Grant Temperature & Pressure V Alve Up To 300 Lt Models Gcs0

7 bar 90 C " M parallel x 15mm compression Probe length: 97mm

Grant Temperature & Pressure Relief Valve – GCS09

Part Number: GCS09
For Unvented Cylinders up to 300 Litres
Type: Safety TPRV (Temperature & Pressure Relief Valve)

Ensure optimal safety in your unvented hot water system with the Grant GCS09 Temperature & Pressure Relief Valve, specifically designed for use with Grant cylinders up to 300 litres capacity. This essential component safeguards against excessive temperature or pressure build-up, automatically discharging water if safety thresholds are breached.

Fully compliant with G3 Building Regulations, the GCS09 TPRV combines pressure relief and thermal protection in one compact, robust valve – ideal for professional installers and competent DIY users maintaining or upgrading a Grant unvented cylinder.

Key Features

• Genuine Grant spare part – factory-fitted specification for up to 300L models

• Dual action: temperature and pressure relief for added safety

• Automatically opens at 7 bar pressure or 90–95°C temperature

• Essential for compliance with Building Regulation G3

• Built-in probe and discharge connection for direct fit

• Heavy-duty brass body for long-lasting reliability

• Ideal for routine servicing, repairs, or safety upgrades

Compatible With

• Grant unvented hot water cylinders with capacities up to 300 litres, including:

  • Grant DuoWave

  • Grant Wave

  • Other Grant models using a standard 7 bar / 90–95°C TPR valve

 If you're unsure about compatibility, our technical support team can help confirm the correct part for your setup.

When to Replace

• Signs of leakage or dripping from the discharge pipe

• Annual servicing or safety checks (as required under G3 regs)

• Corrosion, limescale, or damage to the valve body or probe

• Replacement of a faulty or seized TPR valve

• System upgrades or compliance retrofits on older cylinders

Technical Specifications

• Part Number: GCS09

• Discharge Pressure: 7 bar

• Discharge Temperature: 90–95°C

• Material: Brass body with integrated sensing probe

• Connection: 15mm compression inlet / standard discharge outlet

• Application: Domestic unvented cylinder safety device

• Certifications: Complies with G3 Building Regulations