diff --git a/esphome/components/binary_sensor/binary_sensor.h b/esphome/components/binary_sensor/binary_sensor.h
index ecf68de74c..591f444387 100644
--- a/esphome/components/binary_sensor/binary_sensor.h
+++ b/esphome/components/binary_sensor/binary_sensor.h
@@ -74,8 +74,10 @@ class BinarySensor : public EntityBase {
 
   // ========== OVERRIDE METHODS ==========
   // (You'll only need this when creating your own custom binary sensor)
-  /// Get the default device class for this sensor, or empty string for no default.
-  ESPDEPRECATED("device_class() is deprecated, set property during config validation instead.", "2022.01")
+  /** Override this to set the default device class.
+   *
+   * @deprecated This method is deprecated, set the property during config validation instead. (2022.1)
+   */
   virtual std::string device_class();
 
  protected:
diff --git a/esphome/components/cover/cover.h b/esphome/components/cover/cover.h
index 779e4a2a46..1b5d3a8fa1 100644
--- a/esphome/components/cover/cover.h
+++ b/esphome/components/cover/cover.h
@@ -169,7 +169,11 @@ class Cover : public EntityBase {
   friend CoverCall;
 
   virtual void control(const CoverCall &call) = 0;
-  ESPDEPRECATED("device_class() is deprecated, set property during config validation instead.", "2022.01")
+
+  /** Override this to set the default device class.
+   *
+   * @deprecated This method is deprecated, set the property during config validation instead. (2022.1)
+   */
   virtual std::string device_class();
 
   optional<CoverRestoreState> restore_state_();
diff --git a/esphome/components/esp32/__init__.py b/esphome/components/esp32/__init__.py
index 161803eaf4..8214886f8c 100644
--- a/esphome/components/esp32/__init__.py
+++ b/esphome/components/esp32/__init__.py
@@ -417,7 +417,7 @@ def copy_files():
         )
 
     dir = os.path.dirname(__file__)
-    post_build_file = os.path.join(dir, "post_build.py")
+    post_build_file = os.path.join(dir, "post_build.py.script")
     copy_file_if_changed(
         post_build_file,
         CORE.relative_build_path("post_build.py"),
diff --git a/esphome/components/esp32/post_build.py b/esphome/components/esp32/post_build.py.script
similarity index 100%
rename from esphome/components/esp32/post_build.py
rename to esphome/components/esp32/post_build.py.script
diff --git a/esphome/components/esp8266/__init__.py b/esphome/components/esp8266/__init__.py
index 34a4a2fadb..7182042770 100644
--- a/esphome/components/esp8266/__init__.py
+++ b/esphome/components/esp8266/__init__.py
@@ -220,7 +220,7 @@ async def to_code(config):
 def copy_files():
 
     dir = os.path.dirname(__file__)
-    post_build_file = os.path.join(dir, "post_build.py")
+    post_build_file = os.path.join(dir, "post_build.py.script")
     copy_file_if_changed(
         post_build_file,
         CORE.relative_build_path("post_build.py"),
diff --git a/esphome/components/esp8266/post_build.py b/esphome/components/esp8266/post_build.py.script
similarity index 100%
rename from esphome/components/esp8266/post_build.py
rename to esphome/components/esp8266/post_build.py.script
diff --git a/esphome/components/sensor/sensor.h b/esphome/components/sensor/sensor.h
index 794aecca95..d31fe9d834 100644
--- a/esphome/components/sensor/sensor.h
+++ b/esphome/components/sensor/sensor.h
@@ -150,20 +150,28 @@ class Sensor : public EntityBase {
   void internal_send_state_to_frontend(float state);
 
  protected:
-  /// Override this to set the default unit of measurement.
-  ESPDEPRECATED("unit_of_measurement() is deprecated, set property during config validation instead.", "2022.01")
+  /** Override this to set the default unit of measurement.
+   *
+   * @deprecated This method is deprecated, set the property during config validation instead. (2022.1)
+   */
   virtual std::string unit_of_measurement();  // NOLINT
 
-  /// Override this to set the default accuracy in decimals.
-  ESPDEPRECATED("accuracy_decimals() is deprecated, set property during config validation instead.", "2022.01")
+  /** Override this to set the default accuracy in decimals.
+   *
+   * @deprecated This method is deprecated, set the property during config validation instead. (2022.1)
+   */
   virtual int8_t accuracy_decimals();  // NOLINT
 
