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
- Global Water Solutions vessel installation manual (multilingual, includes English)
- HeatWave page on the manufacturer's website
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.