SolarWave SWB-24LX inline white solar expansion vessel, front view
SolarWave SWB-24LX inline, three-quarter view
SolarWave SWB-24LX seen from above
SolarWave SWB-60LV vertical solar expansion vessel with base, front view
SolarWave SWB-60LV vertical with base, three-quarter view
SolarWave SWB-60LV seen from above
SolarWave SWB-8LX 8 litre inline vessel, front view
SolarWave SWB-12LX 12 litre inline vessel, front view
SolarWave SWB-18LX 18 litre inline vessel, front view
SolarWave SWB-35LX 35 litre inline vessel, front view
SolarWave SWB-80LV 80 litre vertical vessel with base, front view
SolarWave SWB-100LV 100 litre vertical vessel with base, front view

SolarWave steel solar expansion vessel by Global Water Solutions

Format
Model
Regular price€53,41
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Shipping calculated at checkout.

  • 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.

Steel solar expansion vessel for your 130 °C solar loop

The SolarWave expansion vessel from Global Water Solutions absorbs the expansion of the solar fluid and keeps the primary circuit pressure stable. Q-Tech fits it into your pre-assembled plant room, next to the solar pump station and tested in our workshop.

Summary

TypeSteel expansion vessel with fixed diaphragm
Brand and modelGlobal Water Solutions SolarWave, from SWB-8LX to SWB-100LV
UseClosed primary circuit of indirect solar thermal systems
Maximum pressure10 bar
Operating temperatureFrom −10 °C (do not freeze) to 130 °C
FormatsInline (8 to 35 L) and vertical with base (60 to 100 L)
Connection¾" BSPT male (8 to 80 L) or 1" BSPP female (100 L)
Q-Tech installationAssembled and tested in our workshop with the rest of your plant room

What is the SolarWave?

The SolarWave from Global Water Solutions is a steel expansion vessel for closed solar thermal circuits, with a fixed high-temperature butyl diaphragm. It handles 10 bar and up to 130 °C. It goes in the primary circuit, on the suction or the discharge side of the pump.

What problem does it solve?

The fluid in solar collectors expands strongly when it heats up, especially on sunny days with no hot water demand. Without a vessel to take up that volume, the pressure rises and the safety valve discharges fluid. You then have to refill the circuit and check the antifreeze.

A heating vessel cannot withstand those temperatures, and an undersized vessel causes the same discharges. The SolarWave comes from 8 to 100 litres, with a high-temperature diaphragm and a 1.9 bar factory pre-charge.

Technical data

ManufacturerGlobal Water Solutions
SeriesSolarWave
ShellSteel with dual-layer polyurethane paint, white colour
DiaphragmHigh-temperature butyl, fixed
Water connectionStainless steel, patented
Air valveCap sealed with an O-ring
BaseReplaceable on vertical models; slip-on on 60 and 80 L
Maximum working pressure10 bar
Factory pre-charge1.9 bar
Operating temperatureFrom −10 °C (avoid freezing) to 130 °C
AntifreezePropylene glycol up to 50%; the manufacturer advises avoiding ethylene glycol
QualityManufactured under ISO 9001:2015, according to the manufacturer

Models and data by variant

ModelFormatVolumeConnectionHeightDiameterGross weight
SWB-8LXInline8 L¾" BSPT308 mm202 mm2.2 kg
SWB-12LXInline12 L¾" BSPT362 mm230 mm3.0 kg
SWB-18LXInline18 L¾" BSPT362 mm279 mm3.9 kg
SWB-24LXInline24 L¾" BSPT442 mm290 mm5.1 kg
SWB-35LXInline35 L¾" BSPT476 mm318 mm6.8 kg
SWB-60LVVertical60 L¾" BSPT575 mm398 mm11.0 kg
SWB-80LVVertical80 L¾" BSPT815 mm389 mm14.3 kg
SWB-100LVVertical100 L1" BSPP850 mm430 mm19.2 kg

Compatibility and limits

  • Closed solar circuits only: the manufacturer restricts it to indirect systems with no drinking water.
  • Up to 10 bar and 130 °C; minimum −10 °C, do not freeze.
  • If the fluid can exceed its evaporation point, the manufacturer requires a heat dissipator or condenser between collector and vessel.
  • Antifreeze: propylene glycol up to 50%, never ethylene glycol.
  • Always fit a safety valve and stay within the working limits.

When this product is not the right choice

ProductWhen to choose itMaximum pressureMaximum temperature
HeatWaveClosed-loop water heating6 bar99 °C
ThermoWaveDomestic hot water (DHW), with a liner suitable for drinking water10 bar90 °C

To compare with other brands, see the Expansion vessels and pressure tanks collection.

Frequently asked questions

Is it suitable for domestic hot water?

No. The SolarWave is for the closed solar primary circuit only. For DHW, choose the ThermoWave.

What volume do I need?

It depends on the fluid volume of the system, the collectors and the maximum temperature. We help you size it in a technical call.

Which antifreeze can I use?

Propylene glycol up to 50%. The manufacturer advises always avoiding ethylene glycol.

Do I need to adjust the pre-charge?

Yes, if your system does not work at 1.9 bar. Adjust it with the vessel empty, following the manufacturer's manual linked below.

What is the delivery time?

We have it in stock at our warehouse. If no units were left, we would order it urgently and tell you the lead time.

Q-Tech installation and support

Q-Tech mounts the SolarWave in your pre-assembled plant room, tested in our workshop with the solar station and the storage tank: it reaches the site ready to connect. More information at Advanced Pre-Assembly.

If your solar system is already installed, book the on-site hourly Expert Technician or a technical call. More equipment in Expansion vessels and pressure tanks.

Documentation

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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