diff --git a/data/index.html b/data/index.html
index ae9b4a8..d431514 100644
--- a/data/index.html
+++ b/data/index.html
@@ -206,6 +206,21 @@
                 <th scope="row">Exhaust temp:</th>
                 <td><b class="exhaust-temp"></b> <span class="temp-unit"></span></td>
               </tr>
+
+              <!-- Diag -->
+              <tr>
+                <th scope="row">Slave parameters:</th>
+                <td>
+                  <pre><b>Vendor:</b>          <span class="slave-vendor"></span>
+<b>Member ID:</b>       <span class="slave-member-id"></span>
+<b>Flags:</b>           <span class="slave-flags"></span>
+<b>Type:</b>            <span class="slave-type"></span>
+<b>Version:</b>         <span class="slave-version"></span>
+<b>OT version:</b>      <span class="slave-ot-version"></span>
+<b>Heating limits:</b>  <span class="heating-min-temp"></span>...<span class="heating-max-temp"></span> <span class="temp-unit"></span>
+<b>DHW limits:</b>      <span class="dhw-min-temp"></span>...<span class="dhw-max-temp"></span> <span class="temp-unit"></span></pre>
+                </td>
+              </tr>
             </tbody>
           </table>
         </div>
diff --git a/data/static/app.js.gz b/data/static/app.js.gz
index c1dc8fe..1b62381 100644
Binary files a/data/static/app.js.gz and b/data/static/app.js.gz differ
diff --git a/src/OpenThermTask.h b/src/OpenThermTask.h
index 304e8fe..4a4922c 100644
--- a/src/OpenThermTask.h
+++ b/src/OpenThermTask.h
@@ -425,6 +425,13 @@ protected:
       Log.swarningln(FPSTR(L_OT), F("Set master version failed"));
     }
 
+    if (this->updateSlaveOtVersion()) {
+      Log.straceln(FPSTR(L_OT), F("Slave OT version: %f"), vars.parameters.slaveOtVersion);
+
+    } else {
+      Log.swarningln(FPSTR(L_OT), F("Get slave OT version failed"));
+    }
+
     if (this->updateSlaveConfig()) {
       Log.straceln(FPSTR(L_OT), F("Slave member id: %u, flags: %u"), vars.parameters.slaveMemberId, vars.parameters.slaveFlags);
 
diff --git a/src/utils.h b/src/utils.h
index 991b18b..3064355 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1137,6 +1137,12 @@ void varsToJson(const Variables& src, JsonVariant dst) {
   dst["parameters"]["heatingSetpoint"] = src.parameters.heatingSetpoint;
   dst["parameters"]["dhwMinTemp"] = src.parameters.dhwMinTemp;
   dst["parameters"]["dhwMaxTemp"] = src.parameters.dhwMaxTemp;
+
+  dst["parameters"]["slaveMemberId"] = src.parameters.slaveMemberId;
+  dst["parameters"]["slaveFlags"] = src.parameters.slaveFlags;
+  dst["parameters"]["slaveType"] = src.parameters.slaveType;
+  dst["parameters"]["slaveVersion"] = src.parameters.slaveVersion;
+  dst["parameters"]["slaveOtVersion"] = src.parameters.slaveOtVersion;
 }
 
 bool jsonToVars(const JsonVariantConst src, Variables& dst) {
diff --git a/src_data/static/app.js b/src_data/static/app.js
index f7063b8..0af1818 100644
--- a/src_data/static/app.js
+++ b/src_data/static/app.js
@@ -575,11 +575,24 @@ async function loadVars() {
   setValue('.indoor-temp', result.temperatures.indoor);
   setValue('.outdoor-temp', result.temperatures.outdoor);
   setValue('.heating-temp', result.temperatures.heating);
-  setValue('.heating-setpoint-temp', result.parameters.heatingSetpoint);
   setValue('.heating-return-temp', result.temperatures.heatingReturn);
   setValue('.dhw-temp', result.temperatures.dhw);
   setValue('.exhaust-temp', result.temperatures.exhaust);
 
+  setValue('.heating-min-temp', result.parameters.heatingMinTemp);
+  setValue('.heating-max-temp', result.parameters.heatingMaxTemp);
+  setValue('.heating-setpoint-temp', result.parameters.heatingSetpoint);
+  setValue('.dhw-min-temp', result.parameters.dhwMinTemp);
+  setValue('.dhw-max-temp', result.parameters.dhwMaxTemp);
+
+  setValue('.slave-member-id', result.parameters.slaveMemberId);
+  setValue('.slave-vendor', memberIdToVendor(result.parameters.slaveMemberId));
+  
+  setValue('.slave-flags', result.parameters.slaveFlags);
+  setValue('.slave-type', result.parameters.slaveType);
+  setValue('.slave-version', result.parameters.slaveVersion);
+  setValue('.slave-ot-version', result.parameters.slaveOtVersion);
+
   setBusy('.ot-busy', '.ot-table', false);
 
   setValue('.temp-unit', tempUnitStr);
@@ -670,6 +683,36 @@ function setInputValue(selector, value) {
 }
 
 
+function memberIdToVendor(memberId) {
+  // https://github.com/Jeroen88/EasyOpenTherm/blob/main/src/EasyOpenTherm.h
+  // https://github.com/Evgen2/SmartTherm/blob/v0.7/src/Web.cpp
+  const vendorList = {
+    1:    "Baxi Fourtech/Luna 3",
+    2:    "AWB/Brink",
+    4:    "ATAG/Brötje/ELCO/GEMINOX",
+    5:    "Itho Daalderop",
+    6:    "IDEAL",
+    8:    "Buderus/Bosch/Hoval",
+    9:    "Ferroli",
+    11:   "Remeha/De Dietrich",
+    16:   "Unical",
+    24:   "Vaillant/Bulex",
+    27:   "Baxi",
+    29:   "Itho Daalderop",
+    33:   "Viessmann",
+    56:   "Baxi Luna Duo-Tec",
+    131:  "Nefit",
+    148:  "Navien",
+    173:  "Intergas",
+    247:  "Baxi Ampera",
+    248:  "Zota Lux-X"
+  };
+  
+  return (memberId in vendorList) 
+    ? vendorList[memberId] 
+    : "unknown vendor";
+}
+
 function form2json(data) {
   let method = function (object, pair) {
     let keys = pair[0].replace(/\]/g, '').split('[');