GWS Potable Expansion Vessels for Hot Water Cylinders

Specially designed for potable water heating systems, ThermoWave™ expansion tanks are ideal for domestic and light commercial applications, providing reliable hot water for washing, cooking, showering and more.

Traditional water heating systems depend on relief valves to release excess pressure, a process that wastes both water and energy. In contrast, ThermoWave™ tanks absorb expanded water volume efficiently, preventing unnecessary discharge. Crafted with high-grade butyl diaphragms and virgin polypropylene liners, these tanks guarantee the safety and hygiene of your potable water supply.

The carbon steel shell, coated with dual-layer polyurethane paint, offers excellent corrosion resistance, ensuring long-term durability.

Features & Benefits

• High-grade butyl diaphragm

• Virgin polypropylene liner

• Two-part polyurethane epoxy-primed paint finish

• Patented stainless steel connection

• Leak-free, O-ring-sealed air valve cap

• Maintenance-free operation

Engineered to conserve resources and enhance efficiency, ThermoWave™ expansion tanks deliver superior performance for modern water heating needs.

Product details:

• Capacity: 2 – 24 litres

• Maximum Working Pressure: 10 bar

• Factory Pre-charge: 1.9 bar

• Maximum Operating Temperature: 90°C

• Connection: 3/4" BSP M

• For Potable Water

Please note: Delivery times may vary depending on location, with specific details outlined below.

Standard Delivery

UK Mainland 

• Delivery Time: 2–4 working days
• Free Delivery on all orders

Express Delivery

UK Mainland

• Delivery Time: 1–3 working days
• Delivery fee of £15

Channel Islands

• Postcodes Covered: GY*, IM*, JE* 
• Minimum Order: £50
• Delivery Fee: £70

Northern Ireland, Offshore Territories & Scottish Islands 

• Postcodes Covered: BT*, HS*, KW, ZE
• Minimum Order: £50
• Delivery Fee: £35

Same Day Delivery 

• Eligible Postcodes:
  E*, EC*, N*, NW*, SE*, SW*, W*, WC*, HA*, UB*, EN*, IG*, RM*, KT*, SM*, CR*, BR*, DA*, TW*
• Minimum Order: £50
• Same Day Delivery Fee: £60
• Special Requests or Locations:
  For areas outside these postcodes or urgent quotes, please email orders@qualityheating.co.uk and we’ll do our best to accommodate.

Collections

Want to collect your order instead?You’re welcome to do so — just email us at orders@qualityheating.co.uk or message us via WhatsApp with your preferred collection time, and we’ll confirm the details.

Collection address: 284 Water Rd, Unit 9, London, HA0 1HX