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</html><thumbnail_url>https://installateurszaken.nl/wp-content/uploads/2026/09/Afb.-II-1.jpg</thumbnail_url><thumbnail_width>1500</thumbnail_width><thumbnail_height>2000</thumbnail_height><description>Een bestaande convectorput combineren met een warmtepomp ligt niet direct voor de hand, omdat bij lagere watertemperaturen de warmteafgifte en natuurlijke luchtstroming sterk afnemen. Technicus Barend Kloppenburg bedacht een retrofitoplossing die een traditionele convector actief laat ventileren. Kloppenburg schat dat dit concept toepasbaar is in ongeveer 135.000 bestaande woningen die nog moeten worden verduurzaamd, maar [&hellip;]</description></oembed>
