Saunier Duval Isotwin F24E Circulating Pump Wilo Ref. 05738300
Wilo circulator pump model ZRS15/4-1 Ku, identified by its own label. It circulates water in the circuit of Saunier Duval boilers from the Isomax and Isotwin ranges. It is replaced when the boiler does not heat properly, the pump makes noise or vibrates, does not start, or leaks water from the shaft seal. Wilo article code: 4518125.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05738300
Circulating pump with reference 05738300. Six confirmed compatibilities: Isomax C 28 E and Isomax F 28 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isomax C 28 E | Isomax | Contrasted |
| Saunier Duval Isomax F 28 E | Isomax | Contrasted |
| Saunier Duval Isomax C 28 E2 | Isomax | Contrasted |
| Saunier Duval Isotwin C 24 E | Isotwin | Contrasted |
| Saunier Duval Isotwin F 24 E | Isotwin | Contrasted |
| Saunier Duval Isotwin F 28 E2 | Isotwin | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if ref. 05738300 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 05738300. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the circulator pump 05738300 resolves.
The circulation pump circulates the water in the heating circuit. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler takes a long time to provide hot water or does not heat the radiators properly.
Cause: If the pump does not move the necessary flow, the heat generated is not distributed as quickly as it should be through the circuit.
Bleed the highest radiator in the system before considering replacing the pump.
- 02
There is noticeable noise, buzzing, or vibration in the area of the pump when the boiler is operating.
Cause: A worn bearing or trapped air causes the rotor to not spin smoothly and transmits that noise to the casing.
Check the circuit pressure on the manometer; low pressure promotes air in the pump and can be mistaken for a fault in the rotor.
- 03
The pump does not start even though the boiler is requesting heat and the rest ignites normally.
Cause: The shaft may be seized due to scale or the motor winding may have failed, so it does not rotate despite receiving a start command.
With the boiler turned off and unplugged, try to turn the shaft by hand through the front slot of the motor; if it doesn't budge, confirm the blockage before replacing it.
- 04
There is a drip or water leak right below the pump, at the joint with the body.
Cause: The mechanical seal of the shaft loses tightness due to wear and allows a slow and constant leak.
Dry the area and check after a few hours of operation if the dripping reappears right there and not from a nearby fitting or bleed valve.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 11 | Pump blocked. | If the sanitary pump 05738300 seizes or fails electrically during the DHW recharge, the electronics detect circulator blockage and trigger "11". Verification: force DHW demand, check 230 V and current in the pump, and release/inspect the shaft from the front cap. |
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Data sheet for the Saunier Duval 05738300 circulation pump.
- Catalogue reference
- 05738300
- Brand
- Saunier Duval
- Type of part
- Pumps
- Units in stock
- 1 unit
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Manufacturer
- Wilo
- Model
- ZRS15/4-1 Ku
- Item code
- 4518125
- Voltage
- ~230V 50Hz
- Condenser
- 2 µF - 400VDB
- Current
- 0.31 A
- Absorbed power
- 71 W
- Speed
- 2100 min-1
- Degree of protection
- IP44
- Thermal class
- Class F - TF85
Frequently asked questions about the circulator pump 05738300
Is this Wilo ZRS15/4-1 Ku pump compatible with the Saunier Duval Isotwin F24E?
What manufacturer is the pump of the Isotwin F24E?
What is the article code for this Wilo pump for the Isomax C28E?
Why is the pump of the Isotwin/Isomax replaced?
Spare parts related to Saunier Duval Isomax
