_partial.html.twig

<h4>This is row {{ i }}</h4>

Controller.php

/**
 * @Route("/for", name="for")
 */
public function forAction(Request $request)
{
    return $this->render(
        $request->query->has('embed')
        ? 'default/for_embed.html.twig'
        : 'default/for_include.html.twig'
    );
}

public function partialAction(int $i)
{
    return $this->render('default/_partial.html.twig', [
        'i' => $i,
    ]);
}

for_embed.html.twig

{% extends 'base.html.twig' %}

{% block body %}
    {% for i in 0..25 %}
        {{ render(controller('AppBundle:Default:partial', { i: i })) }}
    {% endfor %}
{% endblock %}

for_include.html.twig

{% extends 'base.html.twig' %}

{% block body %}
    {% for i in 0..25 %}
        {% include 'default/_partial.html.twig' %}
    {% endfor %}
{% endblock %}