Wilo INTHB 15/6.7-2 Saunier Duval – Ref. 0020075437
It is the Wilo INTHB 15/6.7-2 circulator: the pump that moves the heating water in Saunier Duval boilers. It has 2 speeds and carries the code 0020075437 on the label.
- Type of part
- Saunier Duval
- Status
- Refurbished
- internal SKU
- BOM029
- Warranty
- 1 year
VAT included OUT OF STOCK
Compatible Saunier Duval boilers
Saunier Duval. Three confirmed compatibilities: Isofast Condens F35-A/1 and Isomax Condens F35-B/1. There are another 1 models that we are still verifying.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast Condens F35-A/1 | Saunier Duval | Contrasted |
| Saunier Duval Isomax Condens F35-B/1 | Saunier Duval | Contrasted |
| Saunier Duval Isofast 21 Condens F30-B/1 | Saunier Duval | Contrasted |
Models pending verification
These models are associated with this reference, but we have not finished verifying them yet, so we do not consider them compatibleIf your boiler is one of them, send us a photo of the part you are going to replace and we will verify it before you purchase.
| Saunier Duval Isofast F 28 E1 | Saunier Duval | Unconfirmed |
|---|
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 it is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Look for the motor label with model INTHB 15/6.7-2 and code 0020075437.
- Check the power: 64 W at speed I and 85 W at speed II, at 230 V and 50 Hz.
- Check the exact model on your boiler's label, including its suffix: for example, the Isomax Condens F 35 E uses a different pump. If it is an Isofast Condens F35-A/1, an Isomax Condens F35-B/1, or an Isofast 21 Condens F30-B/1, this pump has already been confirmed for it.
- If your boiler is a different model or you have questions, send us a photo of the pump label and another of the boiler's PCB from the Contact section, or call 911 17 77 77. We will compare the codes and let you know if it is your spare part.
Symptoms that require diagnosis in the Saunier Duval.
Common symptoms and faults
- 01
Cold radiators even though the boiler is on.
Cause: Check the pressure gauge to ensure the circuit has pressure and that the pump is running.
- 02
Unusual noises in the pump motor.
Cause: It could be a fault with the circulator; have it checked by a qualified technician.
- 03
The boiler locks out due to lack of circulation.
Cause: Check that the pump is receiving power and that it is rotating; if it is not rotating, have it checked by a qualified technician.
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.
Saunier Duval
- Uniclima internal SKU
- BOM029
- Brand
- Saunier Duval
- Type of part
- Saunier Duval
- Units in stock
- 0 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Commercial reference
- 4521070
- Code printed on the part label
- 0020075437
- Supply voltage
- 230 V
- Frequency
- 50 Hz
- Power at speed I
- 64 W
- Power at speed II
- 85 W
- Technical marking of the motor
- TF95
- Batch/date marking
- 12W29
- Additional labeling
- 90 1229; 401891; 006616 T7
- Verified data — Pump
- Wilo INTHB 15/6.7-2
- Verified data — Speeds
- 2
- Verified data — Speed I
- 64 W
- Verified data — Speed II
- 85 W
- Verified data — Power supply
- 230 V · 50 Hz
- Verified data — Technical marking of the motor
- TF95
- Pending applications to verify
- • Isofast F 28 E1. • Isofast Condens F35-A/1 e Isomax Condens F35-B/1 (anotadas por el almacén): las da a nivel de familia; da para esas familias otro circulador (20084525). Conflicto. • Isofast 21 Condens F30-B/1 (almacén). • Isofast Condens F 35 (sin sufijo): le asigna otra bomba (0010030644). • NO VÁLIDA para las variantes E (Isomax Condens F 35 E, Isofast F35E H-MOD, Isofast Condens F 30E): llevan la 0010030644. Consulta 24/10/2026 · 1 proveedor; pendiente de confirmar: Isofast F 28 E1. Declaración comercial para su ficha «Bomba Circuladora Wilo (INTHB15/6.7-2) 4521070», no certificación de la unidad. Confirmar referencia OEM, revisión, configuración y variante de equipo antes de usarla.
Before purchasing
- To confirm: Isofast F 28 E1 — For consultation: we have not found the code for your pump.
