HeatWave HWB-24LX inline grey heating expansion vessel, front view
HeatWave HWB-24LX inline, three-quarter view
HeatWave HWB-24LX seen from above
HeatWave HWB-60LV vertical with base, heating expansion vessel, front view
HeatWave HWB-60LV vertical with base, three-quarter view
HeatWave HWB-60LV seen from above
HeatWave HWB-2LX 2-litre inline, front view
HeatWave HWB-8LX 8-litre inline, front view
HeatWave HWB-12LX 12-litre inline, front view
HeatWave HWB-18LX 18-litre inline, front view
HeatWave HWB-35LX 35-litre inline, front view
HeatWave HWB-80LV 80-litre vertical with base, front view
HeatWave HWB-100LV 100-litre vertical with base, front view
HeatWave HWB-150LV 150-litre vertical with base, front view

HeatWave steel heating expansion vessel by Global Water Solutions

Format
Model
Regular price€21,24
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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.

6 bar steel expansion vessel for your heating circuit

The Global Water Solutions HeatWave expansion vessel absorbs the expansion of water in your heating system and keeps pressure within safe limits. Q-Tech integrates it into your pre-assembled plant room, connected and tested in our workshop together with the boiler or heat pump.

Summary

Type Steel expansion vessel with fixed diaphragm
Brand and model Global Water Solutions HeatWave, from HWB-2LX to HWB-150LV
Use Closed-loop hydronic heating circuits, non-potable
Maximum pressure 6 bar
Operating temperature From −10 °C (no freezing) to 99 °C
Formats Inline (2 to 35 L) and vertical with base (60 to 150 L)
Connection ¾" BSPT (2 to 80 L) or 1" BSPP (100 and 150 L)
Q-Tech installation Integrated and tested in our workshop within your plant room

What is the HeatWave?

The Global Water Solutions HeatWave is a steel expansion vessel for closed-loop heating circuits, with a fixed butyl diaphragm that separates the water from the pre-charged air. It is rated for 6 bar and up to 99 °C. Inline models hang from the pipework; vertical models stand on their base.

What problem does it solve?

As heating water warms up, its volume increases. Without a vessel to absorb that expansion, pressure rises and the safety valve opens. Each discharge means refilling the circuit with fresh water.

An undersized vessel or the wrong pre-charge causes the same discharges. The HeatWave is made from 2 to 150 litres, with a factory pre-charge set for each size.

Technical data

Manufacturer Global Water Solutions
Series HeatWave
Shell Steel with two-layer polyurethane paint, grey, for indoor and outdoor use
Diaphragm High-grade butyl, fixed
Water connection Patented, with hex nut for easy fitting
Air valve Brass, with O-ring sealed cap
Maximum working pressure 6 bar
Factory pre-charge 0.7 bar (2 to 24 L), 1 bar (35 L) and 1.5 bar (60 to 150 L)
Operating temperature From −10 °C (avoid freezing) to 99 °C
Glycol Propylene glycol up to 50%; the manufacturer advises against ethylene glycol
Quality Manufactured under ISO 9001:2015, according to the manufacturer

Models and data by variant

Model Format Volume Connection Height Diameter Gross weight
HWB-2LX Inline 2 L ¾" BSPT 204 mm 126 mm 1.1 kg
HWB-8LX Inline 8 L ¾" BSPT 308 mm 202 mm 2.0 kg
HWB-12LX Inline 12 L ¾" BSPT 362 mm 230 mm 2.8 kg
HWB-18LX Inline 18 L ¾" BSPT 362 mm 279 mm 3.5 kg
HWB-24LX Inline 24 L ¾" BSPT 442 mm 290 mm 4.4 kg
HWB-35LX Inline 35 L ¾" BSPT 476 mm 318 mm 6.8 kg
HWB-60LV Vertical 60 L ¾" BSPT 575 mm 398 mm 10.5 kg
HWB-80LV Vertical 80 L ¾" BSPT 815 mm 389 mm 14.3 kg
HWB-100LV Vertical 100 L 1" BSPP 805 mm 430 mm 19.5 kg
HWB-150LV Vertical 150 L 1" BSPP 938 mm 530 mm 34.0 kg

Compatibility and limits

  • Closed heating circuits only: the manufacturer excludes potable water and circuits with frequent make-up water.
  • Up to 6 bar and 99 °C; minimum −10 °C, without freezing.
  • Antifreeze: propylene glycol up to 50%, never ethylene glycol.
  • Inline models are supported by the pipework or a wall bracket, sold separately.

When this product is not the right choice

Product When to choose it Maximum pressure Maximum temperature
ThermoWave Domestic hot water (DHW), with a liner suitable for potable water 10 bar 90 °C
SolarWave Solar thermal circuits 10 bar 130 °C
PressureWave Cold water booster pump sets 10 bar 90 °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 HeatWave is for closed-loop heating only. For DHW, choose the ThermoWave.

Which volume do I need?

It depends on the water volume of your installation and its maximum temperature. We can help you size it in a technical call.

Do I need to adjust the pre-charge?

Yes, if your installation does not match the factory setting. Adjust it with the vessel empty, following the manufacturer's manual linked below.

Can it be installed outdoors?

Yes. The manufacturer states that its two-layer paint is suitable for indoor and outdoor use. Always avoid freezing.

What is the delivery time?

We have it in stock at our warehouse. If none were left, we would order it urgently and tell you the lead time.

Q-Tech installation and support

Q-Tech integrates the HeatWave into your pre-assembled plant room, tested in our workshop with the boiler or heat pump: it arrives on site ready to connect. More information on Advanced Pre-Assembly.

If your installation is already in place, 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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