Magento 2: How to get a thumbnail image from a product

This is the simplist wat to get a product image thumbnail

Awaiting the correct way but for now this feels goods

$imagewidth = $imageheight = 250; $imageUrl = $this->helper('Magento\Catalog\Helper\Image') ->init($currentproduct, 'product_page_image_large') ->setImageFile($currentproduct->getFile()) ->getUrl();

Source: Stackoverflow get a product image from product model Magento 2