diff --git a/src/main.tsp b/src/main.tsp
index b237fbe60..c04270a3f 100644
--- a/src/main.tsp
+++ b/src/main.tsp
@@ -9,6 +9,7 @@ import "./vaillant/06.vms.tsp";
 import "./vaillant/08.bai.tsp";
 import "./vaillant/08.ehp.tsp";
 import "./vaillant/08.hmu.tsp";
+import "./vaillant/08.hmu.HW5103.tsp";
 import "./vaillant/08.recov.tsp";
 import "./vaillant/08.v3x.tsp";
 import "./vaillant/0a.pmw.hwc.tsp";
diff --git a/src/vaillant/08.hmu.HW5103.tsp b/src/vaillant/08.hmu.HW5103.tsp
new file mode 100644
index 000000000..a304f6228
--- /dev/null
+++ b/src/vaillant/08.hmu.HW5103.tsp
@@ -0,0 +1,454 @@
+import "@ebusd/ebus-typespec";
+import "./_templates.tsp";
+using Ebus;
+using Ebus.Num;
+using Ebus.Dtm;
+using Ebus.Str;
+namespace Vaillant;
+
+// @zz(0x08)
+namespace Hmu.Hw5103 {
+  // B509
+  /** default *r */
+  @base(MF, 0x9, 0x54, 0x2, 0)
+  model r_0 {
+    @maxLength(4)
+    value: IGN;
+  }
+
+  @inherit(r_0)
+  @ext(0xd, 0xa)
+  model CompressorSpeed {
+    @unit("rps")
+    value: EXP;
+  }
+
+  @inherit(r_0)
+  @ext(0x28, 0xa)
+  model EevPositionAbs {
+    value: UIN;
+  }
+
+  @inherit(r_0)
+  @ext(0x47, 0xa)
+  model Fan1Speed {
+    @unit("rpm")
+    value: EXP;
+  }
+
+  @inherit(r_0)
+  @ext(0x49, 0xa)
+  model Fan2Speed {
+    @unit("rpm")
+    value: EXP;
+  }
+
+  @inherit(r_0)
+  @ext(0x53, 0xd)
+  model Statuscode {
+    value: hmucode;
+  }
+
+/**
+  @inherit(r_0)
+  @ext(0x5b, 0xd)
+  model ElectricPowerConsumption {
+    @unit("W")
+    value: EXP;
+  }
+*/
+
+  @inherit(r_0)
+  @ext(0x6a, 0x9)
+  model HighPressure {
+    value: pressv;
+  }
+
+  @inherit(r_0)
+  @ext(0x98, 0x8)
+  model CompressorInletTemp {
+    value: tempv;
+  }
+
+  @inherit(r_0)
+  @ext(0xa2, 0x8)
+  model CompressorOutletTemp {
+    value: tempv;
+  }
+
+/**
+  @inherit(r_0)
+  @ext(0xa6, 0xe)
+  model DiagFlowTemp {
+    value: tempv;
+  }
+
+  @inherit(r_0)
+  @ext(0xa7, 0xe)
+  model DiagEvaporationTemp {
+    value: tempv;
+  }
+
+  @inherit(r_0)
+  @ext(0xa9, 0xe)
+  model DiagOverheatingActualValue {
+    value: tempv;
+  }
+*/
+
+  @inherit(r_0)
+  @ext(0xac, 0x8)
+  model EevOutletTemp {
+    value: tempv;
+  }
+
+  @inherit(r_0)
+  @ext(0xb8, 0xb)
+  model HmuHours {
+    value: hoursum2;
+  }
+
+  @inherit(r_0)
+  @ext(0xb9, 0xb)
+  model HeatingHours {
+    value: hoursum2;
+  }
+
+  @inherit(r_0)
+  @ext(0xbc, 0xb)
+  model WaterHours {
+    value: hoursum2;
+  }
+
+/**
+  @inherit(r_0)
+  @ext(0xbd, 0x9)
+  model DiagWaterThroughput {
+    @unit("l/h")
+    value: EXP;
+  }
+*/
+
+  @inherit(r_0)
+  @ext(0xc2, 0xb)
+  model CompressorHours {
+    value: hoursum2;
+  }
+
+  @inherit(r_0)
+  @ext(0xc3, 0xb)
+  model CompressorStarts {
+    value: cntstarts2;
+  }
+
+  @inherit(r_0)
+  @ext(0xc4, 0xb)
+  model BuildingPumpHours {
+    value: hoursum2;
+  }
+
+  @inherit(r_0)
+  @ext(0xc5, 0x9)
+  model BuildingPumpPower {
+    @unit("%")
+    value: EXP;
+  }
+
+  @inherit(r_0)
+  @ext(0xc5, 0xb)
+  model BuildingPumpStarts {
+    value: cntstarts2;
+  }
+
+  @inherit(r_0)
+  @ext(0xc8, 0xb)
+  model FourPortValveHours {
+    value: hoursum2;
+  }
+
+  @inherit(r_0)
+  @ext(0xc9, 0xb)
+  model FourPortValveSwitches {
+    value: cntstarts2;
+  }
+
+  @inherit(r_0)
+  @ext(0xd7, 0xb)
+  model Fan1Hours {
+    value: hoursum2;
