diff --git a/src/meter_hydrocalm3.cc b/src/meter_hydrocalm3.cc
new file mode 100644
index 0000000..e89572f
--- /dev/null
+++ b/src/meter_hydrocalm3.cc
@@ -0,0 +1,298 @@
+/*
+ Copyright (C) 2018-2020 Fredrik Öhrström
+                    2020 Eric Bus
+
+ 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.h"
+#include"meters_common_implementation.h"
+#include"dvparser.h"
+#include"wmbus.h"
+#include"wmbus_utils.h"
+#include"util.h"
+
+#define INFO_CODE_VOLTAGE_INTERRUPTED 1
+#define INFO_CODE_LOW_BATTERY_LEVEL 2
+#define INFO_CODE_EXTERNAL_ALARM 4
+#define INFO_CODE_SENSOR_T1_ABOVE_MEASURING_RANGE 8
+#define INFO_CODE_SENSOR_T2_ABOVE_MEASURING_RANGE 16
+#define INFO_CODE_SENSOR_T1_BELOW_MEASURING_RANGE 32
+#define INFO_CODE_SENSOR_T2_BELOW_MEASURING_RANGE 64
+#define INFO_CODE_TEMP_DIFF_WRONG_POLARITY 128
+
+struct MeterHydrocalM3 : public virtual HeatMeter, public virtual MeterCommonImplementation {
+    MeterHydrocalM3(MeterInfo &mi);
+
+    double totalEnergyConsumption(Unit u);
+    string status();
+    double totalVolume(Unit u);
+    double volumeFlow(Unit u);
+
+    // Water temperatures
+    double t1Temperature(Unit u);
+    bool  hasT1Temperature();
+    double t2Temperature(Unit u);
+    bool  hasT2Temperature();
+
+private:
+    void processContent(Telegram *t);
+
+    uchar info_codes_ {};
+    double total_energy_kwh_ {};
+    double total_volume_m3_ {};
+    double volume_flow_m3h_ {};
+    double t1_temperature_c_ { 127 };
+    bool has_t1_temperature_ {};
+    double t2_temperature_c_ { 127 };
+    bool has_t2_temperature_ {};
+    string target_date_ {};
+
+    uint32_t energy_forward_kwh_ {};
+    uint32_t energy_returned_kwh_ {};
+};
+
+MeterHydrocalM3::MeterHydrocalM3(MeterInfo &mi) :
+    MeterCommonImplementation(mi, MeterType::HYDROCALM3)
+{
+    setExpectedELLSecurityMode(ELLSecurityMode::AES_CTR);
+
+    addLinkMode(LinkMode::T1);
+
+    addPrint("total_energy_consumption", Quantity::Energy,
+             [&](Unit u){ return totalEnergyConsumption(u); },
+             "The total energy consumption recorded by this meter.",
+             true, true);
+
+    addPrint("total_volume", Quantity::Volume,
+             [&](Unit u){ return totalVolume(u); },
+             "Total volume of media.",
+             true, true);
+
+    addPrint("volume_flow", Quantity::Flow,
+             [&](Unit u){ return volumeFlow(u); },
+             "The current flow.",
+             true, true);
+
+    addPrint("t1_temperature", Quantity::Temperature,
+             [&](Unit u){ return t1Temperature(u); },
+             "The T1 temperature.",
+             true, true);
+
+    addPrint("t2_temperature", Quantity::Temperature,
+             [&](Unit u){ return t2Temperature(u); },
+             "The T2 temperature.",
+             true, true);
+
+    addPrint("at_date", Quantity::Text,
+             [&](){ return target_date_; },
+             "Date when total energy consumption was recorded.",
+             false, true);
+
+    addPrint("current_status", Quantity::Text,
+             [&](){ return status(); },
+             "Status of meter.",
+             true, true);
+
+    addPrint("energy_forward_kwh", Quantity::Text,
+             [&](){ return to_string(energy_forward_kwh_); },
+             "Energy forward.",
+             false, true);
+
+    addPrint("energy_returned_kwh", Quantity::Text,
+             [&](){ return to_string(energy_returned_kwh_); },
+             "Energy returned.",
+             false, true);
+
+}
+
+shared_ptr<HeatMeter> createHydrocalM3(MeterInfo &mi) {
+    return shared_ptr<HeatMeter>(new MeterHydrocalM3(mi));
+}
+
+double MeterHydrocalM3::totalEnergyConsumption(Unit u)
+{
+    assertQuantity(u, Quantity::Energy);
+    return convert(total_energy_kwh_, Unit::KWH, u);
+}
+
+double MeterHydrocalM3::totalVolume(Unit u)
+{
+    assertQuantity(u, Quantity::Volume);
+    return convert(total_volume_m3_, Unit::M3, u);
+}
+
+double MeterHydrocalM3::t1Temperature(Unit u)
+{
+    assertQuantity(u, Quantity::Temperature);
+    return convert(t1_temperature_c_, Unit::C, u);
+}
+
+bool MeterHydrocalM3::hasT1Temperature()
+{
+    return has_t1_temperature_;
+}
+
+double MeterHydrocalM3::t2Temperature(Unit u)
+{
+    assertQuantity(u, Quantity::Temperature);
+    return convert(t2_temperature_c_, Unit::C, u);
+}
+
+bool MeterHydrocalM3::hasT2Temperature()
+{
+    return has_t2_temperature_;
+}
+
+double MeterHydrocalM3::volumeFlow(Unit u)
+{
+    assertQuantity(u, Quantity::Flow);
+    return convert(volume_flow_m3h_, Unit::M3H, u);
+}
+
+void MeterHydrocalM3::processContent(Telegram *t)
+{
+    /*
+      (multical603) 13: 78 tpl-ci-field (EN 13757-3 Application Layer (no tplh))
+      (multical603) 14: 04 dif (32 Bit Integer/Binary Instantaneous value)
+      (multical603) 15: 06 vif (Energy kWh)
+      (multical603) 16: * A5000000 total energy consumption (165.000000 kWh)
+      (multical603) 1a: 04 dif (32 Bit Integer/Binary Instantaneous value)
+      (multical603) 1b: FF vif (Vendor extension)
+      (multical603) 1c: 07 vife (?)
