diff --git a/src/driver_apator08.cc b/src/driver_apator08.cc
index 9e15d0f..671f8e0 100644
--- a/src/driver_apator08.cc
+++ b/src/driver_apator08.cc
@@ -34,7 +34,7 @@ namespace
         di.setDefaultFields("name,id,total_m3,timestamp");
         di.setMeterType(MeterType::WaterMeter);
         di.addLinkMode(LinkMode::T1);
-        di.addDetection(0x8614/*APT?*/, 0x03,  0x03);
+        di.addDetection(MANUFACTURER_APT, 0x03, 0x03);
         di.usesProcessContent();
         di.setConstructor([](MeterInfo& mi, DriverInfo& di){ return shared_ptr<Meter>(new Driver(mi, di)); });
     });
diff --git a/src/driver_itronheat.cc b/src/driver_itronheat.cc
new file mode 100644
index 0000000..01df39d
--- /dev/null
+++ b/src/driver_itronheat.cc
@@ -0,0 +1,122 @@
+/*
+ Copyright (C) 2022 Fredrik Öhrström (gpl-3.0-or-later)
+               2023 Andreas Horrer (gpl-3.0-or-later)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include"meters_common_implementation.h"
+
+namespace
+{
+    struct Driver : public virtual MeterCommonImplementation
+    {
+        Driver(MeterInfo &mi, DriverInfo &di);
+    };
+
+    static bool ok = registerDriver([](DriverInfo&di)
+    {
+        di.setName("itronheat");
+        di.addNameAlias("ultramaxx");
+        di.setDefaultFields("name,id,status,total_energy_consumption_kwh,total_volume_m3,timestamp");
+        di.setMeterType(MeterType::HeatMeter);
+        di.addLinkMode(LinkMode::C1);
+        di.addDetection(MANUFACTURER_ITW, 0x04, 0x00);
+        di.setConstructor([](MeterInfo& mi, DriverInfo& di){ return shared_ptr<Meter>(new Driver(mi, di)); });
+    });
+
+    Driver::Driver(MeterInfo &mi, DriverInfo &di) : MeterCommonImplementation(mi, di)
+    {
+        addOptionalLibraryFields("meter_datetime");
+
+        addStringFieldWithExtractorAndLookup(
+            "status",
+            "Meter status from error flags and tpl status field.",
+            DEFAULT_PRINT_PROPERTIES  |
+            PrintProperty::STATUS | PrintProperty::INCLUDE_TPL_STATUS,
+            FieldMatcher::build()
+            .set(MeasurementType::Instantaneous)
+            .set(VIFRange::ErrorFlags),
+            Translate::Lookup(
+                {
+                    {
+                        {
+                            "ERROR_FLAGS",
+                            Translate::MapType::BitToString,
+                            AlwaysTrigger, MaskBits(0xffff),
+                            "OK",
+                            {
+                            }
+                        },
+                    },
+                }));
+
+        addNumericFieldWithExtractor(
+            "total_energy_consumption",
+            "The total heat energy consumption recorded by this meter.",
+            DEFAULT_PRINT_PROPERTIES,
+            Quantity::Energy,
+            VifScaling::Auto, DifSignedness::Signed,
+            FieldMatcher::build()
+            .set(MeasurementType::Instantaneous)
+            .set(VIFRange::AnyEnergyVIF)
+            );
+
+        addNumericFieldWithExtractor(
+            "total_volume",
+            "The total heating media volume recorded by this meter.",
+            DEFAULT_PRINT_PROPERTIES,
+            Quantity::Volume,
+            VifScaling::Auto, DifSignedness::Signed,
+            FieldMatcher::build()
+            .set(MeasurementType::Instantaneous)
+            .set(VIFRange::Volume)
+            );
+
+        addStringFieldWithExtractor(
+            "last_year_date",
+             "Last day previous year when total energy consumption was recorded.",
+            DEFAULT_PRINT_PROPERTIES,
+            FieldMatcher::build()
+            .set(MeasurementType::Instantaneous)
+            .set(StorageNr(1))
+            .set(VIFRange::Date)
+            );
+
+        addNumericFieldWithExtractor(
+            "last_year_energy_consumption",
+            "The total energy consumption recorded at the last day of the previous year.",
+            DEFAULT_PRINT_PROPERTIES,
+            Quantity::Energy,
+            VifScaling::Auto, DifSignedness::Signed,
+            FieldMatcher::build()
+            .set(MeasurementType::Instantaneous)
+            .set(StorageNr(1))
+            .set(VIFRange::AnyEnergyVIF)
+            );
+    }
+}
+
+// Test: Heat itronheat 23340485 NOKEY
+// Comment: Allmess UltraMaXX with ITRON EquaScan hMIU RF Module
+// telegram=|444497268504342300047AD00030A52F2F_04062C0100000C1429270000066D2D130AE12B007406FEFEFEFE426C1F010D7FEB0E00000006040C995500372F2F0C7951622223|
+// {"id":"23340485","media":"heat","meter":"itronheat","meter_datetime":"2023-11-01 10:19:45","name":"Heat","status":"OK","timestamp":"1111-11-11T11:11:11Z","total_energy_consumption_kwh":300,"total_volume_m3":27.29,"last_year_date":"2000-01-31"}
+// |Heat;23340485;OK;300;27.29;1111-11-11 11:11.11
+
+// Test: Heat_lower_case itronheat 11755757 NOKEY
+// Comment: Itron Heatmeter with strange MFCT iTW instead of ITW
+// telegram=|_404497A65757751100047A040000A00406494C0000041348318000066D2B0ED7EE2A0044069A360000426CDF2C0D7FEB0700000006040C5C7E034E0C7942502321|
+// {"id":"11755757","media":"heat","meter":"itronheat","meter_datetime":"2023-10-14 23:14:43","name":"Heat_lower_case","status":"OK","timestamp":"1111-11-11T11:11:11Z","total_energy_consumption_kwh":19529,"total_volume_m3":8401.224,"last_year_date":"2022-12-31","last_year_energy_consumption_kwh": 13978}
+// |Heat_lower_case;11755757;OK;19529;8401.224;1111-11-11 11:11.11
+
diff --git a/src/meters.cc b/src/meters.cc
index 69ed5fd..9bd0ed3 100644
--- a/src/meters.cc
+++ b/src/meters.cc
@@ -112,7 +112,9 @@ bool DriverInfo::detect(uint16_t mfct, uchar type, uchar version)
     for (auto &dd : detect_)
     {
         if (dd.mfct == 0 && dd.type == 0 && dd.version == 0) continue; // Ignore drivers with no detection.
-        if (dd.mfct == mfct && dd.type == type && dd.version == version) return true;
+        //some meters send mfct where the first character ist lower case, which results in mfct which are bigger
+        //than 32767, therefore restrict mfct to correct range
+        if (dd.mfct == (mfct & 0x7fff) && dd.type == type && dd.version == version) return true;
     }
     return false;
 }