diff --git a/lib/API/JSON/v1/Newsletters.php b/lib/API/JSON/v1/Newsletters.php
index 3a84f76368..e5f6d5ae77 100644
--- a/lib/API/JSON/v1/Newsletters.php
+++ b/lib/API/JSON/v1/Newsletters.php
@@ -9,6 +9,7 @@ use MailPoet\API\JSON\ResponseBuilders\NewslettersResponseBuilder;
 use MailPoet\Config\AccessControl;
 use MailPoet\Cron\CronHelper;
 use MailPoet\Cron\Workers\SendingQueue\Tasks\Newsletter as NewsletterQueueTask;
+use MailPoet\DI\ContainerWrapper;
 use MailPoet\Listing;
 use MailPoet\Mailer\Mailer as MailerFactory;
 use MailPoet\Mailer\MetaInfo;
@@ -16,7 +17,6 @@ use MailPoet\Models\Newsletter;
 use MailPoet\Models\NewsletterOption;
 use MailPoet\Models\NewsletterOptionField;
 use MailPoet\Models\NewsletterSegment;
-use MailPoet\Models\NewsletterTemplate;
 use MailPoet\Models\SendingQueue;
 use MailPoet\Models\Subscriber;
 use MailPoet\Newsletter\Listing\NewsletterListingRepository;
@@ -25,6 +25,7 @@ use MailPoet\Newsletter\Renderer\Renderer;
 use MailPoet\Newsletter\Scheduler\PostNotificationScheduler;
 use MailPoet\Newsletter\Scheduler\Scheduler;
 use MailPoet\Newsletter\Url as NewsletterUrl;
+use MailPoet\NewsletterTemplates\NewsletterTemplatesRepository;
 use MailPoet\Services\AuthorizedEmailsController;
 use MailPoet\Settings\SettingsController;
 use MailPoet\Tasks\Sending as SendingTask;
@@ -183,9 +184,9 @@ class Newsletters extends APIEndpoint {
     }
 
     if (!empty($data['template_id'])) {
-      $template = NewsletterTemplate::whereEqual('id', $data['template_id'])->findOne();
-      if ($template instanceof NewsletterTemplate) {
-        $data['body'] = $template->body;
+      $template = ContainerWrapper::getInstance()->get(NewsletterTemplatesRepository::class)->findOneById($data['template_id']);
+      if ($template) {
+        $data['body'] = json_encode($template->getBody());
       }
       unset($data['template_id']);
     }
@@ -582,9 +583,9 @@ class Newsletters extends APIEndpoint {
     } else {
       // try to load template data
       $templateId = (isset($data['template']) ? (int)$data['template'] : false);
-      $template = NewsletterTemplate::findOne($templateId);
-      if ($template instanceof NewsletterTemplate) {
-        $newsletter->body = $template->body;
+      $template = ContainerWrapper::getInstance()->get(NewsletterTemplatesRepository::class)->findOneById($templateId);
+      if ($template) {
+        $newsletter->body = json_encode($template->getBody());
       } else {
         $newsletter->body = [];
       }
diff --git a/lib/Models/NewsletterTemplate.php b/lib/Models/NewsletterTemplate.php
deleted file mode 100644
index 8a8552841a..0000000000
--- a/lib/Models/NewsletterTemplate.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-
-namespace MailPoet\Models;
-
-use MailPoet\WP\Functions as WPFunctions;
-
-/**
- * @property string $name
- * @property int|null $newsletterId
- * @property string $categories
- * @property string $description
- * @property string|null $body
- * @property string|null $thumbnail
- * @property int|null $readonly
- */
-class NewsletterTemplate extends Model {
-  public static $_table = MP_NEWSLETTER_TEMPLATES_TABLE; // phpcs:ignore PSR2.Classes.PropertyDeclaration
-
-  const RECENTLY_SENT_CATEGORIES = '["recent"]';
-  const RECENTLY_SENT_COUNT = 12;
-
-  public function __construct() {
-    parent::__construct();
-
-    $this->addValidations('name', [
-      'required' => WPFunctions::get()->__('Please specify a name.', 'mailpoet'),
-    ]);
-    $this->addValidations('body', [
-      'required' => WPFunctions::get()->__('The template body cannot be empty.', 'mailpoet'),
-    ]);
-  }
-}