- Not compatible or excluded: Isomax Condens F 35 E — It uses another one: 0010030644; another one gives 280.66.0021 (discrepancy between)
- Not compatible or excluded: Isofast F 35 E H-MOD — It uses another one: 280.66.0021 (Wilo HB 15/7-3 motor)
- Not compatible or excluded: Isofast Condens F 30 E — It uses another one: 280.66.0021 (Wilo HB 15/7-3 motor)
- Do not confuse: 0010030644 (S1024000) — 50 W pump motor suitable for the Isomax Condens F 35 E — Another pump and another reference; another one suitable for that boiler is 280.66.0021.
- Do not confuse: 0020084525 — Circulator that serves as the pump motor for the Isomax Condens F 35 B (2010-2017) — Another reference: for the Isomax Condens F35-B/1 Registered confirmation: the pump 0020075437
- Do not confuse: 0010034166 — Circulator that serves as a substitute for 0020084525 and compatible with the Isomax Condens F 35-B (its page mentions the F 35 E) — Another reference: for the Isomax Condens F35-B/1 Registered confirmation: the pump 0020075437
- Do not confuse: Wilo HB15/6.7-2 — Wilo pump with a similar name, without "INT" — Similar name: compare the full name on your label (INTHB 15/6.7-2)
- Confirmed for the Isofast Condens F35-A/1, Isomax Condens F35-B/1, and Isofast 21 Condens F30-B/1.: Not confirmed: the code 0020075437 with this pump; it connects the Wilo number 4521070 with the INTHB 15/6.7-2, for the Isofast Condens and Isomax Condens families without an exact model. They provide another circulator for the Isomax Condens F 35 B: the 0020084525 (2010-2017) and the 0010034166, which replaces the 0020084525 (its page refers to the F 35 E); for the F35-B/1, please send the workshop confirmation.
Frequently asked questions: Saunier Duval
Is it suitable for my boiler?
Yes, if it is an Isofast Condens F35-A/1, an Isomax Condens F35-B/1, or an Isofast 21 Condens F30-B/1: Confirmation registered: this pump is for those three boilers. If your boiler is another model, send us a photo of the boiler's label and the pump's label from Contact, or call 911 17 77 77, and we will compare the codes.
What reference do I need to look for on my pump?
The model Wilo INTHB 15/6.7-2 and the code 0020075437. The Wilo number 4521070 is confirmed and it is provided. If your label has the same code, it is the same part.
Is it compatible with the Isofast and Isomax?
To confirm: Yes for the Isofast Condens F35-A/1, Isomax Condens F35-B/1, and Isofast 21 Condens F30-B/1: they have been confirmed. For other models, it depends on the exact model: the Isomax Condens F 35 E uses a different pump (0010030644, 280.66.0021 according to another); the Isofast F 35 E H-MOD and the Isofast Condens F 30 E use the 280.66.0021. For the Isofast F 28 E1, we have not found the code for its pump.
What are the dimensions and connections?
Without confirmation: neither the thread nor the distance between the connections of this model. Send us a photo or the measurement of your pump and we will check it before you purchase.
Is it compatible with my Isomax Condens F35-B/1 or Isofast Condens F35-A/1?
Yes. Confirmation registered: for both, this pump, the Wilo INTHB 15/6.7-2 with the code 0020075437. For the Isomax Condens F 35 B, they provide another circulator: (2010-2017) the 0020084525 and the 0010034166, which replaces the 0020084525 (their page mentions the F 35 E); for that boiler, send the workshop confirmation. Compare the code on your pump's label with the 0020075437.
What is the difference between 0020075437 and 4521070?
There are two codes for the same pump: 0020075437 is the code printed on the part's label and 4521070 is the Wilo number for the INTHB 15/6.7-2. Confirmation registered: both. The INTHB15/6.7-2 is sold as 4521070 and is provided for Isofast Condens and Isomax Condens, without indicating the model suffix; it does not mention 0020075437.
Can I install it myself?
It must be installed by a qualified technician: it is the circulator of the heating circuit and operates at 230 V · 50 Hz (64 W at speed I, 85 W at speed II). Before replacing it, check that the circuit has pressure and that the pump is receiving voltage.
What reference appears on the label?
The original PCB contains 4521070 and 0020075437, along with the model INTHB15/6.7-2.
How many speeds does it have?
The label identifies two positions: I, at 64 W, and II, at 85 W.
Wilo INTHB 15/6.7-2 Saunier Duval – Ref. 0020075437
