{"id":2348,"date":"2026-04-21T19:38:33","date_gmt":"2026-04-21T17:38:33","guid":{"rendered":"https:\/\/caldo-heizkoerper.de\/bathroom-radiators-for-renovation-these-connection-dimensions-are-important\/"},"modified":"2026-04-21T19:38:59","modified_gmt":"2026-04-21T17:38:59","slug":"bathroom-radiators-for-renovation-these-connection-dimensions-are-important","status":"publish","type":"post","link":"https:\/\/caldo-heizkoerper.de\/en\/bathroom-radiators-for-renovation-these-connection-dimensions-are-important\/","title":{"rendered":"Bathroom radiators for renovation: these connection dimensions are important"},"content":{"rendered":"<h2>Bathroom renovation: why dimensions are so important<\/h2>\n<p>If you want to replace your old bathroom radiator, you quickly come up against a crucial question: what dimensions must the new radiator have so that the existing connections can still be used? If you don&#8217;t answer this question carefully, you risk expensive follow-up work, raised tiles and unnecessarily long installation times. <\/p>\n<p>The good news: with the right preparation and the right radiator, replacements in existing buildings can often be carried out cleanly, quickly and without damaging the existing wall surfaces.<\/p>\n<h2>The two decisive dimensions when replacing radiators<\/h2>\n<p>Two dimensions are decisive for replacement in existing buildings:<\/p>\n<ul>\n<li><strong>Hub distance (NA):<\/strong> The horizontal distance from the center of the flow connection to the center of the return connection. For old panel radiators and radiators, this distance is standardized and is often 50 millimetres, but can vary depending on the model and year of manufacture. Measure this dimension precisely before ordering a new radiator.  <\/li>\n<li><strong>Bottom edge distance to the middle of the return (UA):<\/strong> The vertical distance from the bottom edge of the radiator to the middle of the return connection. This dimension determines how high the new radiator must be mounted above the floor connection so that the existing pipe routing fits. <\/li>\n<\/ul>\n<p>If you record both dimensions correctly, you can order a renovation radiator that is precisely tailored to the existing situation without having to lay pipes or open up tiles.<\/p>\n<blockquote><p><a title=\"Request further information now.\" href=\"https:\/\/caldo-heizkoerper.de\/en\/contact\/\">Get more information now.<\/a><\/p><\/blockquote>\n<h2>The Evelino renovation radiator: Tailor-made for existing buildings<\/h2>\n<p>Caldo has developed the <a title=\"Evelino renovation radiators from Caldo\" href=\"\/produkt\/evelino-renovierungsheizkoerper\/\">Evelino renovation radiator<\/a> for precisely this situation. It is manufactured individually according to your specifications and is designed to have the same connection dimensions as standard panel radiators and old steel or cast iron radiators. The existing connections can continue to be used and no new pipes need to be laid.  <\/p>\n<p>All you need to order is the hub distance and the bottom edge distance to the middle of the return. With these two details, the radiator can be manufactured precisely. This not only saves installation costs, but also protects the existing tiling and wall covering.  <\/p>\n<h2>Avoid typical mistakes during the inventory<\/h2>\n<p>The hub distance is often measured on the old radiator without taking into account that it may already appear slightly displaced due to rust, paint or old connectors. Therefore, measure directly at the pipe connections in the wall or on the floor and not on the radiator itself. <\/p>\n<p>Also note whether the return is connected at the top or bottom. Different dimensional references apply to side valves than to the center connection. If in doubt, a specialist company should take stock to avoid incorrect orders.  <\/p>\n<h2>Data sheets and tender documents as a planning aid<\/h2>\n<p>For professional planning, Caldo provides <a title=\"Caldo data sheets and tender documents\" href=\"https:\/\/caldo-heizkoerper.de\/en\/downloads\/\">data sheets and tender documents<\/a> for download. These contain all the necessary technical information, dimensional drawings and connection details for the Evelino renovation radiator. <\/p>\n<h2>Conclusion: Connection dimensions for bathroom radiators in renovation projects<\/h2>\n<p>Replacing an old bathroom radiator does not have to be a costly construction site. If you take careful note of the hub spacing and bottom edge distance and choose a custom-made renovation radiator, you save time, money and protect the existing building fabric. The Evelino renovation radiator from Caldo was developed precisely for this situation.  <\/p>\n<p>If you have any questions about taking measurements or product selection, please do not hesitate to contact us.  <a title=\"Contact Caldo radiators\" href=\"https:\/\/caldo-heizkoerper.de\/en\/contact\/\">Contact us now.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bathroom renovation: why dimensions are so important If you want to replace your old bathroom radiator, you quickly come up against a crucial question: what dimensions must the new radiator have so that the existing connections can still be used? If you don&#8217;t answer this question carefully, you risk expensive follow-up work, raised tiles and [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1734,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[],"class_list":["post-2348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-radiators"],"_links":{"self":[{"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/posts\/2348","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/comments?post=2348"}],"version-history":[{"count":1,"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/posts\/2348\/revisions"}],"predecessor-version":[{"id":2354,"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/posts\/2348\/revisions\/2354"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/media\/1734"}],"wp:attachment":[{"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/media?parent=2348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/categories?post=2348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caldo-heizkoerper.de\/en\/wp-json\/wp\/v2\/tags?post=2348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}