diff --git a/src/command.cpp b/src/command.cpp
index 8f2b489ad..220b69006 100644
--- a/src/command.cpp
+++ b/src/command.cpp
@@ -247,10 +247,13 @@ uint8_t Command::call(const uint8_t device_type, const char * cmd, const char *
 // id may be used to represent a heating circuit for example
 // returns 0 if the command errored, 1 (TRUE) if ok, 2 if not found, 3 if error or 4 if not allowed
 uint8_t Command::call(const uint8_t device_type, const char * cmd, const char * value, const bool is_admin, const int8_t id, JsonObject & output) {
+    if (cmd == nullptr) {
+        return CommandRet::NOT_FOUND;
+    }
     uint8_t return_code = CommandRet::OK;
 
     auto    dname     = EMSdevice::device_type_2_device_name(device_type);
-    uint8_t device_id = EMSESP::device_id_from_cmd(device_type, id, cmd);
+    uint8_t device_id = EMSESP::device_id_from_cmd(device_type, cmd, id);
 
     // see if there is a command registered
     auto cf = find_command(device_type, device_id, cmd);
diff --git a/src/devices/boiler.cpp b/src/devices/boiler.cpp
index 658936393..e89373ee0 100644
--- a/src/devices/boiler.cpp
+++ b/src/devices/boiler.cpp
@@ -614,6 +614,13 @@ Boiler::Boiler(uint8_t device_type, int8_t device_id, uint8_t product_id, const
                               MAKE_CF_CB(set_hpHystPool),
                               50,
                               1500);
+        register_device_value(DeviceValueTAG::TAG_DEVICE_DATA,
+                              &silentMode_,
+                              DeviceValueType::ENUM,
+                              FL_(enum_silentMode),
+                              FL_(silentMode),
+                              DeviceValueUOM::NONE,
+                              MAKE_CF_CB(set_silentMode));
         register_device_value(DeviceValueTAG::TAG_DEVICE_DATA,
                               &minTempSilent_,
                               DeviceValueType::INT,
@@ -1571,6 +1578,7 @@ void Boiler::process_amExtraMessage(std::shared_ptr<const Telegram> telegram) {
 // Boiler(0x08) -> All(0x00), ?(0x0484), data: 00 00 14 28 0D 50 00 00 00 02 02 07 28 01 00 02 05 19 0A 0A 03 0D 07 00 0A
 // Boiler(0x08) -> All(0x00), ?(0x0484), data: 01 90 00 F6 28 14 64 00 00 E1 00 1E 00 1E 01 64 01 64 54 20 00 00 (offset 25)
 void Boiler::process_HpSilentMode(std::shared_ptr<const Telegram> telegram) {
+    has_update(telegram, silentMode_, 10); // enum off-auto-on
     has_update(telegram, minTempSilent_, 11);
     has_update(telegram, hpHystHeat_, 37); // is / 5
     has_update(telegram, hpHystCool_, 35); // is / 5, maybe offset swapped with pool
@@ -2547,6 +2555,15 @@ bool Boiler::set_maxHeat(const char * value, const int8_t id) {
     return true;
 }
 
+bool Boiler::set_silentMode(const char * value, const int8_t id) {
+    uint8_t v;
+    if (!Helpers::value2enum(value, v, FL_(enum_silentMode))) {
+        return false;
+    }
+    write_command(0x484, 10, v, 0x484);
+    return true;
+}
+
 bool Boiler::set_minTempSilent(const char * value, const int8_t id) {
     int v;
     if (Helpers::value2temperature(value, v)) {
diff --git a/src/devices/boiler.h b/src/devices/boiler.h
index aa6c30879..ecd0a7d43 100644
--- a/src/devices/boiler.h
+++ b/src/devices/boiler.h
@@ -247,6 +247,7 @@ class Boiler : public EMSdevice {
     uint8_t  auxHeaterOff_;
     uint8_t  auxHeaterStatus_;
     uint16_t auxHeaterDelay_;
+    uint8_t  silentMode_;
     int8_t   minTempSilent_;
     int8_t   tempParMode_;
     int8_t   auxHeatMixValve_;
@@ -401,6 +402,7 @@ class Boiler : public EMSdevice {
     inline bool set_maxHeatDhw(const char * value, const int8_t id) {
         return set_maxHeat(value, 4);
     }
+    bool set_silentMode(const char * value, const int8_t id);
     bool set_minTempSilent(const char * value, const int8_t id);
     bool set_additionalHeaterOnly(const char * value, const int8_t id);
     bool set_additionalHeater(const char * value, const int8_t id);
diff --git a/src/emsdevice.cpp b/src/emsdevice.cpp
index c02841e77..58176d889 100644
--- a/src/emsdevice.cpp
+++ b/src/emsdevice.cpp
@@ -274,7 +274,7 @@ bool EMSdevice::has_tag(const uint8_t tag) const {
 }
 
