Fire safety system for pellet boilers

WATTS STS-20 Hot Water Safety Valve

The STS 20 safety valve is used in solid fuel boilers with a hot water heater and is designed to protect them from overheating, in accordance with DIN 4751/2, for systems with a capacity of up to 93 kW (80,000 kcal/h). The STS 20 safety valve operates independently of system pressure and opens when the hot water supply pipe reaches 95°C, draining the boiler and replacing it with cold water. This prevents the boiler temperature from exceeding 110°C.