列島ボイラーは単純温水機能だけあるか?
<iframe width="1280" height="720" src="https://www.youtube.com/embed/wylyefLyRI4" title="内臓型油ボイラーを計りました." frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
<iframe width="1280" height="720" src="https://www.youtube.com/embed/2_p0FduXacg" title="ボイラー選手誌が設置して上げるガスボイラー設置過程!" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>