 // check if the device has a command on the with this tag.
-bool EMSdevice::has_cmd(const int8_t id, const char * cmd) const {
+bool EMSdevice::has_cmd(const char * cmd, const int8_t id) const {
     uint8_t tag = DeviceValueTAG::TAG_HC1 + id - 1;
     for (const auto & dv : devicevalues_) {
         if ((id < 1 || dv.tag == tag) && dv.has_cmd && strcmp(dv.short_name, cmd) == 0) {
diff --git a/src/emsdevice.h b/src/emsdevice.h
index ee8a447b6..dde3da85c 100644
--- a/src/emsdevice.h
+++ b/src/emsdevice.h
@@ -53,7 +53,7 @@ class EMSdevice {
     static std::string  tag_to_mqtt(uint8_t tag);
 
     bool has_tag(const uint8_t tag) const;
-    bool has_cmd(const int8_t id, const char * cmd) const;
+    bool has_cmd(const char * cmd, const int8_t id) const;
 
     inline uint8_t device_id() const {
         return device_id_;
diff --git a/src/emsesp.cpp b/src/emsesp.cpp
index b14eab24b..be7aeea5c 100644
--- a/src/emsesp.cpp
+++ b/src/emsesp.cpp
@@ -114,9 +114,9 @@ bool EMSESP::cmd_is_readonly(const uint8_t device_type, const uint8_t device_id,
     return false;
 }
 
-uint8_t EMSESP::device_id_from_cmd(const uint8_t device_type, const int8_t id, const char * cmd) {
+uint8_t EMSESP::device_id_from_cmd(const uint8_t device_type, const char * cmd, const int8_t id) {
     for (const auto & emsdevice : emsdevices) {
-        if (emsdevice && emsdevice->device_type() == device_type && emsdevice->has_cmd(id, cmd)) {
+        if (emsdevice && emsdevice->device_type() == device_type && emsdevice->has_cmd(cmd, id)) {
             return emsdevice->device_id();
         }
     }
diff --git a/src/emsesp.h b/src/emsesp.h
index 82ce58c5a..f5fcf8214 100644
--- a/src/emsesp.h
+++ b/src/emsesp.h
@@ -131,7 +131,7 @@ class EMSESP {
     static bool device_exists(const uint8_t device_id);
     static bool cmd_is_readonly(const uint8_t device_type, const uint8_t device_id, const char * cmd, const int8_t id);
 
-    static uint8_t device_id_from_cmd(const uint8_t device_type, const int8_t id, const char * cmd);
+    static uint8_t device_id_from_cmd(const uint8_t device_type, const char * cmd, const int8_t id);
     static uint8_t count_devices(const uint8_t device_type);
     static uint8_t count_devices();
     static uint8_t device_index(const uint8_t device_type, const uint8_t unique_id);
diff --git a/src/locale_common.h b/src/locale_common.h
index 2b757d513..65764dc6a 100644
--- a/src/locale_common.h
+++ b/src/locale_common.h
@@ -310,6 +310,7 @@ MAKE_PSTR_ENUM(enum_lowNoiseMode, FL_(off), FL_(reduced_output), FL_(switchoff),
 
 // heat pump
 MAKE_PSTR_ENUM(enum_hpactivity, FL_(none), FL_(heating), FL_(cooling), FL_(hot_water), FL_(pool), FL_(unknown), FL_(defrost))
+MAKE_PSTR_ENUM(enum_silentMode, FL_(off), FL_(auto), FL_(on))
 
