10 bar expansion vessel for your domestic hot water
The Global Water Solutions ThermoWave expansion vessel absorbs the expansion of domestic hot water and stops the safety valve from discharging water. Q-Tech integrates it into your pre-assembled plant room, connected and tested in our workshop together with the cylinder or heat pump.
Summary
| Type | Steel expansion vessel with fixed diaphragm and polypropylene liner |
|---|---|
| Brand and model | Global Water Solutions ThermoWave, from TWB-2LX to TWB-60LV |
| Use | Domestic hot water (DHW) in homes and light commercial buildings |
| Maximum pressure | 10 bar |
| Maximum temperature | 90 °C |
| Formats | Inline (2 to 35 L) and vertical with base (60 L) |
| Connection | ¾" BSPT stainless steel |
| Q-Tech installation | Integrated and tested in our workshop within your plant room |
What is the ThermoWave?
The Global Water Solutions ThermoWave is a steel expansion vessel for domestic hot water. The water only touches a virgin polypropylene liner and the butyl diaphragm, never the steel. It is rated for 10 bar and up to 90 °C.
What problem does it solve?
As the water in the water heater or cylinder heats up, its volume increases and pressure rises. Without a vessel, the safety valve discharges hot water, wasting both water and energy.
A heating vessel is not suitable here, because the water would touch the steel. The ThermoWave is made from 2 to 60 litres, with the water kept away from the metal.
Technical data
| Manufacturer | Global Water Solutions |
|---|---|
| Series | ThermoWave |
| Shell | Steel with two-layer polyurethane paint, almond colour |
| Diaphragm | High-grade butyl, fixed |
| Liner | Virgin polypropylene |
| Water connection | Stainless steel, patented, ¾" BSPT |
| Air valve | O-ring sealed cap |
| Maximum working pressure | 10 bar |
| Factory pre-charge | 1.9 bar |
| Maximum working temperature | 90 °C |
| Quality | Manufactured under ISO 9001, according to the manufacturer |
Models and data by variant
| Model | Format | Volume | Connection | Height | Diameter | Gross weight |
|---|---|---|---|---|---|---|
| TWB-2LX | Inline | 2 L | ¾" BSPT | 206 mm | 126 mm | 1.2 kg |
| TWB-4LX | Inline | 4 L | ¾" BSPT | 258 mm | 162 mm | 1.6 kg |
| TWB-8LX | Inline | 8 L | ¾" BSPT | 310 mm | 202 mm | 2.3 kg |
| TWB-12LX | Inline | 12 L | ¾" BSPT | 364 mm | 230 mm | 3.1 kg |
| TWB-18LX | Inline | 18 L | ¾" BSPT | 364 mm | 279 mm | 4.0 kg |
| TWB-24LX | Inline | 24 L | ¾" BSPT | 444 mm | 290 mm | 5.3 kg |
| TWB-35LX | Inline | 35 L | ¾" BSPT | 478 mm | 318 mm | 7.1 kg |
| TWB-60LV | Vertical | 60 L | ¾" BSPT | 619 mm | 398 mm | 11.6 kg |
Compatibility and limits
- Suitable for potable water: the water does not touch the steel thanks to the polypropylene liner.
- Up to 10 bar and 90 °C, according to the manufacturer.
- Pre-charge is set to the cold water inlet pressure, with the vessel empty.
- Inline models are supported by the pipework or a wall bracket, sold separately; the vertical model stands on its base.
When this product is not the right choice
| Product | When to choose it | Maximum pressure | Maximum temperature |
|---|---|---|---|
| HeatWave | Closed-loop heating circuits | 6 bar | 99 °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
Can it be used for heating?
It can, but for closed-loop heating the dedicated option is the HeatWave.
Which volume do I need?
It depends on the cylinder volume, the water temperature and the mains pressure. We can help you size it in a technical call.
Do I need to adjust the pre-charge?
Yes. Set it to the cold water inlet pressure, with the vessel empty, following the manufacturer's manual linked below.
Where is it installed?
On the cold water inlet of the water heater or cylinder, following the manufacturer's manual.
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 ThermoWave into your pre-assembled plant room, tested in our workshop with the cylinder 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)
- ThermoWave 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.