The Wilo Star Z Nova solar hot water pump is the current replacement for the discontinued Salmson SB 04-15 and NSB 04-15 circulation pumps used in many Australian systems.
If your solar hot water system is not circulating properly, making noise, or failing to heat efficiently, this pump provides a reliable and energy-efficient replacement designed for long-term performance.
Trusted replacement used across thousands of Australian solar hot water systems.
What is the difference between Salmson and Wilo pumps?
Salmson pumps are the older models that were widely used in solar hot water systems. These have now been discontinued and replaced by Wilo pumps, which are the updated versions offering improved efficiency, reliability and modern design.
The Wilo Star Z Nova is one of the most commonly used solar hot water circulation pump replacements in Australia.
Yes, the Wilo Star Z Nova is widely used as a replacement for the discontinued Salmson SB 04-15 and earlier models. It is suitable for most systems that previously used these pumps.
The Wilo Star Z Nova is compatible with many Australian solar hot water systems including Rheem, Dux, Apricus, Hills and Solahart. If unsure, contact us to confirm suitability.
In most cases, replacing the entire pump is more reliable than replacing internal components, especially for older or discontinued models.
Installation by a licensed plumber or qualified technician is recommended to ensure safe and correct operation.
Pump for pipe installation, blocking-current proof synchronous motor with high starting torque. Brass pump housing, Noryl impeller, ceramic shaft.
Power consumption of 3 – 5 W.
Equipped with thermal insulation shell as standard, housing thread Rp ½.
| Hydraulic data | |
|---|---|
| Maximum operating pressure PN | 10 bar |
| Delivery head for Qmin H Qmin | 1.0 m |
| Max. volume flow Qmax | 0.4 m³/h |
| Min. fluid temperature Tmin | 2 °C |
| Max. fluid temperature Tmax | 95 °C |
| Min. ambient temperature Tmin | 2 °C |
| Max. ambient temperature Tmax | 40 °C |
| Max. permitted total water hardness | 3.57 mmol/l (20°dH) |
| Motor data | |
|---|---|
| Mains connection | 1~230 V, 50 Hz |
| Rated power P2 | 5 W |
| Rated current IN | 0.05 A |
| Max. speed nmax | 3000 1/min |
| Power consumption P1 min | 3 W |
| Power consumption P1 max | 5 W |
| Interference emission | EN 61000-6-3 |
| Interference immunity | EN 61000-6-2 |
| Protection class motor | IP42 |
| Insulation class | F |
| Threaded cable connection | 1 x PG11 |
| Motor protection | no |
| Materials | |
|---|---|
| Pump housing | Brass |
| Impeller | PPE/PS-GF30 |
| Shaft | Ceramic |
| Bearing | Carbon, synthetic resin-impregnated |
| Installation dimensions | |
|---|---|
| Thread | G 1 |
| Pipe connection on the suction side DNs | Rp ½ |
| Pipe connection on the discharge side DNd | Rp ½ |
| Port-to-port length L0 | 84 mm |
| Installation dimensions | |
|---|---|
| Thread | G 1 |
| Pipe connection on the suction side DNs | Rp ½ |
| Pipe connection on the discharge side DNd | Rp ½ |
| Port-to-port length L0 | 84 mm |
| Fluid media | Water 100 % |
| Fluid temperature T | 20.00 °C |
| speed at duty point n hydr. @ OP | 2900 1/min |
