{"product_id":"raypak-004674f-heat-only-exchanger","title":"Raypak 004674F Exchanger Heat-Only F-405","description":"\u003ch2\u003eRaypak 004674F Exchanger Heat-Only F-405\u003c\/h2\u003e\u003cp\u003eIf your F-405 heater is still firing but not transferring heat effectively, or you are finding internal moisture, leakage, or scale in the exchanger section, the heat exchanger is one of the first major assemblies to inspect. This is a direct repair point when a Raypak heater is not working at full output because the core heat-transfer section is failing.\u003c\/p\u003e\u003cp\u003eThis heat-only exchanger is used in the Raypak F-405 heater to transfer combustion heat into the circulating water. When the exchanger becomes restricted, worn, or starts leaking internally, the heater can still fire but will struggle to deliver usable heat. Replacing it restores the core water-side path where the heater actually does its heating work.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHeater fires but water temperature rises slowly\u003c\/li\u003e\n\u003cli\u003eInternal leaks or moisture buildup appear in the exchanger section\u003c\/li\u003e\n\u003cli\u003eScale or corrosion is found during teardown\u003c\/li\u003e\n\u003cli\u003eRaypak heater troubleshooting points to exchanger inefficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhat this part does:\u003c\/strong\u003e It transfers combustion heat into circulating water through the heater exchanger section.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for the Raypak F-405 heat-only application. Confirm with your model number before ordering.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 004674F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Exchanger\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e F-405 heat-only\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM Value:\u003c\/strong\u003e A genuine Raypak replacement part helps maintain correct fit within the header system and water path. Major exchanger repairs work best when the replacement matches the original heater configuration exactly.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.aquaterrabackyard.com\/pages\/contact-us\" target=\"_blank\"\u003e\u003cstrong\u003eNeed help confirming compatibility? Contact us ?\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.aquaterrabackyard.com\/collections\/raypak\" target=\"_blank\"\u003e\u003cstrong\u003eShop all Raypak parts ?\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Raypak","offers":[{"title":"Default Title","offer_id":51835245461778,"sku":"004674F","price":511.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/medium_d5c6550b-b392-40de-ab3b-ae13ece5a11f.jpg?v=1767391081","url":"https:\/\/www.aquaterrabackyard.com\/products\/raypak-004674f-heat-only-exchanger","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}