+  }
+
+  @inherit(r_0)
+  @ext(0xd8, 0xb)
+  model Fan1Starts {
+    value: cntstarts2;
+  }
+
+  @inherit(r_0)
+  @ext(0xd9, 0xb)
+  model Fan2Hours {
+    value: hoursum2;
+  }
+
+  @inherit(r_0)
+  @ext(0xda, 0xb)
+  model Fan2Starts {
+    value: cntstarts2;
+  }
+
+  @inherit(r_0)
+  @ext(0xde, 0x8)
+  model AirInletTemp {
+    value: tempv;
+  }
+
+  // B511
+  /** default *r */
+  @base(MF, 0x11)
+  model r_1 {}
+
+  @inherit(r_1)
+  @ext(1)
+  model Status {
+    supplytemp: temp1;
+    returntemp: temp1;
+    @maxLength(4) ign: IGN;
+    pumpstate: pumpstate;
+  }
+
+  @condition(Id.Id.sw, ">=902")
+  @inherit(r_1)
+  @ext(0x18, 1)
+  model CompressorHeating {
+    @maxLength(1) ign: IGN;
+    runtime: minutes4;
+    cycles: cntstarts;
+  }
+
+  @condition(Id.Id.sw, ">=902")
+  @inherit(r_1)
+  @ext(0x18, 0x2)
+  model CompressorWater {
+    @maxLength(1) ign: IGN;
+    runtime: minutes4;
+    cycles: cntstarts;
+  }
+
+  // B516
+  /** default *r */
+  @base(MF, 0x16)
+  model r_2 {
+    @maxLength(1)
+    value: IGN;
+  }
+
+  @inherit(r_2)
+  @ext(0x14)
+  model CurrentPowerConsumption {
+    @unit("W")
+    value: EXP;
+  }
+
+  // B51A FF32xx
+  /** default *r */
+  @base(MF, 0x1a, 0x5, 0xff, 0x32)
+  model r_3 {
+    @maxLength(3)
+    value: IGN;
+  }
+
+  @inherit(r_3)
+  @ext(0)
+  model YieldHeatingDay {
+    @unit("kWh")
+    @divisor(10)
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(1)
+  model YieldCoolingDay {
+    @unit("kWh")
+    @divisor(10)
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0x2)
+  model YieldWaterDay {
+    @unit("kWh")
+    @divisor(10)
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0xe)
+  model YieldHeatingMonth {
+    @unit("kWh")
+    @divisor(10)
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0xf)
+  model CopHeatingMonth {
+    @divisor(10)
+    value: UIN;
+  }
+
+  @inherit(r_3)
+  @ext(0x10)
+  model YieldHeating {
+    @unit("kWh")
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0x11)
+  model CopHeating {
+    @divisor(10)
+    value: UIN;
+  }
+
+  @inherit(r_3)
+  @ext(0x12)
+  model YieldWaterMonth {
+    @unit("kWh")
+    @divisor(10)
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0x13)
+  model CopWaterMonth {
+    @divisor(10)
+    value: UIN;
+  }
+
+  @inherit(r_3)
+  @ext(0x16)
+  model YieldWater {
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0x17)
+  model CopWater {
+    @divisor(10)
+    value: UIN;
+  }
+
+  @inherit(r_3)
+  @ext(0x1e)
+  model CompressorBlocktime {
+    @unit("min")
+    value: UIN;
+  }
+
+  @inherit(r_3)
+  @ext(0x1f)
+  model SupplyTempWeighted {
+    @unit("°C")
+    @divisor(10)
+    value: D2C;
+  }
+
+  @inherit(r_3)
+  @ext(0x20)
+  model FlowTemp {
+    @unit("°C")
+    value: D2C;
+  }
+
+  @inherit(r_3)
+  @ext(0x21)
+  model EnergyIntegral {
+    value: integral;
+  }
+
+/**
+  @inherit(r_3)
+  @ext(0x22)
+  model SourceTempInput {
+    @unit("°C")
+    value: D2C;
+  }
+*/
+
+  @inherit(r_3)
+  @ext(0x23)
+  model CurrentYieldPower {
+    @unit("kW")
+    @divisor(10)
+    value: D1B;
+  }
+
+  @inherit(r_3)
+  @ext(0x24)
+  model CurrentConsumedPower {
+    @unit("kW")
+    @divisor(10)
+    value: D1B;
+  }
+
+  @inherit(r_3)
+  @ext(0x25)
+  model CompressorModulation {
