Wilo Star ZRS 15/4-3 OEM Circulating Pump
This Product Has Been Discontinued
The Wilo Star ZRS 15/4-3 OEM Circulating Pump has now been discontinued and is no longer available for purchase.
This page has been retained as a reference to help customers identify older systems and find technical information.
If you are looking for a replacement for this pump, please contact our team. We will help you identify the most suitable current alternative for your solar hot water system.
What to consider when choosing a solar hot water circulating pump based on the pumps head:
-
The 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 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 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 the system. When you take this into account the limitation is more to do with pipe length than the height.
When replacing the pump, it is also a good idea to replace the non return valve with an AVG solar rated non return valve . Most manufacturers require the non return valve to protect the circulating pump for several reasons.