Baxi SB-4X compact brass DHW recirculation circulator, side view

Baxi SB-4X compact brass DHW recirculation circulator

Regular price€233,22
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  • 4 in stock
  • Backordered, shipping soon

At Q-TECH, we apply the same clear rules for everyone: the law protects you, and when applied correctly, it protects us as well. By processing your purchase, you accept our General Terms and Conditions of Sale. If you are purchasing as a consumer (B2C), nothing stated herein limits the rights granted to you by mandatory law (RDL 1/2007, TRLGDCU): the 3-year legal warranty of conformity and the right of withdrawal under the terms and with the exceptions legally provided, which are detailed below. References to "B2B" apply only to businesses and professionals.

Your guarantees

  • Rights intact: 14 days of withdrawal from receipt for most products—subject to the legal exceptions you will see below, such as goods made to your specifications—and a 3-year legal warranty of conformity, under the terms of the TRLGDCU.
  • Conformity with the description: we guarantee that the equipment will correspond to the published technical description and what one could reasonably expect from it (arts. 115 et seq. TRLGDCU). Images and videos are for guidance only: the manufacturer may supply a more recent revision of the product or introduce minor aesthetic, packaging, or firmware changes, without this constituting a lack of conformity as long as the described characteristics and performance are maintained.
  • Traceability that also protects you: we document the condition, serial number, and seal of each piece of equipment upon shipment, and we video-record the opening of returns; this is your proof of the condition in which the goods were delivered.

Responsible use and your part

  • If you are thinking of returning it, keep it as you received it: without installing or activating it, with its seals, accessories, and packaging intact. This is how to ensure a full refund, without deductions.
  • Handling that exceeds inspection reduces value: handling the equipment beyond what is necessary to verify its nature and operation may result in a real, assessed, and case-by-case justified deduction (art. 108.2 TRLGDCU), never a fixed percentage. In particular: activating or registering the serial number, linking it to a manufacturer's account or app, circulating water through hydraulic equipment, unsealing probes, or installing software or consumables. Initial inspection of the product does not lead to a deduction.
  • The same item must be returned: withdrawal requires returning the supplied unit. Different equipment, or equipment with prior use, age, or wear prior to purchase, does not constitute a valid withdrawal.
  • Installation and cybersecurity, shared responsibility: this is technical hardware; you are responsible for correct installation, credentials, patches, and backups, while we deliver a compliant product. Q-TECH is not liable for damages resulting from poor installation, incorrect configuration, or omission of patches by the customer or third parties (in B2C, without prejudice to the legal warranty and liability for intent or negligence, arts. 86 and 130 TRLGDCU).
  • Delivery of bulky goods: delivery is made to the curb. B2C: transport risk is ours until physical delivery (art. 66 ter); we recommend noting visible damages on the delivery note and notifying us of breakages within 24-48 hours with photographs to activate the insurance. B2B: inspection and notation on the delivery note are mandatory; hidden damages must be reported within 24 hours (art. 366 CCom). Unjustified rejection or incorrect shipping information will entail the actual outbound and return costs (approx. €85-550 for heavy machinery).

Made to your measure (Advanced Pre-Assembly)

  • If your order includes equipment, racks, hydraulic assemblies, or technical rooms made or configured according to your specifications (permanent joints, custom cuts or wiring, parameterization, pressure testing), these are custom goods without the right of withdrawal from the conclusion of the contract (art. 103.c TRLGDCU; CJEU Case C-529/19), which is informed before purchasing and documented in the signed Order Note. A test you request without permanent modification retains your right of withdrawal, with only the actual loss of value caused by that test being deducted. Would you prefer to receive it tested, configured, and ready to connect, without assuming these risks? Contract our Advanced Pre-Assembly or the prior technical audit.

If you are purchasing as a business or professional (B2B)

  • The transaction is governed by the Commercial Code: firm sale, without the right of withdrawal; notification of defects within 4 days (apparent) / 30 days (hidden), arts. 336 and 342. Q-TECH acts as a distributor and excludes indirect damages, loss of profit, and data loss, limited to the price of the equipment, without prejudice to the manufacturer's commercial warranty.

Product warnings v1.0 · June 2026. Information summary; the complete and binding conditions are those published at q-tech.es.

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Compact Baxi circulator for hot water recirculation in small loops

The Baxi SB-4X is Baxi's compact circulator for domestic hot water recirculation in small systems: brass body, canned rotor motor and a consumption of only 5 W. Q-Tech integrates it into its pre-assembled plant room, built and tested in the workshop together with the cylinder and the return valves, so that only the final connection is left on site.

