AVG Hot Water Expansion PTR Valve 15mm Blue 850KPA Compatible_Thermann a Pressure Limiting Valve must

a Pressure Limiting Valve must be fitted to the cold inlet

3 speed asynchronous circulator

If you find moisture

For the connection of the mains and SSM lines

AVG Hot Water Expansion PTR Valve 15mm Blue 850KPA Compatible_Thermann a Pressure Limiting Valve mustHot Water Expansion PTR Valve 15mm Blue 850KPA The Pressure and Temperature Relief valve (PTR) is designed to relieve the increase in pressure caused by water expansion during the normal heating cycle. The valve will then relieve the increase in pressure by releasing drips of hot water to the drain line. Should the electrical temperature cut out device cease to operate correctly, the water will overheat. The temperature probe will then open the PTR