Решение:
Прописать в Header.php
if (isset($this->request->get['information_id'])) {
$information_id = (int)$this->request->get['information_id'];
} else {
$information_id = 0;
}
$information_info = $this->model_catalog_information->getInformation($information_id);
if ($information_info) {
if ($information_info['meta_h1']) {
$data['heading_title'] = $information_info['meta_h1'];
} else {
$data['heading_title'] = $information_info['title'];
}
} else {
$data['heading_title'] = $this->language->get('text_error');
}
Выводим в Header.tpl
<h1><?php echo $heading_title; ?></h1>