The Wilo Z 15A is going to be replacing the Salmson SB 04-15 and Salmson NSB 04-15 circulator pump which are no longer being manufactured. Cartridges are still available for the models but in the majority of cases replacing the entire pump is the best option.
Wilo Z 15A single domestic circulator pumps:
Flow up to : 0,7 m3/h Max. service pressure: 10 bar
Min. pressure suction : 0,2 bar
Water hardness (TH) : 35 F
Heat pump hot water units
Domestic hot water
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.
Solar Hot Water Manufacturers
This product is required to be installed by a licensed trades person as per applicable legislation, and be clear that failure to do so breaches manufacturer’s warranty and may result in injury and/or death, may jeopardise applicable insurance policies or may be in breach of the relevant law. Solar Hot Water Parts recommend that Buyers check with their local authorities in regards to any specific regulations regarding licensing requirements for Plumbing or Electrical work.
Further information for Plumbing & Electrical licensing is available at:
|State or Territory
||Plumbing Licensing Information