Zilmet CAL-PRO Heating Expansion Vessels

The Zilmet Cal-Pro Expansion Vessel is a robust, maintenance-free solution designed to manage thermal expansion in closed-loop heating systems. By absorbing excess pressure caused by heated water, it protects boilers, pipes, and radiators from damage, ensuring efficient and reliable operation.

Key Specifications

• Capacity Range: 8–35 litres (suitable for small domestic to light commercial systems).

• Maximum Working Pressure: 10 bar / 145 psi.

• Factory Pre-Charge Pressure: 1.5 bar / 22 psi (adjustable for system requirements).

• Maximum Temperature: 100°C / 212°F.

• Connection Size: 1" BSP female thread (standard for UK heating systems).

• Diaphragm Material: High-grade nitrile rubber (resistant to wear and corrosion).

• Shell Material: Carbon steel with epoxy-coated finish for durability.

Features & Benefits

• Pressure Stabilisation: Prevents pressure spikes in heating systems, extending equipment lifespan.

• Compact Design: Space-saving and easy to install in boiler rooms or compact spaces.

• Adjustable Pre-Charge: Customisable to match system static pressure.

• Corrosion-Resistant: Epoxy coating protects against rust in damp environments.

• Compliance: Meets UK and EU standards for heating system components.

Typical Applications

• Domestic and commercial boiler systems.

• Underfloor heating circuits.

• Solar thermal installations.

Installation Notes

• Mount vertically to optimise diaphragm performance.

• Ensure pre-charge pressure matches system static pressure before installation.

• Consult a Gas Safe registered engineer for compliance with UK building regulations.

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

Standard Delivery

UK Mainland 

• Delivery Time: 2–3 working days
• Free Delivery for orders over £50
• Delivery fee of £5.99 for orders under £50

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

Express Delivery

UK Mainland

• Delivery Time: 1–2 working days
• Free Delivery for orders over £50
• Delivery fee of £9.95 for orders under £50

Same Day Delivery

Greater London 

• 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