-  /// Override this to set the default device class.
-  ESPDEPRECATED("device_class() is deprecated, set property during config validation instead.", "2022.01")
+  /** Override this to set the default device class.
+   *
+   * @deprecated This method is deprecated, set the property during config validation instead. (2022.1)
+   */
   virtual std::string device_class();  // NOLINT
 
-  /// Override this to set the default state class.
-  ESPDEPRECATED("state_class() is deprecated, set property during config validation instead.", "2022.01")
+  /** Override this to set the default state class.
+   *
+   * @deprecated This method is deprecated, set the property during config validation instead. (2022.1)
+   */
   virtual StateClass state_class();  // NOLINT
 
   uint32_t hash_base() override;
diff --git a/esphome/components/web_server/web_server.cpp b/esphome/components/web_server/web_server.cpp
index 4cc77da256..7413af67c4 100644
--- a/esphome/components/web_server/web_server.cpp
+++ b/esphome/components/web_server/web_server.cpp
@@ -236,7 +236,18 @@ void WebServer::handle_index_request(AsyncWebServerRequest *request) {
 #ifdef USE_NUMBER
   for (auto *obj : App.get_numbers())
     if (this->include_internal_ || !obj->is_internal())
-      write_row(stream, obj, "number", "");
+      write_row(stream, obj, "number", "", [](AsyncResponseStream &stream, EntityBase *obj) {
+        number::Number *number = (number::Number *) obj;
+        stream.print(R"(<input type="number" min=")");
+        stream.print(number->traits.get_min_value());
+        stream.print(R"(" max=")");
+        stream.print(number->traits.get_max_value());
+        stream.print(R"(" step=")");
+        stream.print(number->traits.get_step());
+        stream.print(R"(" value=")");
+        stream.print(number->state);
+        stream.print(R"("/>)");
+      });
 #endif
 
 #ifdef USE_SELECT
@@ -652,8 +663,29 @@ void WebServer::handle_number_request(AsyncWebServerRequest *request, const UrlM
   for (auto *obj : App.get_numbers()) {
     if (obj->get_object_id() != match.id)
       continue;
-    std::string data = this->number_json(obj, obj->state);
-    request->send(200, "text/json", data.c_str());
+
+    if (request->method() == HTTP_GET) {
+      std::string data = this->number_json(obj, obj->state);
+      request->send(200, "text/json", data.c_str());
+      return;
+    }
+
+    if (match.method != "set") {
+      request->send(404);
+      return;
+    }
+
+    auto call = obj->make_call();
+
+    if (request->hasParam("value")) {
+      String value = request->getParam("value")->value();
+      optional<float> value_f = parse_number<float>(value.c_str());
+      if (value_f.has_value())
+        call.set_value(*value_f);
+    }
+
+    this->defer([call]() mutable { call.perform(); });
+    request->send(200);
     return;
   }
   request->send(404);
@@ -661,9 +693,8 @@ void WebServer::handle_number_request(AsyncWebServerRequest *request, const UrlM
 std::string WebServer::number_json(number::Number *obj, float value) {
   return json::build_json([obj, value](JsonObject root) {
     root["id"] = "number-" + obj->get_object_id();
-    char buffer[64];
-    snprintf(buffer, sizeof(buffer), "%f", value);
-    root["state"] = buffer;
+    std::string state = str_sprintf("%f", value);
+    root["state"] = state;
     root["value"] = value;
   });
 }
@@ -769,7 +800,7 @@ bool WebServer::canHandle(AsyncWebServerRequest *request) {
 #endif
 
 #ifdef USE_NUMBER
-  if (request->method() == HTTP_GET && match.domain == "number")
+  if ((request->method() == HTTP_POST || request->method() == HTTP_GET) && match.domain == "number")
     return true;
 #endif
 
diff --git a/esphome/const.py b/esphome/const.py
index daa61ebd9b..9005cc927a 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1,6 +1,6 @@
 """Constants used by esphome."""
 
-__version__ = "2022.1.0b2"
+__version__ = "2022.1.0b3"
 
 ALLOWED_NAME_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789-_"
 
diff --git a/esphome/dashboard/dashboard.py b/esphome/dashboard/dashboard.py
index f9ae3a4fc8..c68d037fe6 100644
--- a/esphome/dashboard/dashboard.py
+++ b/esphome/dashboard/dashboard.py
@@ -445,6 +445,7 @@ class DownloadBinaryRequestHandler(BaseHandler):
 
         self.set_header("Content-Type", "application/octet-stream")
         self.set_header("Content-Disposition", f'attachment; filename="{filename}"')
+        self.set_header("Cache-Control", "no-cache")
         if not Path(path).is_file():
             self.send_error(404)
             return