Summary

TypeCompact canned rotor circulator for DHW recirculation
Brand and modelBaxi SB-4X (reference 7720450)
UseDomestic hot water recirculation loops in homes and small systems, drinking water only
Maximum head1 m (Baxi catalogue curve)
Power input5 W (4 to 6 W depending on the operating point)
ConnectionR ½ with unions, with pre-fitted shut-off valve and check valve
Power supplySingle-phase 230 V
Q-Tech installationIntegrated into a pre-assembled plant room or installed by an on-site Expert Technician (Pre-Montaje Avanzado)

What is the Baxi SB-4X?

The Baxi SB-4X is a compact Baxi circulator for domestic hot water recirculation circuits, with a brass pump body and a 5 W canned rotor motor. It keeps the water moving around the return loop. It is installed after the draw-off points.

What problem does it solve?

In a home or a small system without recirculation, the water cools down in the pipe and the user waits with the tap open until it runs hot. The SB-4X keeps the water moving around the return loop, so hot water reaches the tap sooner, with very low power consumption.

An oversized circulator in a small loop uses more energy and makes more noise; an undersized one does not reach the last tap. Q-Tech checks the length and flow of the loop before choosing between the SB-4X and the SB Series.

Technical data

Maximum operating pressure10 bar
Maximum operating temperature65 °C (up to 70 °C for short periods of 2 hours)
Maximum ambient temperature40 °C
Power supplySingle-phase 230 V
Rated current0.05 A
Power input5 W (4 to 6 W)
Speed3,000 rpm, single speed
Maximum head1 m, according to the Baxi catalogue curve
Pipe connectionR ½, with unions; pre-fitted shut-off valve and check valve
Maximum water hardness36 °f (Baxi manual)
MotorCanned rotor, quiet operation
Pump bodyCorrosion-resistant brass; insulating casing
Electrical protectionIP 42
Weight1.3 kg
Baxi reference7720450

Compatibility and limits

  • Drinking water only, in domestic hot water recirculation circuits up to 10 bar and 65 °C.
  • Maximum water hardness of 36 °f according to Baxi's manual; harder water should be treated first.
  • Designed for small loops: its maximum head is 1 m.
  • Fitted on the loop return, after the draw-off points, with an R ½ union connection.
  • Plant room ambient temperature up to 40 °C.
  • It is not a heating circulator.

When this product is not the right choice

  • If the loop is long or serves a building, it needs more flow and head: the Baxi SB Series reaches up to 9.5 m³ per hour and 9 m.
  • If the circuit is for heating rather than domestic hot water, Baxi offers the high-efficiency Quantum MAXI range.
  • If the water is harder than the maximum, water treatment is needed first.
  • If you are looking for electronic control or time programming, the SB-4X runs at a fixed speed; see the recirculation pumps collection.

Frequently asked questions

What system is the SB-4X for?

For small domestic hot water recirculation loops, such as those in a home or a shop. For larger loops, the SB Series.

Where is it installed?

On the return of the hot water loop, after the draw-off points. It has an R ½ connection with a pre-fitted shut-off valve and check valve.

How much power does it use?

About 5 W, between 4 and 6 W depending on the operating point.

Is it noisy?

Baxi describes it as quiet: it has a canned rotor and no fan.

What is the delivery time?

We have it in stock at our warehouse; if no units are left when you order, we order it urgently and inform you of the updated lead time.

Can I install it myself?

Baxi states that it must be installed by qualified personnel. Q-Tech can integrate it into its plant room or install it on your site.

Q-Tech installation and support

With the pre-assembled plant room, Q-Tech fits the SB-4X in its workshop with the cylinder, valves and controls, and delivers it tested and ready to connect: only the final connection is left on site. More information on Pre-Montaje Avanzado and the workshop pre-assembly service.

If the system already exists, an on-site hourly Expert Technician replaces or integrates the circulator. To choose between the SB-4X and the SB Series with your loop data, you can book a technical call (a paid service). See also the recirculation pumps collection or message us on WhatsApp.

Documentation

SB Series and SB-4X on baxi.es: installation manual, declaration of conformity and price catalogue (in Spanish)

Availability and lead times: this item is in stock at our warehouse. Occasionally, depending on the time of year, the stock update may contain an error. If no units are available when you place your order, we will order it urgently and inform you immediately of the updated delivery time.

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