+      (multical603) 1d: 2B010000
+      (multical603) 21: 04 dif (32 Bit Integer/Binary Instantaneous value)
+      (multical603) 22: FF vif (Vendor extension)
+      (multical603) 23: 08 vife (?)
+      (multical603) 24: 9C000000
+      (multical603) 28: 04 dif (32 Bit Integer/Binary Instantaneous value)
+      (multical603) 29: 14 vif (Volume 10⁻² m³)
+      (multical603) 2a: * 21020000 total volume (5.450000 m3)
+      (multical603) 2e: 04 dif (32 Bit Integer/Binary Instantaneous value)
+      (multical603) 2f: 3B vif (Volume flow l/h)
+      (multical603) 30: * 12000000 volume flow (0.018000 m3/h)
+      (multical603) 34: 02 dif (16 Bit Integer/Binary Instantaneous value)
+      (multical603) 35: 59 vif (Flow temperature 10⁻² °C)
+      (multical603) 36: * D014 T1 flow temperature (53.280000 °C)
+      (multical603) 38: 02 dif (16 Bit Integer/Binary Instantaneous value)
+      (multical603) 39: 5D vif (Return temperature 10⁻² °C)
+      (multical603) 3a: * 0009 T2 flow temperature (23.040000 °C)
+      (multical603) 3c: 04 dif (32 Bit Integer/Binary Instantaneous value)
+      (multical603) 3d: FF vif (Vendor extension)
+      (multical603) 3e: 22 vife (per hour)
+      (multical603) 3f: * 00000000 info codes ()
+
+      (supercom587) 00: 8e length (142 bytes)
+      (supercom587) 01: 44 dll-c (from meter SND_NR)
+      (supercom587) 02: b409 dll-mfct (BMT)
+      (supercom587) 04: 71493602 dll-id (02364971)
+      (supercom587) 08: 0b dll-version
+      (supercom587) 09: 0d dll-type (Heat/Cooling load meter)
+      (supercom587) 0a: 7a tpl-ci-field (EN 13757-3 Application Layer (short tplh))
+      (supercom587) 0b: b6 tpl-acc-field
+      (supercom587) 0c: 00 tpl-sts-field
+      (supercom587) 0d: 8005 tpl-cfg 0580 (AES_CBC_IV nb=8 cntn=0 ra=0 hc=0 )
+      (supercom587) 0f: 2f2f decrypt check bytes
+      (supercom587) 11: 0C dif (8 digit BCD Instantaneous value)
+      (supercom587) 12: 0E vif (Energy MJ)
+      (supercom587) 13: 00000000
+      (supercom587) 17: 04 dif (32 Bit Integer/Binary Instantaneous value)
+      (supercom587) 18: 6D vif (Date and time type)
+      (supercom587) 19: 112D872C
+      (supercom587) 1d: 0C dif (8 digit BCD Instantaneous value)
+      (supercom587) 1e: 13 vif (Volume l)
+      (supercom587) 1f: * 00000000 total consumption (0.000000 m3)
+      (supercom587) 23: 0C dif (8 digit BCD Instantaneous value)
+      (supercom587) 24: 0E vif (Energy MJ)
+      (supercom587) 25: 00000000
+      (supercom587) 29: 0C dif (8 digit BCD Instantaneous value)
+      (supercom587) 2a: 13 vif (Volume l)
+      (supercom587) 2b: 00000000
+      (supercom587) 2f: 0C dif (8 digit BCD Instantaneous value)
+      (supercom587) 30: 13 vif (Volume l)
+      (supercom587) 31: 00000000
+      (supercom587) 35: 0C dif (8 digit BCD Instantaneous value)
+      (supercom587) 36: 13 vif (Volume l)
+      (supercom587) 37: 00000000
+      (supercom587) 3b: 0A dif (4 digit BCD Instantaneous value)
+      (supercom587) 3c: 5A vif (Flow temperature 10⁻¹ °C)
+      (supercom587) 3d: 9400
+      (supercom587) 3f: 0A dif (4 digit BCD Instantaneous value)
+      (supercom587) 40: 5E vif (Return temperature 10⁻¹ °C)
+      (supercom587) 41: 9500
