Is is true `<h1>` tag should not have more than 1 on every page for SEO? 

Every pages on the header, it includes and `<h1>` tag. Website Name which show an image from `logo class`, like this:

```
<div id="header">
  <h1 class="logo">
     <a href="#">Website Name</a>
  </h1>
</div>

```

and I also include `<h1>` on the contact page, help, etc and article page for example:

```
<h1>Contact Us</h1>
<h1>Name of the Article Title here</h1>

```

On the homepage, it just has one `<h1>` for the logo Site Name... other pages have 2 `<h1>` tags