 // solar
 MAKE_PSTR_ENUM(enum_solarmode, FL_(constant), FL_(pwm), FL_(analog))
diff --git a/src/locale_translations.h b/src/locale_translations.h
index ef03629a7..4d0cdde5c 100644
--- a/src/locale_translations.h
+++ b/src/locale_translations.h
@@ -373,6 +373,7 @@ MAKE_PSTR_LIST(auxHeaterOff, "auxheateroff", "disable auxilliary heater", "Verbi
 MAKE_PSTR_LIST(auxHeaterStatus, "auxheaterstatus", "auxilliary heater status", "Status Zusatzheizer", "Bijverwarming", "", "status dogrzewacza", "", "Chauffage auxiliaire")
 MAKE_PSTR_LIST(auxHeaterOnly, "auxheateronly", "auxilliary heater only", "nur Zusatzheizer","Alleen bijverwarming", "", "tylko dogrzewacz", "", "Que chauffage auxiliaire")
 MAKE_PSTR_LIST(auxHeaterDelay, "auxheaterdelay", "auxilliary heater on delay", "Zusatzheizer verzögert ein", "Bijverw. vertraagd aan", "Tillskottfördröjning på", "opóźnienie włączania dogrzewacza", "Tilleggsvarmer forsinket på", "Chauff app tempo marche")
+MAKE_PSTR_LIST(silentMode, "silentmode", "silent mode", "Silentmodus", " Stiller gebruik", "", "trybu cichego", "", "Fct silencieux")
 MAKE_PSTR_LIST(minTempSilent, "mintempsilent", "min. outside temp. for silent mode", "Minimale Aussentemperatur Silentmodus", " Stiller gebruik min. buitentemp", "", "minimalna temperatura zewnętrzna dla trybu cichego", "", "Fct silencieux: Temp. extérieure min.")
 MAKE_PSTR_LIST(tempParMode, "tempparmode", "outside temp. parallel mode", "Aussentemperatur Parallelmodus", "Buitentemp. parallelbedr", "", "maksymalna temperatura zewnętrzna dla dogrzewacza", "", "Temp. ext. fct parallèle")
 MAKE_PSTR_LIST(auxHeatMixValve, "auxheatmix", "aux. heater mixing valve", "Mischer Zusatzheizer", "Bijverwarming menger", "", "mieszacz dogrzewacza", "", "Chauffage auxiliaire mélangeur")
diff --git a/src/web/WebAPIService.cpp b/src/web/WebAPIService.cpp
index 5fe1a40d2..1fc33e827 100644
--- a/src/web/WebAPIService.cpp
+++ b/src/web/WebAPIService.cpp
@@ -101,14 +101,12 @@ void WebAPIService::parse(AsyncWebServerRequest * request, JsonObject & input) {
     }
 
     // output json buffer
-    auto * response = new PrettyAsyncJsonResponse(false, EMSESP_JSON_SIZE_XXLARGE_DYN);
-    if (!response->getSize()) {
+    size_t buffer   = EMSESP_JSON_SIZE_XXLARGE_DYN;
+    auto * response = new PrettyAsyncJsonResponse(false, buffer);
+    while (!response->getSize()) {
         delete response;
-        response = new PrettyAsyncJsonResponse(false, 256);
-        response->setCode(507); // Insufficient Storage
-        response->setLength();
-        request->send(response);
-        return;
+        buffer -= 1024;
+        response = new PrettyAsyncJsonResponse(false, buffer);
     }
     JsonObject output = response->getRoot();
 
diff --git a/src/web/WebCustomizationService.cpp b/src/web/WebCustomizationService.cpp
index 5b2289d64..94faa8ef7 100644
--- a/src/web/WebCustomizationService.cpp
+++ b/src/web/WebCustomizationService.cpp
@@ -200,14 +200,12 @@ void WebCustomizationService::devices(AsyncWebServerRequest * request) {
 // send back list of device entities
 void WebCustomizationService::device_entities(AsyncWebServerRequest * request, JsonVariant & json) {
     if (json.is<JsonObject>()) {
-        auto * response = new MsgpackAsyncJsonResponse(true, EMSESP_JSON_SIZE_XXXLARGE_DYN);
-        if (!response->getSize()) {
+        size_t buffer   = EMSESP_JSON_SIZE_XXXLARGE_DYN;
+        auto * response = new MsgpackAsyncJsonResponse(true, buffer);
+        while (!response->getSize()) {
             delete response;
-            response = new MsgpackAsyncJsonResponse(true, 256);
-            response->setCode(507); // Insufficient Storage
-            response->setLength();
-            request->send(response);
-            return;
+            buffer -= 1024;
+            response = new MsgpackAsyncJsonResponse(true, buffer);
         }
         for (const auto & emsdevice : EMSESP::emsdevices) {
             if (emsdevice->unique_id() == json["id"]) {
diff --git a/src/web/WebDataService.cpp b/src/web/WebDataService.cpp
index e5187f69e..fc042558f 100644
--- a/src/web/WebDataService.cpp
+++ b/src/web/WebDataService.cpp
@@ -165,14 +165,12 @@ void WebDataService::sensor_data(AsyncWebServerRequest * request) {
 // Compresses the JSON using MsgPack https://msgpack.org/index.html
 void WebDataService::device_data(AsyncWebServerRequest * request, JsonVariant & json) {
     if (json.is<JsonObject>()) {
-        auto * response = new MsgpackAsyncJsonResponse(false, EMSESP_JSON_SIZE_XXXLARGE_DYN);
-        if (!response->getSize()) {
+        size_t buffer   = EMSESP_JSON_SIZE_XXXLARGE_DYN;
+        auto * response = new MsgpackAsyncJsonResponse(false, buffer);
+        while (!response->getSize()) {
             delete response;
-            response = new MsgpackAsyncJsonResponse(false, 256);
-            response->setCode(507); // Insufficient Storage
-            response->setLength();
-            request->send(response);
-            return;
+            buffer -= 1024;
+            response = new MsgpackAsyncJsonResponse(false, buffer);
         }
         for (const auto & emsdevice : EMSESP::emsdevices) {
             if (emsdevice->unique_id() == json["id"]) {