{"product_id":"wilo-star-zrs-15-6-3","title":"Wilo Star ZRS 15\/6-3","description":"\u003cdiv class=\"tab1\" id=\"wrapper_tab\"\u003e\n    \u003cdiv class=\"clear\"\u003e \u003c\/div\u003e\n\u003cspan\u003e\u003cstrong\u003eWilo Star ZRS 15\/6-3\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tab1\"\u003e\n\u003cspan\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tab1\"\u003e\n\u003cspan\u003eWhat to consider when choosing a solar hot water circulating pump based on the pumps head:       \u003c\/span\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n            \u003cdiv\u003eThe head rating on a pump is a static rating, and applies to the maximum head in an open loop system, such as pumping up to a roof tank. In\n                the case of circulation through a roof panel and back down a return line, once the system is primed the weight of water falling down the\n                return line is equal to the weight of water in the feed line, and essentially the pump only needs to overcome the total pipe friction in\n                the system. When you take this into account the limitation is more to do with pipe length than the height. \u003c\/div\u003e\n        \u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003e\u003cspan\u003eWhen replacing the pump, it is also a good idea to replace the non return valve with an \u003c\/span\u003e\n        \u003ca href=\"https:\/\/solarhotwaterparts.com.au\/products\/avg-solar-rated-non-return-valve-hot-water\"\u003eAVG solar rated non return valve\u003c\/a\u003e\u003cspan\u003e        . Most manufacturers require the non return valve to protect the circulating pump for several reasons\u003c\/span\u003e.\n            \u003c\/p\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\n\u003chr\u003e\n\u003ch4\u003eManual \u0026amp; Documentation\u003c\/h4\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0534\/5017\/8711\/files\/pdfs_ZRS-Ku-and-NSC.pdf?v=1620435841\" target=\"_blank\" rel=\"noopener\"\u003eDownload the Wilo Star ZRS Manual (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Solar Hot Water Parts","offers":[{"title":"Default Title","offer_id":39472468164759,"sku":"SHWP1024","price":265.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0534\/5017\/8711\/files\/ZRS.jpg?v=1751243671","url":"https:\/\/solarhotwaterparts.com.au\/products\/wilo-star-zrs-15-6-3","provider":"Solar Hot Water Parts","version":"1.0","type":"link"}