+    @unit("%")
+    value: D2C;
+  }
+
+  @inherit(r_3)
+  @ext(0x2A)
+  model YieldCoolingMonth {
+    @unit("kWh")
+    @divisor(10)
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0x2B)
+  model CopCoolingMonth {
+    @divisor(10)
+    value: UIN;
+  }
+
+  @inherit(r_3)
+  @ext(0x2C)
+  model YieldCooling {
+    @unit("kWh")
+    @divisor(10)
+    value: energy;
+  }
+
+  @inherit(r_3)
+  @ext(0x2D)
+  model CopCooling {
+    @divisor(10)
+    value: UIN;
+  }
+
+
+  @inherit(r_3)
+  @ext(0x3c)
+  model WaterThroughput {
+    @unit("l/h")
+    value: UIN;
+  }
+
+  @condition(Id.Id.sw, ">=902")
+  @inherit(r_3)
+  @ext(0x3d)
+  model FlowPressure {
+    @unit("bar")
+    @divisor(4)
+    value: D2C;
+  }
+
+  @inherit(r_3)
+  @ext(0x4d)
+  model TotalEnergyUsage {
+    @unit("kWh")
+    value: energy;
+  }
+}
diff --git a/src/vaillant/_templates.tsp b/src/vaillant/_templates.tsp
index 2dcbc32f7..e13b214a0 100644
--- a/src/vaillant/_templates.tsp
+++ b/src/vaillant/_templates.tsp
@@ -470,6 +470,10 @@ model rTimeSlotWithoutTemp {
 @values(Values_appliancecode)
 scalar appliancecode extends UCH;
 
+/** HMU Status code */
+@values(Values_hmucode)
+scalar hmucode extends UIN;
+
 enum Values_daysel {
   selected: 0,
   Mo_Fr: 1,
@@ -730,6 +734,62 @@ enum Values_appliancecode {
   frost_protect: 34,
 }
 
+enum Values_hmucode {
+  frost_protect: 34,
+  standby: 100,
+  heat_compressor_shutdown: 101,
+  heat_compressor_blocked: 102,
+  heat_prerun: 103,
+  heat_compressor_active: 104,
+  heat_overrun: 107,
+  cool_compressor_shutdown: 111,
+  cool_compressor_blocked: 112,
+  cool_prerun: 113,
+  cool_compressor_active: 114,
+  cool_overrun: 117,
+  heat_immersion_heater_active: 125,
+  hwc_compressor_blocked: 132,
+  hwc_prerun: 133,
+  hwc_compressor_active: 134,
+  hwc_immersion_heater_active: 135,
+  hwc_overrun: 137,
+  heat_immersion_heater_shutdown: 141,
+  heat_immersion_heater_blocked: 142,
+  hwc_immersion_heater_shutdown: 151,
+  hwc_immersion_heater_blocked: 152,
+  air_purging_program_active: 202,
+  compressor_oil_heating_activated: 240,
+  fan1_blocked: 252,
+  fan1_airinlet_too_high: 255,
+  fan1_airinlet_too_low: 256,
+  fan2_blocked: 260,
+  building_circuit_flow_too_low: 275,
+  building_circuit_pump_fault: 277,
+  frequency_converter_fault_compressor: 280,
+  frequency_converter_fault_mains_voltage: 281,
+  frequency_converter_fault_overheating: 282,
+  deicing_time_too_long: 283,
+  deicing_flow_temperature_too_low: 284,
+  compressor_outlet_temperature_too_high: 285,
+  hot_gas_temperature_switch_open: 286,
+  fan1_wind: 287,
+  fan2_wind: 288,
+  current_limt_active: 289,
+  high_pressure_switch_open: 302,
+  compressor_outlet_temperature_too_high_1: 303,
+  evaporation_temperature_too_low: 304,
+  condensation_temperature_too_low: 305,
+  evaporation_temperature_too_high: 306,
+  condensation_temperature_too_high: 308,
+  building_circuit_return_temperature_too_low: 312,
+  building_circuit_return_temperature_too_high: 314,
+  immersion_heater_flow_temperature_too_high: 351,
+  deicing_active: 516,
+  frequency_converter_fault: 575,
+  connection_fault_frequency_converter: 581,
+  four_port_valve_position_fault: 590,
+}
+
 /** default *r for register */
 @base(MF, 0x9, 0xd)
 model r {}