice):
 
         Need to be one of HVAC_MODE_*.
         """
-        return HVAC_MODE_HEAT
+        return self._hvac_mode
 
     @property
     def hvac_modes(self) -> List[str]:
@@ -101,7 +109,7 @@ class HeatmiserV3Thermostat(ClimateDevice):
 
         Need to be a subset of HVAC_MODES.
         """
-        return [HVAC_MODE_HEAT]
+        return [HVAC_MODE_HEAT, HVAC_MODE_OFF]
 
     @property
     def current_temperature(self):
@@ -116,12 +124,25 @@ class HeatmiserV3Thermostat(ClimateDevice):
     def set_temperature(self, **kwargs):
         """Set new target temperature."""
         temperature = kwargs.get(ATTR_TEMPERATURE)
-        self.heatmiser.hmSendAddress(self._id, 18, temperature, 1, self.serport)
+        self._target_temperature = int(temperature)
+        self.therm.set_target_temp(self._target_temperature)
 
     def update(self):
         """Get the latest data."""
-        self.dcb = self.heatmiser.hmReadAddress(self._id, "prt", self.serport)
-        low = self.dcb.get("floortemplow ")
-        high = self.dcb.get("floortemphigh")
-        self._current_temperature = (high * 256 + low) / 10.0
-        self._target_temperature = int(self.dcb.get("roomset"))
+        self.uh1.reopen()
+        if not self.uh1.status:
+            _LOGGER.error("Failed to update device %s", self._name)
+            return
+        self.dcb = self.therm.read_dcb()
+        self._temperature_unit = (
+            TEMP_CELSIUS
+            if (self.therm.get_temperature_format() == "C")
+            else TEMP_FAHRENHEIT
+        )
+        self._current_temperature = int(self.therm.get_floor_temp())
+        self._target_temperature = int(self.therm.get_target_temp())
+        self._hvac_mode = (
+            HVAC_MODE_OFF
+            if (int(self.therm.get_current_state()) == 0)
+            else HVAC_MODE_HEAT
+        )
diff --git a/homeassistant/components/heatmiser/manifest.json b/homeassistant/components/heatmiser/manifest.json
index b3882c63c51..89bcec08125 100644
--- a/homeassistant/components/heatmiser/manifest.json
+++ b/homeassistant/components/heatmiser/manifest.json
@@ -3,8 +3,10 @@
   "name": "Heatmiser",
   "documentation": "https://www.home-assistant.io/integrations/heatmiser",
   "requirements": [
-    "heatmiserV3==0.9.1"
+    "heatmiserV3==1.1.18"
   ],
   "dependencies": [],
-  "codeowners": []
-}
+  "codeowners": [
+    "@andylockran"
+  ]
+}
\ No newline at end of file
diff --git a/requirements_all.txt b/requirements_all.txt
index 60b8dbb43ca..75fc2dd5bbd 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -643,7 +643,7 @@ hbmqtt==0.9.5
 hdate==0.9.3
 
 # homeassistant.components.heatmiser
-heatmiserV3==0.9.1
+heatmiserV3==1.1.18
 
 # homeassistant.components.here_travel_time
 herepy==0.6.3.3