+      (supercom587) 43: 0F manufacturer specific data
+
+*/
+    int offset;
+    string key;
+
+    extractDVuint8(&t->values, "04FF22", &offset, &info_codes_);
+    t->addMoreExplanation(offset, " info codes (%s)", status().c_str());
+
+    extractDVuint32(&t->values, "04FF07", &offset, &energy_forward_kwh_);
+    t->addMoreExplanation(offset, " something A (%zu)", energy_forward_kwh_);
+
+    extractDVuint32(&t->values, "04FF08", &offset, &energy_returned_kwh_);
+    t->addMoreExplanation(offset, " something B (%zu)", energy_returned_kwh_);
+
+    if(findKey(MeasurementType::Instantaneous, ValueInformation::EnergyWh, 0, 0, &key, &t->values)) {
+        extractDVdouble(&t->values, key, &offset, &total_energy_kwh_);
+        t->addMoreExplanation(offset, " total energy consumption (%f kWh)", total_energy_kwh_);
+    }
+
+    if(findKey(MeasurementType::Instantaneous, ValueInformation::Volume, 0, 0, &key, &t->values)) {
+        extractDVdouble(&t->values, key, &offset, &total_volume_m3_);
+        t->addMoreExplanation(offset, " total volume (%f m3)", total_volume_m3_);
+    }
+
+    if(findKey(MeasurementType::Unknown, ValueInformation::VolumeFlow, 0, 0, &key, &t->values)) {
+        extractDVdouble(&t->values, key, &offset, &volume_flow_m3h_);
+        t->addMoreExplanation(offset, " volume flow (%f m3/h)", volume_flow_m3h_);
+    }
+
+    if(findKey(MeasurementType::Instantaneous, ValueInformation::FlowTemperature, 0, 0, &key, &t->values)) {
+        has_t1_temperature_ = extractDVdouble(&t->values, key, &offset, &t1_temperature_c_);
+        t->addMoreExplanation(offset, " T1 flow temperature (%f °C)", t1_temperature_c_);
+    }
+
+    if(findKey(MeasurementType::Instantaneous, ValueInformation::ReturnTemperature, 0, 0, &key, &t->values)) {
+        has_t2_temperature_ = extractDVdouble(&t->values, key, &offset, &t2_temperature_c_);
+        t->addMoreExplanation(offset, " T2 flow temperature (%f °C)", t2_temperature_c_);
+    }
+
+    if (findKey(MeasurementType::Unknown, ValueInformation::Date, 0, 0, &key, &t->values)) {
+        struct tm datetime;
+        extractDVdate(&t->values, key, &offset, &datetime);
+        target_date_ = strdatetime(&datetime);
+        t->addMoreExplanation(offset, " target date (%s)", target_date_.c_str());
+    }
+}
+
+string MeterHydrocalM3::status()
+{
+    string s;
+    if (info_codes_ & INFO_CODE_VOLTAGE_INTERRUPTED) s.append("VOLTAGE_INTERRUPTED ");
+    if (info_codes_ & INFO_CODE_LOW_BATTERY_LEVEL) s.append("LOW_BATTERY_LEVEL ");
+    if (info_codes_ & INFO_CODE_EXTERNAL_ALARM) s.append("EXTERNAL_ALARM ");
+    if (info_codes_ & INFO_CODE_SENSOR_T1_ABOVE_MEASURING_RANGE) s.append("SENSOR_T1_ABOVE_MEASURING_RANGE ");
+    if (info_codes_ & INFO_CODE_SENSOR_T2_ABOVE_MEASURING_RANGE) s.append("SENSOR_T2_ABOVE_MEASURING_RANGE ");
+    if (info_codes_ & INFO_CODE_SENSOR_T1_BELOW_MEASURING_RANGE) s.append("SENSOR_T1_BELOW_MEASURING_RANGE ");
+    if (info_codes_ & INFO_CODE_SENSOR_T2_BELOW_MEASURING_RANGE) s.append("SENSOR_T2_BELOW_MEASURING_RANGE ");
+    if (info_codes_ & INFO_CODE_TEMP_DIFF_WRONG_POLARITY) s.append("TEMP_DIFF_WRONG_POLARITY ");
+    if (s.length() > 0) {
+        s.pop_back(); // Remove final space
+        return s;
+    }
+    return s;
+}